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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Public Health</journal-id>
<journal-title>Frontiers in Public Health</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Public Health</abbrev-journal-title>
<issn pub-type="epub">2296-2565</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fpubh.2024.1402780</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Public Health</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Vigorous physical activity and weight status in school-aged children: a cross-sectional study</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" corresp="yes">
<name><surname>Yu</surname> <given-names>Weijun</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>&#x002A;</sup></xref>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
<role content-type="https://credit.niso.org/contributor-roles/data-curation/"/>
<role content-type="https://credit.niso.org/contributor-roles/methodology/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Xu</surname> <given-names>Shuanglu</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<role content-type="https://credit.niso.org/contributor-roles/data-curation/"/>
<role content-type="https://credit.niso.org/contributor-roles/formal-analysis/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Dai</surname> <given-names>Xiaojie</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<role content-type="https://credit.niso.org/contributor-roles/data-curation/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Fan</surname> <given-names>Huiying</given-names></name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/1651976/overview"/>
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<role content-type="https://credit.niso.org/contributor-roles/software/"/>
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<aff id="aff1"><sup>1</sup><institution>Faculty of Sport, College of Teacher Education, Taizhou University</institution>, <addr-line>Taizhou</addr-line>, <country>China</country></aff>
<aff id="aff2"><sup>2</sup><institution>School of Physical Education, Shanghai Normal University</institution>, <addr-line>Shanghai</addr-line>, <country>China</country></aff>
<author-notes>
<fn fn-type="edited-by" id="fn0002"><p>Edited by: Om Kurmi, Coventry University, United Kingdom</p></fn>
<fn fn-type="edited-by" id="fn0003"><p>Reviewed by: Vanilson Batista Lemes, State Department of Education, Brazil</p><p>Olivier Gavarry, Universit&#x00E9; de Toulon, France</p><p>Luis Manuel Rama, University of Coimbra, Portugal</p></fn>
<corresp id="c001">&#x002A;Correspondence: Weijun Yu, <email>yuweijun2009@163.com</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>12</day>
<month>06</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>12</volume>
<elocation-id>1402780</elocation-id>
<history>
<date date-type="received">
<day>18</day>
<month>03</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>20</day>
<month>05</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x00A9; 2024 Yu, Xu, Dai and Fan.</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Yu, Xu, Dai and Fan</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<sec id="sec1">
<title>Aim</title>
<p>To explore the association between VPA and weight status in adolescents.</p>
</sec>
<sec id="sec2">
<title>Methods</title>
<p>The 2017/2018 Health Behavior in School-aged Children survey (HBSC) targeted children and adolescents aged 11, 13 and 15. A systematic multistage stratified cluster randomized sampling method was used in each participating country. The 2017/2018 survey enrolled over 240,951 adolescents across 45 countries and regions. Frequency of VPA, weight status and confounding factors were collected using a self-reported questionnaire.</p>
</sec>
<sec id="sec3">
<title>Results</title>
<p>Compared to daily VPA, less frequent VPA was linked to higher odds of obesity. For example, those who participating in VPA for 4&#x2013;6 times a week (OR&#x2009;=&#x2009;1.10, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.13), 2&#x2013;3 times a week (OR&#x2009;=&#x2009;1.21, 95% CI&#x2009;=&#x2009;1.17&#x2013;1.25), or once a week (OR&#x2009;=&#x2009;1.21, 95% CI&#x2009;=&#x2009;1.16&#x2013;1.25) all have higher odds of abnormal weight status. For boys, the frequency of 4&#x2013;6 times a week (OR&#x2009;=&#x2009;1.09, 95% CI&#x2009;=&#x2009;1.04&#x2013;1.13), 2&#x2013;3 times a week (OR&#x2009;=&#x2009;1.22, 95% CI&#x2009;=&#x2009;1.17&#x2013;1.27), or once a week (OR&#x2009;=&#x2009;1.25, 95% CI&#x2009;=&#x2009;1.19&#x2013;1.32) were associated with higher odds of abnormal weight status. For girls, those who participating in VPA 4&#x2013;6 times a week (OR&#x2009;=&#x2009;1.11, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.16), 2&#x2013;3 times a week (OR&#x2009;=&#x2009;1.20, 95% CI&#x2009;=&#x2009;1.14&#x2013;1.25), or once a week (OR&#x2009;=&#x2009;1.17, 95% CI&#x2009;=&#x2009;1.11&#x2013;1.23) all have higher odds of abnormal weight status (i.e., overweight or obesity).</p>
</sec>
<sec id="sec4">
<title>Conclusion</title>
<p>This population-based study suggests that infrequent VPA participation is associated with unhealthy weight status in adolescents compared to their physically active counterparts. Additionally, this association remains consistent in both boys and girls.</p>
</sec>
</abstract>
<kwd-group>
<kwd>vigorous physical activity</kwd>
<kwd>weight status</kwd>
<kwd>school-aged children</kwd>
<kwd>cross-sectional study</kwd>
<kwd>association</kwd>
</kwd-group>
<counts>
<fig-count count="0"/>
<table-count count="4"/>
<equation-count count="0"/>
<ref-count count="38"/>
<page-count count="8"/>
<word-count count="5892"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Children and Health</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="sec5">
<label>1</label>
<title>Introduction</title>
<p>In recent decades, there has been a continuous rise in the prevalence of obesity among children and adolescents (<xref ref-type="bibr" rid="ref1">1</xref>, <xref ref-type="bibr" rid="ref2">2</xref>). Data sourced from the World Health Organization (WHO) underscores a significant rise in obesity among children and adolescents, with rates surging from 4% in 1975 to 18% in 2016 (<xref ref-type="bibr" rid="ref3">3</xref>). In this regard, the high prevalence of obesity has raised public concerns, given its position as the sixth most significant risk factor, it plays a substantial role in the collective disease burden (<xref ref-type="bibr" rid="ref4">4</xref>). Obesity significantly affects the physical and mental health of young individuals, representing a critical risk factor for their overall quality of life. Childhood and adolescent obesity are closely linked to non-communicable diseases such as cardiovascular diseases, type 2 diabetes, and respiratory conditions (<xref ref-type="bibr" rid="ref5">5</xref>, <xref ref-type="bibr" rid="ref6">6</xref>). Moreover, obesity is also associated with behavioral problems, such as low levels of physical activity and physical fitness (<xref ref-type="bibr" rid="ref7">7</xref>). Additionally, obesity during early life often establishes a lifelong struggle with weight management. Given the challenged in weight loss, obesity in children and adolescents may increase the likelihood of premature mortality and physical morbidity persisting into adulthood (<xref ref-type="bibr" rid="ref8">8</xref>). Moreover, obesity in childhood and adolescence is associated with psychological risk factors, including low self-esteem, depression, and anxiety, which can lead to increased adult mortality and morbidity (<xref ref-type="bibr" rid="ref9">9</xref>). For instance, obese adolescents often face peer victimization, resulting in higher rates of low self-esteem and increased depression compared to their normal-weight peers (<xref ref-type="bibr" rid="ref10">10</xref>).</p>
