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<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Psychiatry</journal-id>
<journal-title-group>
<journal-title>Frontiers in Psychiatry</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Psychiatry</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">1664-0640</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
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<article-meta>
<article-id pub-id-type="doi">10.3389/fpsyt.2026.1737793</article-id>
<article-version article-version-type="Version of Record" vocab="NISO-RP-8-2008"/>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Original Research</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>The interplay between attention deficit/hyperactivity disorder and internet addiction: executive dysfunction and insomnia as mediators and the role of physical activity</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Liu</surname><given-names>Fangtai</given-names></name>
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<contrib contrib-type="author">
<name><surname>Zhong</surname><given-names>Liping</given-names></name>
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<contrib contrib-type="author">
<name><surname>Chen</surname><given-names>Haiyu</given-names></name>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
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<contrib contrib-type="author">
<name><surname>Teng</surname><given-names>Ziwei</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
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<contrib contrib-type="author">
<name><surname>Su</surname><given-names>Yuhan</given-names></name>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
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<contrib contrib-type="author">
<name><surname>Chen</surname><given-names>Jinliang</given-names></name>
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<contrib contrib-type="author" corresp="yes">
<name><surname>Qin</surname><given-names>Yue</given-names></name>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>*</sup></xref>
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<contrib contrib-type="author" corresp="yes">
<name><surname>Luo</surname><given-names>Qiong</given-names></name>
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<xref ref-type="corresp" rid="c001"><sup>*</sup></xref>
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<aff id="aff1"><label>1</label><institution>Department of Psychiatry, Brain Hospital of Hunan Province (The Second People&#x2019;s Hospital of Hunan Province), The School of Clinical Medicine, Hunan University of Chinese Medicine</institution>, <city>Changsha</city>,&#xa0;<country country="cn">China</country></aff>
<aff id="aff2"><label>2</label><institution>College of Physical Education, Hunan University of Technology</institution>, <city>Zhuzhou</city>,&#xa0;<country country="cn">China</country></aff>
<aff id="aff3"><label>3</label><institution>Department of Psychiatry, National Clinical Research Center for Mental Disorders, and National Center for Mental Disorders, The Second Xiangya Hospital of Central South University</institution>, <city>Changsha</city>,&#xa0;<country country="cn">China</country></aff>
<aff id="aff4"><label>4</label><institution>Clinical Psychology Department, Shenzhen Hospital of Integrated Traditional Chinese and Western Medicine</institution>, <city>Shenzhen</city>,&#xa0;<country country="cn">China</country></aff>
<aff id="aff5"><label>5</label><institution>Shenzhen Clinical College of Integrated Chinese and Western Medicine, Guangzhou University of Chinese Medicine</institution>, <city>Shenzhen</city>,&#xa0;<country country="cn">China</country></aff>
<author-notes>
<corresp id="c001"><label>*</label>Correspondence: Yue Qin, <email xlink:href="mailto:qinyue@csu.edu.cn">qinyue@csu.edu.cn</email>; Qiong Luo, <email xlink:href="mailto:1620844511@qq.com">1620844511@qq.com</email></corresp>
</author-notes>
<pub-date publication-format="electronic" date-type="pub" iso-8601-date="2026-02-03">
<day>03</day>
<month>02</month>
<year>2026</year>
</pub-date>
<pub-date publication-format="electronic" date-type="collection">
<year>2026</year>
</pub-date>
<volume>17</volume>
<elocation-id>1737793</elocation-id>
<history>
<date date-type="received">
<day>06</day>
<month>11</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>16</day>
<month>01</month>
<year>2026</year>
</date>
<date date-type="rev-recd">
<day>15</day>
<month>01</month>
<year>2026</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#xa9; 2026 Liu, Zhong, Chen, Teng, Su, Chen, Qin and Luo.</copyright-statement>
<copyright-year>2026</copyright-year>