<p>It has been known that regular physical activity participation has benefits for healthy weight status in children and adolescents (<xref ref-type="bibr" rid="ref11 ref12 ref13">11&#x2013;13</xref>). Furthermore, a cross-sectional study was conducted to assess if the intensity of physical activity moderates the link between physical activity and weight status among school-aged children (<xref ref-type="bibr" rid="ref14">14</xref>, <xref ref-type="bibr" rid="ref15">15</xref>). For example, Parikh and Stratton (<xref ref-type="bibr" rid="ref15">15</xref>) conducted a qualitative review and found that higher intensity of PA was the most significant predictor of weight status among children and adolescents. Moreover, a cross-sectional investigation was carried out to examine whether the intensity of physical activity moderates the relationship between physical activity and the risk of overweight or obesity in children (<xref ref-type="bibr" rid="ref14">14</xref>). The results suggested that lower level of VPA was associated with enhanced odds of overweight and adiposity (<xref ref-type="bibr" rid="ref14">14</xref>). Therefore, there is a need to examine the relationship between VPA and weight status in children and adolescents. In this regard, some qualitative reviews were conducted and found associations between VPA and weight status in this population (<xref ref-type="bibr" rid="ref16">16</xref>, <xref ref-type="bibr" rid="ref17">17</xref>). For instance, Gralla et al. (<xref ref-type="bibr" rid="ref17">17</xref>) conducted a narrative review and found that vigorous physical activity (VPA) was more strongly related to body composition in children and adolescents. A recent systematic review and meta-analysis synthesized the correlation between device-measured vigorous physical activity (VPA) and health outcomes, indicating an inverse relationship between VPA and overall adiposity [<italic>r</italic>&#x2009;=&#x2009;&#x2212;0.09, 95% confidence interval (CI)&#x2009;=&#x2009;&#x2212;0.15 to &#x2212;0.03], as well as overweight/obesity (<italic>r</italic>&#x2009;=&#x2009;&#x2212;0.20, 95%CI&#x2009;=&#x2009;&#x2212;0.38 to &#x2212;0.03) in children and adolescents (<xref ref-type="bibr" rid="ref18">18</xref>). Of note, Gralla et al. (<xref ref-type="bibr" rid="ref17">17</xref>) also found that some included studies reported insignificant associations between VPA and weight status in children and adolescents. For these reasons, population-based surveys are needed to investigate this relationship among children and adolescents, especially for potential confounding factors.</p>
<p>More importantly, dietary patterns have been recognized as an important factor affecting weight status in children and adolescents. For instance, one review that quantitatively synthesized the data suggested an association between diet and overweight/obesity. It showed that higher intake of sugar-sweetened beverages, fast food, meat and refined grains were associated with increased risk of overweight/obesity among adolescents (<xref ref-type="bibr" rid="ref19">19</xref>). Moreover, there is also a association between dietary patterns and VPA. For example, Durksen et al. (<xref ref-type="bibr" rid="ref20">20</xref>) found VPA was associated with healthier dietary patterns in adolescents. Nevertheless, previous studies did not examine diet when investigating the association between VPA and weight status in adolescents may make the results less credible. As an example, one international cross-sectional study involved 199,502 adolescents indicating no association between VPA and body mass index (<xref ref-type="bibr" rid="ref21">21</xref>). The originality of this study is that it uses a population-based sample to explore the association between VPA and weight status in adolescents, it takes dietary patterns into account. Meanwhile, our study includes data from 45 countries and regions in Europe, Central Asia, and North America, and is based on a large-scale study of the association between vigorous physical activity and weight status. The results of this study can inform the results of adolescent health interventions in an international context.</p>
</sec>
<sec sec-type="methods" id="sec6">
<label>2</label>
<title>Methods</title>
<sec id="sec7">
<label>2.1</label>
<title>Study design</title>
<p>The 2017/2018 Health Behavior in School-aged Children survey (HBSC) was a collaborative research initiative overseen by the World Health Organization. This cross-sectional study focused on individuals aged 11, 13, and 15, with an average deviation of 0.5&#x2009;years. Employing a systematic multistage stratified cluster randomized sampling method in each participating country, the HBSC survey aimed for a nationally representative sample. Approximately 1,500 students from each of the specified age groups were chosen in every HBSC country or region. The 2017/2018 survey was conducted in more than 40 countries in Europe, Central Asia, and North America,<xref ref-type="fn" rid="fn0001"><sup>1</sup></xref> across 45 countries and regions with data collected from 24,051 students (<xref ref-type="bibr" rid="ref22">22</xref>). All the participants in the HBSC survey provided the written consent. The study procedures received ethical approval from the institutional ethics committees in every participating country (<xref ref-type="bibr" rid="ref22">22</xref>). In total, 227,441 children and adolescents participated in the 2017/2018 survey.</p>
</sec>
<sec id="sec8">
<label>2.2</label>
<title>Measures</title>
<p>Participants&#x2019; frequency of vigorous physical activity was assessed with the following question: &#x201C;Outside school hours: how many often do you usually participated in physical activity in your free time that you get out of breath or sweat?&#x201D; Response options included &#x201C;Every day,&#x201D; &#x201C;4&#x2013;6 times a week,&#x201D; &#x201C;2&#x2013;3 times a week,&#x201D; &#x201C;Once a week,&#x201D; &#x201C;Once a month,&#x201D; &#x201C;Less than once a month,&#x201D; &#x201C;Never.&#x201D;</p>
<p>Participants were asking about the frequency of consuming breakfast on workdays and weekends, as well as the intake of fruits, vegetables, sweets, soft drinks, meal, smoking, and alcohol. Participants were required to answer the following questions. (1) &#x201C;How often do you usually have breakfast (more than a glass of milk or juice)?&#x201D; Response options ranged from &#x201C;Never&#x201D; to &#x201C;5 days&#x201D; for workdays and &#x201C;Never&#x201D; to &#x201C;Both days&#x201D; for weekends. (2) &#x201C;How many times a week do you usually eat fruits, vegetables and sweets or drink soft drinks?&#x201D; Response options included &#x201C;Never,&#x201D; &#x201C;Less once a week,&#x201D; &#x201C;Once a week,&#x201D; &#x201C;2&#x2013;4&#x2009;days a week,&#x201D; &#x201C;5&#x2013;6&#x2009;days a week,&#x201D; &#x201C;Once daily,&#x201D; &#x201C;More than once daily.&#x201D; (3) &#x201C;How often do you and your family usually have meals together?.&#x201D; Responses were &#x201C;Every day,&#x201D; &#x201C;Most days,&#x201D; &#x201C;About once a week,&#x201D; &#x201C;Less often&#x201D; and &#x201C;Never.&#x201D; (4) &#x201C;During the past 30&#x2009;days, how many days (if any) have you smoked cigarettes or drunk alcohol?.&#x201D; Responses included &#x201C;Never,&#x201D; &#x201C;1&#x2013;2&#x2009;days,&#x201D; &#x201C;3&#x2013;5&#x2009;days,&#x201D; &#x201C;6&#x2013;9&#x2009;days,&#x201D; &#x201C;10&#x2013;19&#x2009;days,&#x201D; &#x201C;20&#x2014;29&#x2009;days&#x201D; and &#x201C;30&#x2009;days (or more).&#x201D;</p>
<p>Weight status, as indicated by Body Mass Index (BMI), was computed using the formula (kg/m<sup>2</sup>) based on self-reported body weight (&#x201C;How much do you weigh without clothes?&#x201D;) and height (&#x201C;How tall are you without shoes?&#x201D;). The WHO gender-specific BMI for age growth charts were used to categorize participants&#x2019; weight status (<xref ref-type="bibr" rid="ref23">23</xref>). Children and adolescents falling above the 97th percentile was considered as obese, while those falling between 85th and 97th percentile was classified as overweight (<xref ref-type="bibr" rid="ref23">23</xref>).</p>
</sec>
<sec id="sec9">
<label>2.3</label>
<title>Statistical analysis</title>
<p>All analyses were conducted using IBM SPSS version 28.0. The descriptive characteristics of participants were reported as percentage with standard error and a 95% confidence interval. Ordered logistic regression models were employed to examine the association between vigorous physical activity and weight status across the overall sample, as well as separately for boys and girls. Participating in VPA every day was set as the reference group. All models were adjusted for age category, dietary patterns, and relative family affluence category (except for sex in the overall sample). The statistical significance level was set as <italic>p</italic>&#x2009;&#x003C;&#x2009;0.05 in this study.</p>
</sec>
</sec>
<sec sec-type="results" id="sec10">
<label>3</label>
<title>Results</title>
<p><xref ref-type="table" rid="tab1">Table 1</xref> presents the descriptive characteristics of the sample. 33.8% of participants were 11&#x2009;years old, 34.5% were 13&#x2009;years old and 31.8%were 15&#x2009;years old, with an average age of 13.49&#x2009;years. The sample comprised 49.3% males and 50.7% females. The mean BMI of the participants was 19.53, range of 11.02&#x2013;44.91. Regarding weight status, 14.2% were classified as underweight, 69.9% fell within the normal weight range, 13.0% were considered overweight, and 2.9% were classified as obese. The majority of participants engaged in VPA for 2&#x2013;3 times a week (30.0%), followed by 4&#x2013;6 times a week (23.6%) and daily (17.4%). A smaller proportion participated in VPA for once a week (13.5%), and less than once a month (4.3%) or not at all (6.8%). On weekdays, 57.9% had breakfast 5 days a week, while 17.9% never had breakfast. During the weekend, 76.4% had breakfast on both days, 15.1% on 1 day, and 8.5% never.</p>
<table-wrap position="float" id="tab1">
<label>Table 1</label>
<caption>
<p>The descriptive characteristics of the sample.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">Variables</th>
<th align="center" valign="top">Frequent (%)</th>
<th align="center" valign="top" colspan="2">95%CI</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">Sex</td>
<td/>
<td colspan="2"/>
</tr>
<tr>
<td align="left" valign="top">Male</td>
<td align="center" valign="top">49.3%</td>
<td align="center" valign="top">49.1%</td>
<td align="center" valign="top">49.5%</td>
</tr>
<tr>
<td align="left" valign="top">Female</td>
<td align="center" valign="top">50.7%</td>
<td align="center" valign="top">50.5%</td>
<td align="center" valign="top">50.9%</td>
</tr>
<tr>
<td align="left" valign="top">Age</td>
<td/>
<td colspan="2"/>
</tr>
<tr>
<td align="left" valign="top">11&#x2009;years</td>
<td align="center" valign="top">33.8%</td>
<td align="center" valign="top">33.9%</td>
<td align="center" valign="top">33.9%</td>
</tr>
<tr>
<td align="left" valign="top">13&#x2009;years</td>
<td align="center" valign="top">34.5%</td>
<td align="center" valign="top">34.3%</td>
<td align="center" valign="top">34.7%</td>
</tr>
<tr>
<td align="left" valign="top">15&#x2009;years</td>
<td align="center" valign="top">31.8%</td>
<td align="center" valign="top">31.6%</td>
<td align="center" valign="top">31.9%</td>
</tr>
<tr>
<td align="left" valign="top">Weight status</td>
<td/>
<td colspan="2"/>
</tr>
<tr>
<td align="left" valign="top">Thinness</td>
<td align="center" valign="top">14.2%</td>
<td align="center" valign="top">14.1%</td>
<td align="center" valign="top">14.4%</td>
</tr>
<tr>
<td align="left" valign="top">Normal weight</td>
<td align="center" valign="top">69.9%</td>
<td align="center" valign="top">69.7%</td>
<td align="center" valign="top">70.1%</td>
</tr>
<tr>
<td align="left" valign="top">Overweight</td>
<td align="center" valign="top">13.0%</td>
<td align="center" valign="top">12.8%</td>
<td align="center" valign="top">13.1%</td>
</tr>
<tr>
<td align="left" valign="top">Obesity</td>
<td align="center" valign="top">2.9%</td>
<td align="center" valign="top">2.8%</td>
<td align="center" valign="top">3.0%</td>
</tr>
<tr>
<td align="left" valign="top">VPA</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Every day</td>
<td align="center" valign="top">17.4%</td>
<td align="center" valign="top">17.2%</td>
<td align="center" valign="top">17.6%</td>
</tr>
<tr>
<td align="left" valign="top">4&#x2013;6 times a week</td>
<td align="center" valign="top">23.6%</td>
<td align="center" valign="top">23.4%</td>
<td align="center" valign="top">23.8%</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;3 times</td>
<td align="center" valign="top">30.0%</td>
<td align="center" valign="top">29.8%</td>
<td align="center" valign="top">30.1%</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">13.5%</td>
<td align="center" valign="top">13.4%</td>
<td align="center" valign="top">13.7%</td>
</tr>
<tr>
<td align="left" valign="top">Once a month</td>
<td align="center" valign="top">4.4%</td>
<td align="center" valign="top">4.3%</td>
<td align="center" valign="top">4.5%</td>
</tr>
<tr>
<td align="left" valign="top">Less than once a month</td>
<td align="center" valign="top">4.3%</td>
<td align="center" valign="top">4.2%</td>
<td align="center" valign="top">4.4%</td>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">6.8%</td>
<td align="center" valign="top">6.7%</td>
<td align="center" valign="top">6.9%</td>
</tr>
<tr>
<td align="left" valign="top">Physact60</td>
<td align="center" valign="top">4.057667</td>
<td align="center" valign="top">4.05</td>
<td align="center" valign="top">4.07</td>
</tr>
<tr>
<td align="left" valign="top">Breakfast (weekdays)</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">17.9%</td>
<td align="center" valign="top">17.7%</td>
<td align="center" valign="top">18.0%</td>
</tr>
<tr>
<td align="left" valign="top">1 day</td>
<td align="center" valign="top">5.4%</td>
<td align="center" valign="top">5.3%</td>
<td align="center" valign="top">5.5%</td>
</tr>
<tr>
<td align="left" valign="top">2 days</td>