<copyright-holder>Liu, Zhong, Chen, Teng, Su, Chen, Qin and Luo</copyright-holder>
<license>
<ali:license_ref start_date="2026-02-03">https://creativecommons.org/licenses/by/4.0/</ali:license_ref>
<license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License (CC BY)</ext-link>. 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.</license-p>
</license>
</permissions>
<abstract>
<sec>
<title>Background</title>
<p>Attention Deficit/Hyperactivity Disorder (ADHD) and internet addiction (IA) are common among college students and often co-exist. This study investigated the relationship between ADHD symptoms, executive dysfunction, insomnia, and IA in Chinese college students.</p>
</sec>
<sec>
<title>Methods</title>
<p>A cross-sectional study was conducted in June 2024 at six universities in Hunan Province, China. Demographic data and symptoms of ADHD, IA, executive dysfunction, insomnia, and physical activity were collected via interviews and self-reported questionnaires. Physical activity level was further quantified and categorized using metabolic equivalents (METs) method. Mediation models were performed to explore the path from ADHD to IA and the role of physical activity in IA symptoms.</p>
</sec>
<sec>
<title>Results</title>
<p>Among 1925 students, 12.52% had ADHD symptoms, and 14.03% had IA symptoms. ADHD symptoms were related to IA symptoms (total effects: 0.38, p &lt; 0.001; direct effect: 0.111, p = 0.003), mediated by insomnia (0.161, p &lt; 0.001) and executive dysfunction (0.108, p &lt; 0.001). Compared with no physical activity, moderate-level and high-level physical activities were negatively correlated with IA symptoms, with total relative standardized effects of -0.18 (p = 0.001) and -0.42 (p&lt;0.001), respectively. The relative direct effect of high physical activity levels on IA symptoms was -0.29 (p&lt;0.001), regardless of mediation by insomnia (-0.056 (95%CI, -0.094 to -0.021)) and executive dysfunction (-0.067 (95%CI, -0.105 to -0.033)).</p>
</sec>
<sec>
<title>Conclusion</title>
<p>ADHD and IA symptoms are prevalent among Chinese college students. Executive dysfunction and insomnia mediate the relationship between ADHD and IA symptoms. Moderate and high-level physical activities were associated with reduced risk of IA symptoms, mediated by executive dysfunction and insomnia. Physical activity may help mitigate IA symptoms in college students.</p>
</sec>
</abstract>
<kwd-group>
<kwd>ADHD</kwd>
<kwd>executive dysfunction</kwd>
<kwd>insomnia</kwd>
<kwd>internet addiction</kwd>
<kwd>physical activity</kwd>
</kwd-group>
<funding-group>
<funding-statement>The author(s) declared financial support was received for this work and/or its publication. The study was funded by a grant from the Hunan Provincial Natural Science Foundation Enterprise Joint Fund (No. 2025JJ90300), the Hunan Provincial Natural Science Foundation (No. 2023JJ30333), and the Scientific Research Project of Guangdong Provincial Administration of Traditional Chinese Medicine(Project No. 20222200).</funding-statement>
</funding-group>
<counts>
<fig-count count="3"/>
<table-count count="3"/>
<equation-count count="0"/>
<ref-count count="55"/>
<page-count count="10"/>
<word-count count="4449"/>
</counts>
<custom-meta-group>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Addictive Disorders</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body>
<sec id="s1" sec-type="intro">
<label>1</label>
<title>Introduction</title>
<p>Attention Deficit/Hyperactivity Disorder (ADHD) is a prevalent neurodevelopmental disorder characterized by developmentally inappropriate levels of inattention, hyperactivity, emotional impulsivity, cognitive deficits, and associated learning difficulties (<xref ref-type="bibr" rid="B1">1</xref>). A comprehensive meta-analysis indicates that approximately 6.26% of Chinese children and adolescents meet criteria for ADHD, consistent with estimated global prevalence (<xref ref-type="bibr" rid="B2">2</xref>). ADHD symptoms, although typically emerging in childhood, can persist into adulthood. Many adults currently exhibit clinically significant ADHD symptoms, although they did not fully meet diagnostic criteria for ADHD during childhood (<xref ref-type="bibr" rid="B3">3</xref>, <xref ref-type="bibr" rid="B4">4</xref>). Adult ADHD causes problems in academic performance, work, and family relationships, leading to increased individual burden and financial pressure on families and society (<xref ref-type="bibr" rid="B5">5</xref>, <xref ref-type="bibr" rid="B6">6</xref>). Additionally, individuals with ADHD often have comorbid psychiatric conditions, such as obsessive-compulsive disorder, sleep disturbances, and anxiety disorders (<xref ref-type="bibr" rid="B7">7</xref>&#x2013;<xref ref-type="bibr" rid="B9">9</xref>). Consequently, ADHD has raised considerable public health concerns.</p>