<td align="center" valign="top">5.9%</td>
<td align="center" valign="top">5.8%</td>
<td align="center" valign="top">6.0%</td>
</tr>
<tr>
<td align="left" valign="top">3 days</td>
<td align="center" valign="top">7.1%</td>
<td align="center" valign="top">7.0%</td>
<td align="center" valign="top">7.2%</td>
</tr>
<tr>
<td align="left" valign="top">4 days</td>
<td align="center" valign="top">5.9%</td>
<td align="center" valign="top">5.8%</td>
<td align="center" valign="top">6.0%</td>
</tr>
<tr>
<td align="left" valign="top">5 days</td>
<td align="center" valign="top">57.9%</td>
<td align="center" valign="top">57.7%</td>
<td align="center" valign="top">58.1%</td>
</tr>
<tr>
<td align="left" valign="top">Breakfast (weekend)</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">8.5%</td>
<td align="center" valign="top">8.3%</td>
<td align="center" valign="top">8.6%</td>
</tr>
<tr>
<td align="left" valign="top">1 day</td>
<td align="center" valign="top">15.1%</td>
<td align="center" valign="top">14.9%</td>
<td align="center" valign="top">15.2%</td>
</tr>
<tr>
<td align="left" valign="top">Both days</td>
<td align="center" valign="top">76.4%</td>
<td align="center" valign="top">76.3%</td>
<td align="center" valign="top">76.6%</td>
</tr>
<tr>
<td align="left" valign="top">Fruits</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">3.1%</td>
<td align="center" valign="top">3.1%</td>
<td align="center" valign="top">3.2%</td>
</tr>
<tr>
<td align="left" valign="top">Less once a week</td>
<td align="center" valign="top">6.3%</td>
<td align="center" valign="top">6.2%</td>
<td align="center" valign="top">6.4%</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">9.4%</td>
<td align="center" valign="top">9.3%</td>
<td align="center" valign="top">9.5%</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;4&#x2009;days a week</td>
<td align="center" valign="top">25.2%</td>
<td align="center" valign="top">25.0%</td>
<td align="center" valign="top">25.4%</td>
</tr>
<tr>
<td align="left" valign="top">5&#x2013;6&#x2009;days a week</td>
<td align="center" valign="top">15.7%</td>
<td align="center" valign="top">15.5%</td>
<td align="center" valign="top">15.8%</td>
</tr>
<tr>
<td align="left" valign="top">Once daily</td>
<td align="center" valign="top">17.6%</td>
<td align="center" valign="top">17.5%</td>
<td align="center" valign="top">17.8%</td>
</tr>
<tr>
<td align="left" valign="top">More than once daily</td>
<td align="center" valign="top">22.6%</td>
<td align="center" valign="top">22.4%</td>
<td align="center" valign="top">22.8%</td>
</tr>
<tr>
<td align="left" valign="top">Vegetables</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">4.8%</td>
<td align="center" valign="top">4.7%</td>
<td align="center" valign="top">4.8%</td>
</tr>
<tr>
<td align="left" valign="top">Less once a week</td>
<td align="center" valign="top">6.1%</td>
<td align="center" valign="top">6.0%</td>
<td align="center" valign="top">6.2%</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">9.5%</td>
<td align="center" valign="top">9.3%</td>
<td align="center" valign="top">9.6%</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;4&#x2009;days a week</td>
<td align="center" valign="top">22.5%</td>
<td align="center" valign="top">22.3%</td>
<td align="center" valign="top">22.7%</td>
</tr>
<tr>
<td align="left" valign="top">5&#x2013;6&#x2009;days a week</td>
<td align="center" valign="top">18.5%</td>
<td align="center" valign="top">18.4%</td>
<td align="center" valign="top">18.7%</td>
</tr>
<tr>
<td align="left" valign="top">Once daily</td>
<td align="center" valign="top">19.4%</td>
<td align="center" valign="top">19.2%</td>
<td align="center" valign="top">19.5%</td>
</tr>
<tr>
<td align="left" valign="top">More than once daily</td>
<td align="center" valign="top">19.3%</td>
<td align="center" valign="top">19.1%</td>
<td align="center" valign="top">19.4%</td>
</tr>
<tr>
<td align="left" valign="top">Sweets</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">4.1%</td>
<td align="center" valign="top">4.1%</td>
<td align="center" valign="top">4.2%</td>
</tr>
<tr>
<td align="left" valign="top">Less once a week</td>
<td align="center" valign="top">12.4%</td>
<td align="center" valign="top">12.3%</td>
<td align="center" valign="top">12.5%</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">18.1%</td>
<td align="center" valign="top">17.9%</td>
<td align="center" valign="top">18.2%</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;4&#x2009;days a week</td>
<td align="center" valign="top">27.3%</td>
<td align="center" valign="top">27.1%</td>
<td align="center" valign="top">27.4%</td>
</tr>
<tr>
<td align="left" valign="top">5&#x2013;6&#x2009;days a week</td>
<td align="center" valign="top">12.9%</td>
<td align="center" valign="top">12.8%</td>
<td align="center" valign="top">13.1%</td>
</tr>
<tr>
<td align="left" valign="top">Once daily</td>
<td align="center" valign="top">12.7%</td>
<td align="center" valign="top">12.6%</td>
<td align="center" valign="top">12.8%</td>
</tr>
<tr>
<td align="left" valign="top">More than once daily</td>
<td align="center" valign="top">12.5%</td>
<td align="center" valign="top">12.4%</td>
<td align="center" valign="top">12.6%</td>
</tr>
<tr>
<td align="left" valign="top">Soft drinks</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">14.0%</td>
<td align="center" valign="top">13.9%</td>
<td align="center" valign="top">14.2%</td>
</tr>
<tr>
<td align="left" valign="top">Less once a week</td>
<td align="center" valign="top">23.9%</td>
<td align="center" valign="top">23.7%</td>
<td align="center" valign="top">24.1%</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">18.9%</td>
<td align="center" valign="top">18.8%</td>
<td align="center" valign="top">19.1%</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;4&#x2009;days a week</td>
<td align="center" valign="top">19.1%</td>
<td align="center" valign="top">19.0%</td>
<td align="center" valign="top">19.3%</td>
</tr>
<tr>
<td align="left" valign="top">5&#x2013;6&#x2009;days a week</td>
<td align="center" valign="top">8.1%</td>
<td align="center" valign="top">8.0%</td>
<td align="center" valign="top">8.2%</td>
</tr>
<tr>
<td align="left" valign="top">Once daily</td>
<td align="center" valign="top">6.8%</td>
<td align="center" valign="top">6.7%</td>
<td align="center" valign="top">6.9%</td>
</tr>
<tr>
<td align="left" valign="top">More than once daily</td>
<td align="center" valign="top">9.1%</td>
<td align="center" valign="top">9.0%</td>
<td align="center" valign="top">9.2%</td>
</tr>
<tr>
<td align="left" valign="top">Meal</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Every day</td>
<td align="left" valign="top">49.9%</td>
<td align="left" valign="top">49.7%</td>
<td align="left" valign="top">50.1%</td>
</tr>
<tr>
<td align="left" valign="top">Most days</td>
<td align="left" valign="top">32.0%</td>
<td align="left" valign="top">31.8%</td>
<td align="left" valign="top">32.2%</td>
</tr>
<tr>
<td align="left" valign="top">About once a week</td>
<td align="left" valign="top">9.0%</td>
<td align="left" valign="top">8.9%</td>
<td align="left" valign="top">9.1%</td>
</tr>
<tr>
<td align="left" valign="top">Less often</td>
<td align="left" valign="top">6.6%</td>
<td align="left" valign="top">6.5%</td>
<td align="left" valign="top">6.7%</td>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="left" valign="top">2.5%</td>
<td align="left" valign="top">2.5%</td>
<td align="left" valign="top">2.6%</td>
</tr>
<tr>
<td align="left" valign="top">Smoking</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="left" valign="top">93.1%</td>
<td align="left" valign="top">93.0%</td>
<td align="left" valign="top">93.2%</td>
</tr>
<tr>
<td align="left" valign="top">1&#x2013;2&#x2009;days</td>
<td align="left" valign="top">2.3%</td>
<td align="left" valign="top">2.3%</td>
<td align="left" valign="top">2.4%</td>
</tr>
<tr>
<td align="left" valign="top">3&#x2013;5&#x2009;days</td>
<td align="left" valign="top">0.9%</td>
<td align="left" valign="top">0.9%</td>
<td align="left" valign="top">1.0%</td>
</tr>
<tr>
<td align="left" valign="top">6&#x2013;9&#x2009;days</td>
<td align="left" valign="top">0.6%</td>
<td align="left" valign="top">0.6%</td>
<td align="left" valign="top">0.7%</td>
</tr>
<tr>
<td align="left" valign="top">10&#x2013;19&#x2009;days</td>
<td align="left" valign="top">0.6%</td>
<td align="left" valign="top">0.6%</td>
<td align="left" valign="top">0.7%</td>
</tr>
<tr>
<td align="left" valign="top">20&#x2013;29&#x2009;days</td>
<td align="left" valign="top">0.6%</td>
<td align="left" valign="top">0.5%</td>
<td align="left" valign="top">0.6%</td>
</tr>
<tr>
<td align="left" valign="top">30&#x2009;days (or more)</td>
<td align="left" valign="top">1.8%</td>
<td align="left" valign="top">1.7%</td>
<td align="left" valign="top">1.8%</td>
</tr>
<tr>
<td align="left" valign="top">Alcohol</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="left" valign="top">81.2%</td>
<td align="left" valign="top">81.0%</td>
<td align="left" valign="top">81.3%</td>
</tr>
<tr>
<td align="left" valign="top">1&#x2013;2&#x2009;days</td>
<td align="left" valign="top">11.5%</td>
<td align="left" valign="top">11.4%</td>
<td align="left" valign="top">11.7%</td>
</tr>
<tr>
<td align="left" valign="top">3&#x2013;5&#x2009;days</td>
<td align="left" valign="top">3.6%</td>
<td align="left" valign="top">3.6%</td>
<td align="left" valign="top">3.7%</td>
</tr>
<tr>
<td align="left" valign="top">6&#x2013;9&#x2009;days</td>
<td align="left" valign="top">1.7%</td>
<td align="left" valign="top">1.6%</td>
<td align="left" valign="top">1.7%</td>
</tr>
<tr>
<td align="left" valign="top">10&#x2013;19&#x2009;days</td>
<td align="left" valign="top">0.8%</td>
<td align="left" valign="top">0.8%</td>
<td align="left" valign="top">0.9%</td>
</tr>
<tr>
<td align="left" valign="top">20&#x2013;29&#x2009;days</td>
<td align="left" valign="top">0.3%</td>
<td align="left" valign="top">0.3%</td>
<td align="left" valign="top">0.3%</td>
</tr>
<tr>
<td align="left" valign="top">30&#x2009;days (or more)</td>
<td align="left" valign="top">0.9%</td>
<td align="left" valign="top">0.8%</td>
<td align="left" valign="top">0.9%</td>
</tr>
<tr>
<td align="left" valign="top">Relative family affluence categorical</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Lowest</td>
<td align="left" valign="top">19.8%</td>
<td align="left" valign="top">19.6%</td>
<td align="left" valign="top">19.9%</td>
</tr>
<tr>
<td align="left" valign="top">Medium</td>
<td align="left" valign="top">61.4%</td>
<td align="left" valign="top">61.2%</td>
<td align="left" valign="top">61.6%</td>
</tr>
<tr>
<td align="left" valign="top">Highest</td>
<td align="left" valign="top">18.8%</td>
<td align="left" valign="top">18.6%</td>
<td align="left" valign="top">19.0%</td>
</tr>
</tbody>
</table>
</table-wrap>
<p>Regarding dietary habits, 22.6% of participants consumed fruit more than once daily, while 9.4% consumed fruit once a week, and 6.3% less than once a week. For vegetable consumption, 38.6% consumed vegetables once a day or more, while a smaller proportion consumed vegetables less frequently. In terms of sweet consumption, 25.2% consumed sweets once daily or more, and 34.6% consumed sweets once a week or less. Additionally, only 15.9% consumed soft drinks once daily or more, with the majority consuming them once a week or less. Almost half of the participants consumed meals daily (49.9%), and the majority did not smoke (93.1%) or drink alcohol regularly (81.2%). Regarding relative family affluence categorical, 61.4% were at a medium level, with smaller proportions in the lowest 20% (19.8%) or highest 20% (18.8%).</p>
<p><xref ref-type="table" rid="tab2">Table 2</xref> illustrates the association between vigorous physical activity (VPA) frequency and weight status across the entire sample. It reveals that, compared to daily VPA, less frequency is linked to higher odds of obesity. For example, those who participated in VPA for 4&#x2013;6 times a week (OR&#x2009;=&#x2009;1.10, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.13), 2&#x2013;3 times a week (OR&#x2009;=&#x2009;1.21, 95% CI&#x2009;=&#x2009;1.17&#x2013;1.25), or once a week (OR&#x2009;=&#x2009;1.21, 95% CI&#x2009;=&#x2009;1.16&#x2013;1.25) all have higher odds of abnormal weight status. In terms of covariates, females (OR&#x2009;=&#x2009;0.62, 95% CI&#x2009;=&#x2009;0.61&#x2013;0.64) are less likely to have abnormal weight status compared to males. Older participants (OR&#x2009;=&#x2009;1.07, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.08) are more likely to have abnormal weight status. Breakfast consumption during weekdays (OR&#x2009;=&#x2009;0.94, 95% CI&#x2009;=&#x2009;0.93&#x2013;0.94) and weekends (OR&#x2009;=&#x2009;0.93, 95% CI&#x2009;=&#x2009;0.91&#x2013;0.95) is associated with reduced odds of abnormal weight status. Higher fruit consumption (OR&#x2009;=&#x2009;1.01, 95% CI&#x2009;=&#x2009;1.00&#x2013;1.02) is linked to higher odds of abnormal weight status, while sweet consumption (OR&#x2009;=&#x2009;0.91, 95% CI&#x2009;=&#x2009;0.90&#x2013;0.91) is associated with lower odds. Moreover, regular meal consumption (OR&#x2009;=&#x2009;1.08, 95% CI&#x2009;=&#x2009;1.07&#x2013;1.09), smoking (OR&#x2009;=&#x2009;1.02, 95% CI&#x2009;=&#x2009;1.01&#x2013;1.03), and alcohol consumption (OR&#x2009;=&#x2009;1.06, 95% CI&#x2009;=&#x2009;1.05&#x2013;1.07) are all related to higher odds of abnormal weight status. Lastly, relative family affluence categorical (OR&#x2009;=&#x2009;0.87, 95% CI&#x2009;=&#x2009;0.85&#x2013;0.89) is associated with lower odds of abnormal weight status.</p>
<table-wrap position="float" id="tab2">
<label>Table 2</label>
<caption>
<p>The association between VPA and weight status in overall sample.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">IOTF4</th>
<th align="center" valign="top">Odds ratio</th>
<th align="center" valign="top">Std. err.</th>
<th align="center" valign="top">
<italic>t</italic>
</th>
<th align="center" valign="top"><italic>P</italic> &#x003E; <italic>t</italic></th>
<th align="center" valign="top" colspan="2">[95% conf. interval]</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">VPA</td>
<td/>
<td/>
<td/>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Every day</td>
<td align="center" valign="top">REF</td>
<td/>
<td/>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">4&#x2013;6 times a week</td>
<td align="center" valign="top">1.10</td>
<td align="center" valign="top">0.02</td>
<td align="center" valign="top">5.78</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.06</td>
<td align="center" valign="top">1.13</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;3 times a week</td>
<td align="center" valign="top">1.21</td>