<p>Internet addiction (IA) has emerged as a significant public health issue in the digitalized society, characterized by an overwhelming urge to use the internet and an inability to control usage duration (<xref ref-type="bibr" rid="B10">10</xref>). Studies indicate ADHD and internet addiction (IA) are closely correlated, and people with ADHD are more likely to develop IA (<xref ref-type="bibr" rid="B11">11</xref>, <xref ref-type="bibr" rid="B12">12</xref>). People with IA tend to have poorer mental health and worse self-esteem (<xref ref-type="bibr" rid="B13">13</xref>). Teenagers with ADHD symptoms, in particular, may be more likely to develop IA due to poor social skills and increased depressive tendencies. Additionally, IA can reduce sleep quality by shortening sleep duration (<xref ref-type="bibr" rid="B14">14</xref>). According to research by Li and his colleagues, people with ADHD may be more susceptible to developing an addiction to online activities due to their impulsivity and concentration problems (<xref ref-type="bibr" rid="B15">15</xref>). Furthermore, a study conducted by Chou and his colleagues revealed that for individuals with ADHD, social challenges may prompt the use of online interactions as a compensatory strategy, thereby increasing the risk for IA (<xref ref-type="bibr" rid="B16">16</xref>). Demirta&#x15f; and colleagues found that people with ADHD often experience mental health issues like anxiety and depression, which are closely related to IA (<xref ref-type="bibr" rid="B17">17</xref>). People showing signs of depression might use online activities as a way to escape from reality, thereby worsening their IA (<xref ref-type="bibr" rid="B18">18</xref>). Ko et&#xa0;al. noted that individuals with ADHD in urban areas may face higher level of stress and less social support, making them more vulnerable to developing an IA. This situation is particularly relevant in the context of Chinese universities (<xref ref-type="bibr" rid="B19">19</xref>). As the country with the world&#x2019;s largest online population, China has developed a highly integrated digital environment. Widely used platforms such as Honor of Kings, WeChat, and Douyin are deeply woven into everyday life, which may increase users&#x2019; vulnerability to internet addiction (<xref ref-type="bibr" rid="B20">20</xref>, <xref ref-type="bibr" rid="B21">21</xref>). Despite substantial evidence demonstrating the frequent co-occurrence of ADHD and IA, the precise directional relationship between these conditions remains unclear.</p>
<p>Executive dysfunction, a common comorbidity of ADHD, affects domains such as working memory, planning, attentional control, and inhibitory control, which are prevalent among individuals with ADHD (<xref ref-type="bibr" rid="B22">22</xref>). A long-term study suggests that these issues with executive function, especially problems with impulse control and self-regulation, may put people with ADHD at a higher risk for IA (<xref ref-type="bibr" rid="B23">23</xref>). Furthermore, insomnia, commonly seen in ADHD patients, may exacerbate their executive function challenges (<xref ref-type="bibr" rid="B24">24</xref>, <xref ref-type="bibr" rid="B25">25</xref>). However, current studies typically focused on these factors separately, with limited consideration of their interplay, thus leaving their complex interactions underexplored.</p>
<p>Physical activity, as a non-pharmacological intervention, has been shown to effectively reduce symptoms of IA and improve related mental health outcomes in randomized controlled trials (<xref ref-type="bibr" rid="B26">26</xref>). Additionally, physical activity may also mitigate deficits in executive functioning and alleviate insomnia (<xref ref-type="bibr" rid="B27">27</xref>). However, its role as a potential factor in preventing IA risk has not been quantitatively evaluated.</p>
<p>Building on this foundation, we hypothesized that ADHD symptoms, executive dysfunction, and insomnia shared an intrinsic link with IA symptoms and that physical activity was correlated with these conditions. Firstly, we investigated the occurrence of ADHD and IA symptoms among Chinese college students through a cross-sectional study. Then, we evaluated and refined our proposed framework linking ADHD symptoms, executive dysfunction, insomnia, and IA symptoms, by using structural equation modeling (SEM). Finally, we explored the role of physical activity in these relationships. We aimed to explore the mediating effects of executive dysfunction and insomnia between ADHD and IA symptoms and the role of different intensities of physical activity on IA.</p>
</sec>
<sec id="s2" sec-type="materials|methods">