<td align="center" valign="top">0.02</td>
<td align="center" valign="top">12.47</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.17</td>
<td align="center" valign="top">1.25</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">1.21</td>
<td align="center" valign="top">0.02</td>
<td align="center" valign="top">10</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.16</td>
<td align="center" valign="top">1.25</td>
</tr>
<tr>
<td align="left" valign="top">Once a month</td>
<td align="center" valign="top">1.20</td>
<td align="center" valign="top">0.03</td>
<td align="center" valign="top">6.55</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.14</td>
<td align="center" valign="top">1.27</td>
</tr>
<tr>
<td align="left" valign="top">Less than once a month</td>
<td align="center" valign="top">1.31</td>
<td align="center" valign="top">0.04</td>
<td align="center" valign="top">9.6</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.24</td>
<td align="center" valign="top">1.39</td>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">1.17</td>
<td align="center" valign="top">0.03</td>
<td align="center" valign="top">6.69</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.11</td>
<td align="center" valign="top">1.22</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>All models were controlled for sex, age, relative family affluence categorical, breakfast on workdays and weekend, intake of fruits, vegetables, sweets, soft drinks, meal, smoking, and alcohol; Bold numbers: statistically significant at <italic>p</italic>&#x2009;&#x003C;&#x2009;0.05.</p>
</table-wrap-foot>
</table-wrap>
<p><xref ref-type="table" rid="tab3">Table 3</xref> shows the association between VPA frequency and weight status in boys. It reveals that, compared to daily VPA, less frequency is linked to higher odds of abnormal weight status. For example, those who participated in VPA for 4&#x2013;6 times a week (OR&#x2009;=&#x2009;1.09, 95% CI&#x2009;=&#x2009;1.04&#x2013;1.13), 2&#x2013;3 times a week (OR&#x2009;=&#x2009;1.22, 95% CI&#x2009;=&#x2009;1.17&#x2013;1.27), or once a week (OR&#x2009;=&#x2009;1.25, 95% CI&#x2009;=&#x2009;1.19&#x2013;1.32) all have higher odds of abnormal weight status. In terms of covariates, older participants (OR&#x2009;=&#x2009;1.08, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.10) are more likely to have abnormal weight status. Breakfast consumption during weekdays (OR&#x2009;=&#x2009;0.94, 95% CI&#x2009;=&#x2009;0.93&#x2013;0.94) and weekends (OR&#x2009;=&#x2009;0.93, 95% CI&#x2009;=&#x2009;0.91&#x2013;0.95) is associated with reduced odds of abnormal weight status. Higher fruit consumption (OR&#x2009;=&#x2009;1.01, 95% CI&#x2009;=&#x2009;1.00&#x2013;1.02), regular meal consumption (OR&#x2009;=&#x2009;1.07, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.09), smoking (OR&#x2009;=&#x2009;1.02, 95% CI&#x2009;=&#x2009;1.01&#x2013;1.04), and alcohol consumption (OR&#x2009;=&#x2009;1.06, 95% CI&#x2009;=&#x2009;1.05&#x2013;1.08) are all related to higher odds of abnormal weight status. Conversely, sweet consumption (OR&#x2009;=&#x2009;0.91, 95% CI&#x2009;=&#x2009;0.90&#x2013;0.92) and relative family affluence categorical (OR&#x2009;=&#x2009;0.89, 95% CI&#x2009;=&#x2009;0.87&#x2013;0.91) are associated with lower odds of abnormal weight status.</p>
<table-wrap position="float" id="tab3">
<label>Table 3</label>
<caption>
<p>The association between VPA and weight status in boys.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">IOTF4</th>
<th align="center" valign="top">Odds ratio</th>
<th align="center" valign="top">Std. err.</th>
<th align="center" valign="top">
<italic>t</italic>
</th>
<th align="center" valign="top"><italic>P</italic>&#x2009;&#x003E;&#x2009;<italic>t</italic></th>
<th align="center" valign="top" colspan="2">[95% conf. interval]</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">VPA</td>
<td/>
<td/>
<td/>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Every day</td>
<td align="center" valign="top">REF</td>
<td/>
<td/>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">4&#x2013;6 times a week</td>
<td align="center" valign="top">1.09</td>
<td align="center" valign="top">0.0222658</td>
<td align="center" valign="top">4.08</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.04</td>
<td align="center" valign="top">1.13</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;3 times a week</td>
<td align="center" valign="top">1.22</td>
<td align="center" valign="top">0.0248058</td>
<td align="center" valign="top">9.83</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.17</td>
<td align="center" valign="top">1.27</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">1.25</td>
<td align="center" valign="top">0.0339764</td>
<td align="center" valign="top">8.36</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.19</td>
<td align="center" valign="top">1.32</td>
</tr>
<tr>
<td align="left" valign="top">Once a month</td>
<td align="center" valign="top">1.18</td>
<td align="center" valign="top">0.0510864</td>
<td align="center" valign="top">3.9</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.09</td>
<td align="center" valign="top">1.29</td>
</tr>
<tr>
<td align="left" valign="top">Less than once a month</td>
<td align="center" valign="top">1.39</td>
<td align="center" valign="top">0.0592826</td>
<td align="center" valign="top">7.82</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.28</td>
<td align="center" valign="top">1.52</td>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">1.21</td>
<td align="center" valign="top">0.0414515</td>
<td align="center" valign="top">5.57</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.13</td>
<td align="center" valign="top">1.29</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>All models were controlled for sex, age, relative family affluence categorical, breakfast on workdays and weekend, intake of fruits, vegetables, sweets, soft drinks, meal, smoking, and alcohol; Bold numbers: statistically significant at <italic>P</italic>&#x2009;&#x003C;&#x2009;0.05.</p>
</table-wrap-foot>
</table-wrap>
<p><xref ref-type="table" rid="tab4">Table 4</xref> presents the association between VPA frequency and weight status in girls. It reveals that, compared to daily VPA, less frequency is associated with higher odds of abnormal weight status. For instance, those who participated in VPA for 4&#x2013;6 times a week (OR&#x2009;=&#x2009;1.11, 95% CI&#x2009;=&#x2009;1.06&#x2013;1.16), 2&#x2013;3 times a week (OR&#x2009;=&#x2009;1.20, 95% CI&#x2009;=&#x2009;1.14&#x2013;1.25), or once a week (OR&#x2009;=&#x2009;1.17, 95% CI&#x2009;=&#x2009;1.11&#x2013;1.23) all have higher odds of abnormal weight status. In terms of covariates, older participants (OR&#x2009;=&#x2009;1.07, 95% CI&#x2009;=&#x2009;1.05&#x2013;1.09) are more likely to have abnormal weight status. Breakfast consumption during weekdays (OR&#x2009;=&#x2009;0.94, 95% CI&#x2009;=&#x2009;0.93&#x2013;0.94) and weekends (OR&#x2009;=&#x2009;0.93, 95% CI&#x2009;=&#x2009;0.91&#x2013;0.96) is associated with reduced odds of abnormal weight status.</p>
<table-wrap position="float" id="tab4">
<label>Table 4</label>
<caption>
<p>The association between VPA and weight status in girls.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">IOTF4</th>
<th align="center" valign="top">Odds ratio</th>
<th align="center" valign="top">Std. err.</th>
<th align="center" valign="top">
<italic>t</italic>
</th>
<th align="center" valign="top"><italic>P</italic> &#x003E; <italic>t</italic></th>
<th align="center" valign="top" colspan="2">[95%conf. interval]</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">VPA</td>
<td/>
<td/>
<td/>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">Every day</td>
<td align="center" valign="top">REF</td>
<td/>
<td/>
<td/>
<td/>
<td/>
</tr>
<tr>
<td align="left" valign="top">4&#x2013;6 times a week</td>
<td align="center" valign="top">1.11</td>
<td align="center" valign="top">0.0274137</td>
<td align="center" valign="top">4.19</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.06</td>
<td align="center" valign="top">1.16</td>
</tr>
<tr>
<td align="left" valign="top">2&#x2013;3 times a week</td>
<td align="center" valign="top">1.20</td>
<td align="center" valign="top">0.0281858</td>
<td align="center" valign="top">7.62</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.14</td>
<td align="center" valign="top">1.25</td>
</tr>
<tr>
<td align="left" valign="top">Once a week</td>
<td align="center" valign="top">1.17</td>
<td align="center" valign="top">0.0314526</td>
<td align="center" valign="top">5.86</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.11</td>
<td align="center" valign="top">1.23</td>
</tr>
<tr>
<td align="left" valign="top">Once a month</td>
<td align="center" valign="top">1.20</td>
<td align="center" valign="top">0.0448791</td>
<td align="center" valign="top">4.98</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.12</td>
<td align="center" valign="top">1.30</td>
</tr>
<tr>
<td align="left" valign="top">Less than once a month</td>
<td align="center" valign="top">1.25</td>
<td align="center" valign="top">0.0482306</td>
<td align="center" valign="top">5.83</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.16</td>
<td align="center" valign="top">1.35</td>
</tr>
<tr>
<td align="left" valign="top">Never</td>
<td align="center" valign="top">1.13</td>
<td align="center" valign="top">0.0356745</td>
<td align="center" valign="top">3.81</td>
<td align="center" valign="top">&#x003C;0.001</td>
<td align="center" valign="top">1.06</td>
<td align="center" valign="top">1.20</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>All models were controlled for sex, age, relative family affluence categorical, breakfast on workdays and weekend, intake of fruits, vegetables, sweets, soft drinks, meal, smoking, and alcohol; Bold numbers: statistically significant at <italic>P</italic>&#x2009;&#x003C;&#x2009;0.05.</p>
</table-wrap-foot>
</table-wrap>
<p>Higher fruit consumption (OR&#x2009;=&#x2009;1.01, 95% CI&#x2009;=&#x2009;1.00&#x2013;1.02), regular meal consumption (OR&#x2009;=&#x2009;1.08, 95% CI&#x2009;=&#x2009;1.07&#x2013;1.10), smoking (OR&#x2009;=&#x2009;1.01, 95% CI = 1.00&#x2013;1.03), and alcohol consumption (OR&#x2009;=&#x2009;1.06, 95% CI&#x2009;=&#x2009;1.04&#x2013;1.08) are all related to higher odds of abnormal weight status. Conversely, sweet consumption (OR&#x2009;=&#x2009;0.91, 95% CI&#x2009;=&#x2009;0.90&#x2013;0.92) and relative family affluence categorical (OR&#x2009;=&#x2009;0.85, 95% CI&#x2009;=&#x2009;0.83&#x2013;0.87) are associated with lower odds of abnormal weight status.</p>
</sec>
<sec sec-type="discussion" id="sec11">
<label>4</label>
<title>Discussion</title>
<p>This study based on a population sample examined the association between participation in vigorous physical activity (VPA) and weight status among adolescents. The findings suggested that, compared to adolescents who participated in VPA more frequently, those who engaged in less frequent VPA are more likely to have higher odds of unhealthy weight status. Our findings are consistent with several previous studies (<xref ref-type="bibr" rid="ref24">24</xref>, <xref ref-type="bibr" rid="ref25">25</xref>). For example, Gutin et al. (<xref ref-type="bibr" rid="ref26">26</xref>) investigated 421 high school students and found that lower amount of VPA participation was associated with high body fat [<italic>&#x03B2;</italic>&#x2009;=&#x2009;&#x2212;4.19, SE (standard error)&#x2009;=&#x2009;1.02, <italic>p</italic>&#x2009;=&#x2009;0.001]. Another cross-sectional study involved 409 children using accelerometers found a positive association between VPA participation and normal weight status in boys [OR (odd ratios)&#x2009;=&#x2009;1.13, 95%CI&#x2009;=&#x2009;1.03 to 0.23, <italic>p</italic>&#x2009;=&#x2009;0.01] and girls (OR&#x2009;=&#x2009;1.13, 95%CI&#x2009;=&#x2009;1.02&#x2013;1.25, <italic>p</italic>&#x2009;=&#x2009;0.03) (<xref ref-type="bibr" rid="ref24">24</xref>). However, an international cross-sectional study of 199,502 adolescents found that no significant difference in BMI between those who did not participate in VPA and those who participated frequently (BMI: +0.01&#x2009;kg/m<sup>2</sup>, 95%CI&#x2009;=&#x2009;&#x2212;0.03&#x2013;0.05) (<xref ref-type="bibr" rid="ref21">21</xref>). Additionally, participants who infrequently engaged in VPA (BMI: +0.19, 95%CI&#x2009;=&#x2009;0.15&#x2013;0.23) had higher BMI values when compared to did not participated in VPA (<xref ref-type="bibr" rid="ref21">21</xref>). As discussed in the previous study, the slight higher BMI values may be attributed to the greater muscle mass gained from participating in VPA when compared to their physically inactive counterparts (<xref ref-type="bibr" rid="ref21">21</xref>). Notably, the previous study did not include potential covariates, which could serve as an additional explanation for the insignificant association between VPA participation and BMI among adolescents. It is well-established that factors beyond physical activity, such as age, gender, family affluence and diet, are all associated with weight status in adolescents (<xref ref-type="bibr" rid="ref27">27</xref>). Therefore, incorporating potential covariates may enhance our understanding of the relationship between VPA and weight status in this population.</p>
<p>Moreover, as an important factor affecting weight status in children and adolescents, dietary patterns may provide another explanation for the insignificant association observed in the previous study (<xref ref-type="bibr" rid="ref19">19</xref>). Individuals who engage in higher doses of physical activity experience a dietary caloric compensation, characterized by an increased intake of calorie dense, nutrient deficient foods (<xref ref-type="bibr" rid="ref28">28</xref>). Diet, as the primary way of energy intake for adolescents, also has a direct contribution to obesity. Increased dietary calories in adolescents increase the possibility of obesity (<xref ref-type="bibr" rid="ref29">29</xref>). In addition, Durksen et al. (<xref ref-type="bibr" rid="ref20">20</xref>) found that VPA was associated with healthier dietary patterns, and physically active adolescents tend to consume less unhealthy food when compared to their less active counterparts. All of this evidence suggests that that dietary patterns may significantly influence the association between VPA and weights status. Therefore, when addressing adolescents&#x2019; weight status, it is essential to consider the interplay between VPA, weights status and diet simultaneously. Our findings underscore the importance of identifying more potential factors that may influence the association between VPA and weight status in adolescents.</p>