<label>2</label>
<title>Materials and methods</title>
<sec id="s2_1">
<label>2.1</label>
<title>Participants</title>
<p>A cross-sectional study was undertaken among students sampled from six scientific and technology universities in Hunan Province, China. Individuals were included if they (a) were currently enrolled university students aged 16 years or older, (b) demonstrated the cognitive and linguistic capacity to complete the assessment, and (c) were willing to provide documented informed consent. Of the 2,188 students approached, 263 were excluded for not completing all questions. As a result, 1,925 students were included in the study.</p>
</sec>
<sec id="s2_2">
<label>2.2</label>
<title>Procedures</title>
<p>All participants received the surveys from their teachers in June 2024. Clear instructions were provided throughout the questionnaire. Teachers received professional instruction from experienced psychiatric specialists to help participants understand each question&#x2019;s purpose and content, and they offered crucial assistance during survey completion to clarify any misunderstandings or uncertainties. All participants provided informed consent, and participation was entirely voluntary. The study was approved by the Ethics Committee of the Brain Hospital of Hunan Province (2024K008), and all procedures were carried out in accordance with the ethical principles outlined in the Declaration of Helsinki. To protect privacy and encourage honest responses, the survey was conducted anonymously.</p>
</sec>
<sec id="s2_3">
<label>2.3</label>
<title>Clinical measures</title>
<p>Demographic information</p>
<p>Basic demographic data collected included the students&#x2019; age, sex, and their grades.</p>
<sec id="s2_3_1">
<label>2.3.1</label>
<title>Adult ADHD SELF-REPORT SCALE</title>
<p>The ASRS comprises 18 items, each with five possible responses: never, rarely, occasionally, often, and very often. This study used a binary scoring method suggested by Kessler et&#xa0;al., where each question was scored as either 0 or 1 based on symptom severity (<xref ref-type="bibr" rid="B28">28</xref>). The scale has two subscales&#x2014;nine for inattention and nine for hyperactivity&#x2014;each with possible scores ranging from 0 to 9. A score of 1 is given if the answer indicates clinically significant symptoms; otherwise, it is scored as 0. Seven questions have clinical relevance when answered as sometimes, often, or very often, while the other 11 require answers of frequently or very frequently to be clinically relevant. Based on DSM-5 criteria, this scale yields high specificity in identifying adult ADHD symptoms and demonstrates acceptable internal consistency, with reported Cronbach&#x2019;s &#x3b1; between 0.63 and 0.72 (<xref ref-type="bibr" rid="B29">29</xref>). In this study, the ASRS was used as an ADHD screening tool, with a total score greater than nine indicating clinical level ADHD symptoms, consistent with previous studies (<xref ref-type="bibr" rid="B30">30</xref>).</p>
</sec>
<sec id="s2_3_2">
<label>2.3.2</label>
<title>Barkley Deficits in executive functioning scale, short form</title>
<p>The BDEFS-SF is a shortened version of the 89-item BDEFS, consisting of 20 items that measure executive dysfunction through self-report (<xref ref-type="bibr" rid="B31">31</xref>). Each item uses a four-point Likert scale (<xref ref-type="bibr" rid="B1">1</xref>&#x2013;<xref ref-type="bibr" rid="B4">4</xref>) based on how often symptoms occur: never or seldom, sometimes, often, and always. Scores range from 18 to 72, with higher scores indicating more severe executive function (EF) problems (<xref ref-type="bibr" rid="B32">32</xref>). The BDEFS-SF has a Cronbach&#x2019;s alpha coefficient of 0.94, indicating excellent internal consistency (<xref ref-type="bibr" rid="B32">32</xref>).</p>
</sec>
<sec id="s2_3_3">
<label>2.3.3</label>
<title>Athens insomnia scale</title>
<p>The AIS-8 is an eight-item self-assessment tool designed to evaluate sleep issues according to ICD-10 criteria. The first five items address sleep induction, nighttime awakenings, final awakenings, overall sleep duration, and sleep quality, while the final three items assess functioning capacity, well-being, and daytime sleepiness (<xref ref-type="bibr" rid="B33">33</xref>). The AIS-8 is a four-point Likert scale and has a total score ranging from 0 to 24. This scale demonstrates high internal consistency with a Cronbach&#x2019;s &#x3b1; of 0.89, and a cutoff score of 6, suggesting an elevated risk of insomnia.</p>
</sec>
<sec id="s2_3_4">
<label>2.3.4</label>
<title>Chinese internet addiction scale-revision</title>