<p>Our findings indicated that infrequent participation in VPA was consistently associated with higher BMI in both boys and girls. Previous studies have also highlighted sex differences in the relationship between VPA and weight status. For instance, a longitudinal study involving 462 youth suggested that girls, whether with or without obesity, exhibit lower amount VPA compared to boys (<xref ref-type="bibr" rid="ref30">30</xref>). A systematic review has qualitatively synthesized the relationship between objectively measured VPA and weight status, suggesting a potential differential association between VPA and weight status for boys and girls (<xref ref-type="bibr" rid="ref17">17</xref>). However, to better understand the moderating effects of sex, more robust evidence is warranted. Notably, a substantial disagreement exists between subjective (e.g., questionnaire-based) and objective (e.g., accelerometer-based) measures when collecting VPA data among adolescents (<xref ref-type="bibr" rid="ref31">31</xref>). Therefore, conducting population-based surveys with reliable and valid assessment is essential to enhance our comprehension of the relationship between VPA and weight status in adolescents.</p>
<p>The significant association between physical activity and weight status can be explained by energy expenditure. Compared to low intensity of physical activity, vigorous physical activity can enhance adolescents&#x2019; energy expenditure, potentially achieving weight loss. Moreover, VPA plays a crucial role in regulating various hormones and myokines related to body composition, which may impact energy balance and appetite control, potentially alleviating hunger in obese individuals (<xref ref-type="bibr" rid="ref32">32</xref>, <xref ref-type="bibr" rid="ref33">33</xref>). Conversely, VPA could enhance fat oxidation, particularly in high-fat diets (<xref ref-type="bibr" rid="ref32">32</xref>, <xref ref-type="bibr" rid="ref33">33</xref>). Physiologically, VPA may facilitate greater fat utilization, possibly linked to quantitative and qualitative mitochondrial adaptations. Significantly, this encompasses notable enhancements in skeletal muscle mitochondrial volume and density, along with inherent fatty acid oxidation within the mitochondria (<xref ref-type="bibr" rid="ref34">34</xref>). Furthermore, VPA elicits a heightened catecholamine response in individuals, with greater physical activity intensity corresponding to higher catecholamines concentration (<xref ref-type="bibr" rid="ref35">35</xref>). Altered catecholamine responses influence the sensitivity of alpha and beta adrenergic receptors in adipose tissue, leading to reduced lipolysis and increased fat storage. Catecholamines play a crucial role in driving lipolysis both during and after physical activity, thereby impacting fat mobilization and storage (<xref ref-type="bibr" rid="ref36">36</xref>).</p>
</sec>
<sec id="sec12">
<label>5</label>
<title>Strengths and limitations</title>
<p>One notable strength of this study lies in its internationally representative sample of adolescents from 45 countries, encompassing a wide range of socioeconomic background. The adoption of a standardized methodological protocol for data collection across these diverse countries serves to mitigate potential measurement biases, particularly when conducting an international survey. Although a large number of studies have confirmed the negative association between VPA and adolescent obesity, others have found no significant association (<xref ref-type="bibr" rid="ref37">37</xref>). This issue may be a result of the complexity of energy balance, and adolescent obesity is not only influenced by physical activity but also by other confounding factors such as dietary intake, hormonal regulation and genetic variation (<xref ref-type="bibr" rid="ref38">38</xref>). There are also limitations to this study. Firstly, although it has controlled for dietary intake such as breakfast, fruits and vegetables and smoking other health behaviors, may not have fully covered all the factors that influence obesity. For example, ethnic origin of the participants and the level of sexual maturity in adolescents may be related to weight status but was not controlled for due to study conditions. Secondly, this study is cross-sectional design, which limits the ability of this study to draw causal conclusions. Thirdly, this study used BMI to define obesity in children and adolescents, this may have errors, for example children with the same BMI may have different muscle mass and fat mass. Fourthly, this study was based on self-report and there may be some reporting bias, adolescents may have underestimated their weight and overestimated their vigorous physical activity. Fifthly, the VPA for this study used data from outdoor sessions based on breathlessness and sweating. This may deviate from the actual performance of VPA. On the one hand, there are many factors that may influence the performance of outdoor vigorous intensity activities in different regions. On the other hand, short, intermittent periods of intense activity may not be included.</p>
</sec>
<sec sec-type="conclusions" id="sec13">
<label>6</label>
<title>Conclusion</title>
<p>This population-based study suggested that infrequent VPA participation was associated with unhealthy weight status in adolescents compared to their physically active counterparts. Additionally, this association was consistent in both boys and girls. This emphasizes the importance of VPA in maintaining healthy weight status. In future, more population-based surveys are needed to identify potential confounding factors, which can provide a better understanding of this relationship in young individuals.</p>
</sec>
<sec sec-type="data-availability" id="sec14">
<title>Data availability statement</title>
<p>Publicly available datasets were analyzed in this study. This data can be found at: <ext-link xlink:href="https://hbsc.org/data/" ext-link-type="uri">https://hbsc.org/data/</ext-link>.</p>
</sec>
<sec sec-type="ethics-statement" id="sec15">
<title>Ethics statement</title>
<p>Written informed consent was obtained from the individual(s), and minor(s)&#x2019; legal guardian/next of kin, for the publication of any potentially identifiable images or data included in this article.</p>
</sec>
<sec sec-type="author-contributions" id="sec16">
<title>Author contributions</title>
<p>WY: Conceptualization, Data curation, Methodology, Writing &#x2013; original draft, Writing &#x2013; review &#x0026; editing. SX: Data curation, Formal analysis, Writing &#x2013; review &#x0026; editing. XD: Data curation, Writing &#x2013; review &#x0026; editing. HF: Methodology, Software, Writing &#x2013; review &#x0026; editing.</p>
</sec>
</body>
<back>
<sec sec-type="funding-information" id="sec17">
<title>Funding</title>
<p>The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.</p>
</sec>
<sec sec-type="COI-statement" id="sec18">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec sec-type="disclaimer" id="sec19">
<title>Publisher's note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<fn-group>
<fn id="fn0001"><p><sup>1</sup><ext-link xlink:href="http://www.hbsc.org" ext-link-type="uri">www.hbsc.org</ext-link></p></fn>
</fn-group>
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