<p>The CIAS-R is a 19-item self-report questionnaire that evaluates IA symptoms across four categories: tolerance, compulsive use and withdrawal, interpersonal and health-related issues, and time management concerns (<xref ref-type="bibr" rid="B34">34</xref>). Each item is rated on a four-point Likert scale, yielding a total score ranging from 19 to 76. A score above 53 is indicative of clinically significant IA symptoms. The CIAS-R has shown strong validity and reliability in China, with a Cronbach&#x2019;s alpha of 0.96 (<xref ref-type="bibr" rid="B34">34</xref>).</p>
</sec>
<sec id="s2_3_5">
<label>2.3.5</label>
<title>Metabolic equivalents</title>
<p>Metabolic equivalent (MET) is a common method to express physical activity levels as multiples of resting metabolic rate (RMR) (<xref ref-type="bibr" rid="B35">35</xref>). Our survey included physical activity-related questions, covering frequency, duration, and types of activities. MET values were calculated based on participant responses using the method described by Pearce et&#xa0;al. (<xref ref-type="bibr" rid="B36">36</xref>) and converted into persistent marginal MET-hours (mMET-h). We then categorized participants into low, medium, and high physical activity groups using quartiles and compared them against a group that did not engage in regular physical exercise.</p>
</sec>
</sec>
<sec id="s2_4">
<label>2.4</label>
<title>Statistics</title>
<p>The Kolmogorov&#x2013;Smirnov test was used to assess normality of continuous variables. All rating scales were non-normally distributed. The &#x3c7;2 test was then utilized for categorical data, while the Mann-Whitney U test was utilized to investigate differences in quantitative variables. A structural equation model (SEM) was employed to evaluate the mediating effects of executive dysfunction and insomnia on the association between ADHD and IA symptoms. Spearman correlations were used as the basis for SEM. To be considered acceptable, the SEM had to meet the following criteria: Tucker&#x2013;Lewis&#x2019;s index (TLI) &gt; 0.95, standardized root mean square residual (SRMR) &lt; 0.08, comparative fit index (CFI) &gt; 0.95, and root mean square error of approximation (RMSEA) &lt; 0.08 (<xref ref-type="bibr" rid="B37">37</xref>, <xref ref-type="bibr" rid="B38">38</xref>). All analyses were conducted using R. Studio and SPSS 26.0 (IBM, Inc., Chicago), with a two-tailed significance level of 0.05.</p>
</sec>
</sec>
<sec id="s3" sec-type="results">
<label>3</label>
<title>Results</title>
<sec id="s3_1">
<label>3.1</label>
<title>Demographic and clinical characteristics</title>
<p>After excluding 263 of the 2,188 college students who participated in the survey, the response rate was 87.98%. <xref ref-type="table" rid="T1"><bold>Table&#xa0;1</bold></xref> presented the sociodemographic and clinical characteristics of the participants, including 703 (36.5%) females and 1,222 (63.5%) males. Among them, 14.03% (270 out of 1,925) were identified as having IA symptoms, and 12.52% (241 out of 1925) had ADHD symptoms. The sociodemographic and clinical traits of students with and without IA symptoms was shown in <xref ref-type="table" rid="T1"><bold>Table&#xa0;1</bold></xref>. Univariate logistic regression was used for all variables, with the &#x3c7;2 test applied to categorical data and the Mann-Whitney U test for quantitative variables. No statistically significant differences were observed in age, sex, or grade level between the two groups (all p &gt; 0.05).</p>
<table-wrap id="T1" position="float">
<label>Table&#xa0;1</label>
<caption>
<p>Demographics and clinical symptoms between participants with and without internet addiction.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="center" rowspan="2">Variables</th>
<th valign="middle" align="center"/>
<th valign="middle" colspan="2" align="center">Internet addiction</th>
<th valign="middle" align="center"/>
</tr>
<tr>
<th valign="middle" align="center">Overall</th>
<th valign="middle" align="center">No</th>
<th valign="middle" align="center">Yes</th>
<th valign="middle" align="center">p-value</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="middle" align="left"/>
<td valign="middle" align="left">(N = 1925)</td>
<td valign="middle" align="left">(N = 1655)</td>
<td valign="middle" align="left">(N = 270)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left"/>
<td valign="middle" align="left">N (%)</td>
<td valign="middle" align="left">N (%)</td>
<td valign="middle" align="left">N (%)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Sex</td>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;male</td>
<td valign="middle" align="left">1222 (63.5)</td>
<td valign="middle" align="left">1047 (63.3)</td>
<td valign="middle" align="left">175 (64.8)</td>
<td valign="middle" align="left">0.634<sup>a</sup></td>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;female</td>
<td valign="middle" align="left">703 (36.5)</td>
<td valign="middle" align="left">608 (36.7)</td>
<td valign="middle" align="left">95 (35.2)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Grade</td>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;freshman</td>
<td valign="middle" align="left">1161 (60.3)</td>
<td valign="middle" align="left">992 (59.9)</td>
<td valign="middle" align="left">169 (62.6)</td>
<td valign="middle" align="left">0.233<sup>a</sup></td>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;sophomore</td>
<td valign="middle" align="left">446 (23.2)</td>
<td valign="middle" align="left">379 (22.9)</td>
<td valign="middle" align="left">67 (24.8)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;junior</td>
<td valign="middle" align="left">299 (15.5)</td>
<td valign="middle" align="left">268 (16.2)</td>
<td valign="middle" align="left">31 (11.5)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;senior</td>
<td valign="middle" align="left">19 (1.0)</td>
<td valign="middle" align="left">16 (1)</td>
<td valign="middle" align="left">3 (1.1)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Exercise habit</td>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left">0.027<sup>a</sup></td>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;No</td>
<td valign="middle" align="left">771 (40.1)</td>
<td valign="middle" align="left">646 (39)</td>
<td valign="middle" align="left">125 (46.3)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;Yes</td>
<td valign="middle" align="left">1154 (59.9)</td>
<td valign="middle" align="left">1009 (61)</td>
<td valign="middle" align="left">145 (53.7)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Exercise type</td>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;None</td>
<td valign="middle" align="left">771 (40.1)</td>
<td valign="middle" align="left">646 (39)</td>
<td valign="middle" align="left">125 (46.3)</td>
<td valign="middle" align="left">0.058<sup>a</sup></td>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;High intensity, MET</td>
<td valign="middle" align="left">513 (26.6)</td>
<td valign="middle" align="left">449 (27.1)</td>
<td valign="middle" align="left">64 (23.7)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;Medium intensity, MET</td>
<td valign="middle" align="left">370 (19.2)</td>
<td valign="middle" align="left">321 (19.4)</td>
<td valign="middle" align="left">49 (18.1)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;Medium-high intensity, MET</td>
<td valign="middle" align="left">7 (0.4)</td>
<td valign="middle" align="left">5 (0.3)</td>
<td valign="middle" align="left">2 (0.7)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">&#x2003;Low intensity, MET</td>
<td valign="middle" align="left">264 (13.7)</td>
<td valign="middle" align="left">234 (14.1)</td>
<td valign="middle" align="left">264 (13.7)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left"/>
<td valign="middle" align="left"/>
<td valign="middle" align="left">Mean (SD)</td>
<td valign="middle" align="left">Mean (SD)</td>
<td valign="middle" align="left"/>
</tr>
<tr>
<td valign="middle" align="left">Age, year</td>
<td valign="middle" align="left">19.4 (1.20)</td>
<td valign="middle" align="left">19.4 (1.21)</td>
<td valign="middle" align="left">19.37 (1.11)</td>
<td valign="middle" align="left">0.672<sup>b</sup></td>
</tr>
<tr>
<td valign="middle" align="left">Exercise frequency, times/week</td>
<td valign="middle" align="left">1.5 (1.64)</td>
<td valign="middle" align="left">1.52 (1.64)</td>
<td valign="middle" align="left">1.37 (1.64)</td>
<td valign="middle" align="left">0.065<sup>b</sup></td>
</tr>
<tr>
<td valign="middle" align="left">Time per exercise, min</td>
<td valign="middle" align="left">33.39 (37.2)</td>
<td valign="middle" align="left">34.11 (37.48)</td>
<td valign="middle" align="left">29 (35.17)</td>
<td valign="middle" align="left">0.026<sup>*b</sup></td>
</tr>
<tr>
<td valign="middle" align="left">Time of adherence to exercise, month</td>
<td valign="middle" align="left">5.59 (16.4)</td>
<td valign="middle" align="left">5.81 (17.14)</td>
<td valign="middle" align="left">4.22 (10.95)</td>
<td valign="middle" align="left">0.006<sup>*b</sup></td>
</tr>
<tr>
<td valign="middle" align="left">ASRS total score</td>
<td valign="middle" align="left">4.68 (3.23)</td>
<td valign="middle" align="left">4.29 (3)</td>
<td valign="middle" align="left">7.06 (3.54)</td>
<td valign="middle" align="left">&lt;0.001<sup>***b</sup></td>
</tr>
<tr>
<td valign="middle" align="left">AIS total score</td>
<td valign="middle" align="left">4.74 (3.71)</td>
<td valign="middle" align="left">4.21 (3.3)</td>
<td valign="middle" align="left">7.97 (4.38)</td>
<td valign="middle" align="left">&lt;0.001<sup>***b</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEFS-SF total score</td>
<td valign="middle" align="left">38.06 (12.01)</td>
<td valign="middle" align="left">36.58 (11.11)</td>
<td valign="middle" align="left">47.15 (13.29)</td>
<td valign="middle" align="left">&lt;0.001<sup>***b</sup></td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>MET, metabolic equivalent; ASRS, Adult ADHD Self-Report Scale; AIS, Athens Insomnia Scale; BDEFS-SF, Barkley Deficits in Executive Functioning Scale, Short Form.</p></fn>
<fn>
<p>Statistic methods: a, &#x3c7;<sup>2</sup> test. b, Mann-Whitney test. *p &lt; 0.05. **p &lt; 0.01. ***p &lt; 0.001.</p></fn>
</table-wrap-foot>
</table-wrap>
<p>Students with IA symptoms had lower percentages of exercise habits, engaged in lower intensity exercise, spent less time per exercise session, and showed poorer adherence to exercise routines compared to those without IA symptoms (p &lt; 0.05). Additionally, their scores were significantly higher on the BDEFS-SF, AIS, and overall ASRS (all p &lt; 0.001; <xref ref-type="table" rid="T1"><bold>Table&#xa0;1</bold></xref>). Even after adjusting for factors like age, sex, and grade level, multiple linear regression analysis showed that exercise behaviors, insomnia, executive dysfunction, and ADHD symptoms were strongly linked to IA symptoms (all p &lt; 0.05; <xref ref-type="table" rid="T2"><bold>Table&#xa0;2</bold></xref>).</p>
<table-wrap id="T2" position="float">
<label>Table&#xa0;2</label>
<caption>
<p>Multiple linear regression analysis for variables correlated with internet addiction.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="center">Variables</th>
<th valign="middle" align="center">Unstandardized coefficient, B</th>
<th valign="middle" align="center">Standardized coefficient, Beta</th>
<th valign="middle" align="center">t</th>
<th valign="middle" align="center">p- value</th>
<th valign="middle" align="center">95 CI LL</th>
<th valign="middle" align="center">95 CI UL</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="middle" align="left">Exercise habits</td>
<td valign="middle" align="left">-2.004</td>
<td valign="middle" align="left">-0.09</td>
<td valign="middle" align="left">-4.53</td>
<td valign="middle" align="left">&lt;0.001</td>
<td valign="middle" align="left">-2.871</td>
<td valign="middle" align="left">-1.136</td>
</tr>
<tr>
<td valign="middle" align="left">AIS total scores</td>
<td valign="middle" align="left">0.883</td>
<td valign="middle" align="left">0.301</td>
<td valign="middle" align="left">13.731</td>
<td valign="middle" align="left">&lt;0.001</td>
<td valign="middle" align="left">0.757</td>
<td valign="middle" align="left">1.009</td>
</tr>
<tr>
<td valign="middle" align="left">ASRS total scores</td>
<td valign="middle" align="left">0.39</td>
<td valign="middle" align="left">0.115</td>
<td valign="middle" align="left">5.173</td>
<td valign="middle" align="left">&lt;0.001</td>
<td valign="middle" align="left">0.242</td>
<td valign="middle" align="left">0.537</td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF total scores</td>
<td valign="middle" align="left">0.205</td>
<td valign="middle" align="left">0.226</td>
<td valign="middle" align="left">9.762</td>
<td valign="middle" align="left">&lt;0.001</td>
<td valign="middle" align="left">0.164</td>
<td valign="middle" align="left">0.246</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>The model was adjusted for sex, age, and grade.</p></fn>
<fn>
<p>AIS, Athens Insomnia Scale; ASRS, Adult ADHD Self-Report Scale; BDEFS-SF, Barkley Deficits in Executive Functioning Scale, Short Form.</p></fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="s3_2">
<label>3.2</label>
<title>Pathways from ADHD symptoms to IA symptoms</title>
<p>There were positive correlations between all symptoms and sub-symptoms, including executive dysfunction, insomnia, and ADHD symptoms (all p &lt; 0.01; <xref ref-type="table" rid="T3"><bold>Table&#xa0;3</bold></xref>). The absence of multicollinearity among these factors supported the validity of the subsequent mediation analysis. Model fit indices indicated that the proposed model (<xref ref-type="fig" rid="f1"><bold>Figure&#xa0;1</bold></xref>) fit the data well. The path model (<xref ref-type="fig" rid="f2"><bold>Figure&#xa0;2</bold></xref>) showed a total standardized effect of 0.38 (p &lt; 0.001), indicating a positive correlation between IA and ADHD symptoms.</p>
<table-wrap id="T3" position="float">
<label>Table&#xa0;3</label>
<caption>
<p>Spearman rank correlations between internet addiction, insomnia, executive dysfunction, and ADHD.</p>
</caption>
<table frame="hsides">
<thead>
<tr>
<th valign="middle" align="center">Rho</th>
<th valign="middle" align="center">CIAS-R</th>
<th valign="middle" align="center">CIAS-R-Compulsive use and withdrawal</th>
<th valign="middle" align="center">CIAS-R-Tolerance</th>
<th valign="middle" align="center">CIAS-R-Time management problems</th>
<th valign="middle" align="center">CIAS-R-Interpersonal and health-related problems</th>
</tr>
</thead>
<tbody>
<tr>
<td valign="middle" align="left">AIS total scores</td>
<td valign="middle" align="left">0.449<sup>**</sup></td>
<td valign="middle" align="left">0.405<sup>**</sup></td>
<td valign="middle" align="left">0.389<sup>**</sup></td>
<td valign="middle" align="left">0.409<sup>**</sup></td>
<td valign="middle" align="left">0.436<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">AIS-Nighttime symptoms</td>
<td valign="middle" align="left">0.395<sup>**</sup></td>
<td valign="middle" align="left">0.357<sup>**</sup></td>
<td valign="middle" align="left">0.335<sup>**</sup></td>
<td valign="middle" align="left">0.371<sup>**</sup></td>
<td valign="middle" align="left">0.383<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">AIS-Daytime symptoms</td>
<td valign="middle" align="left">0.432<sup>**</sup></td>
<td valign="middle" align="left">0.390<sup>**</sup></td>
<td valign="middle" align="left">0.387<sup>**</sup></td>
<td valign="middle" align="left">0.376<sup>**</sup></td>
<td valign="middle" align="left">0.424<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">ASRS total scores</td>
<td valign="middle" align="left">0.338<sup>**</sup></td>
<td valign="middle" align="left">0.305<sup>**</sup></td>
<td valign="middle" align="left">0.301<sup>**</sup></td>
<td valign="middle" align="left">0.304<sup>**</sup></td>
<td valign="middle" align="left">0.324<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">Inattention</td>
<td valign="middle" align="left">0.293<sup>**</sup></td>
<td valign="middle" align="left">0.259<sup>**</sup></td>
<td valign="middle" align="left">0.265<sup>**</sup></td>
<td valign="middle" align="left">0.259<sup>**</sup></td>
<td valign="middle" align="left">0.287<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">Hyperactivity</td>
<td valign="middle" align="left">0.305<sup>**</sup></td>
<td valign="middle" align="left">0.283<sup>**</sup></td>
<td valign="middle" align="left">0.268<sup>**</sup></td>
<td valign="middle" align="left">0.283<sup>**</sup></td>
<td valign="middle" align="left">0.285<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF total scores</td>
<td valign="middle" align="left">0.386<sup>**</sup></td>
<td valign="middle" align="left">0.353<sup>**</sup></td>
<td valign="middle" align="left">0.342<sup>**</sup></td>
<td valign="middle" align="left">0.359<sup>**</sup></td>
<td valign="middle" align="left">0.361<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF-Motivation</td>
<td valign="middle" align="left">0.376<sup>**</sup></td>
<td valign="middle" align="left">0.345<sup>**</sup></td>
<td valign="middle" align="left">0.324<sup>**</sup></td>
<td valign="middle" align="left">0.350<sup>**</sup></td>
<td valign="middle" align="left">0.356<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF-Restraint</td>
<td valign="middle" align="left">0.316<sup>**</sup></td>
<td valign="middle" align="left">0.295<sup>**</sup></td>
<td valign="middle" align="left">0.280<sup>**</sup></td>
<td valign="middle" align="left">0.301<sup>**</sup></td>
<td valign="middle" align="left">0.286<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF-Management to time</td>
<td valign="middle" align="left">0.381<sup>**</sup></td>
<td valign="middle" align="left">0.348<sup>**</sup></td>
<td valign="middle" align="left">0.351<sup>**</sup></td>
<td valign="middle" align="left">0.345<sup>**</sup></td>
<td valign="middle" align="left">0.355<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF-Organization</td>
<td valign="middle" align="left">0.354<sup>**</sup></td>
<td valign="middle" align="left">0.328<sup>**</sup></td>
<td valign="middle" align="left">0.314<sup>**</sup></td>
<td valign="middle" align="left">0.315<sup>**</sup></td>
<td valign="middle" align="left">0.339<sup>**</sup></td>
</tr>
<tr>
<td valign="middle" align="left">BDEF-SF-Regulation of emotion</td>
<td valign="middle" align="left">0.355<sup>**</sup></td>
<td valign="middle" align="left">0.328<sup>**</sup></td>
<td valign="middle" align="left">0.308<sup>**</sup></td>
<td valign="middle" align="left">0.333<sup>**</sup></td>
<td valign="middle" align="left">0.331<sup>**</sup></td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>CIAS-R, Chinese Internet Addiction Scale-Revision; AIS, Athens Insomnia Scale; ASRS, Adult ADHD Self-Report Scale; BDEFS-SF, Barkley Deficits in Executive Functioning Scale, Short Form. ** p&lt; 0.01.</p></fn>
</table-wrap-foot>
</table-wrap>
<fig id="f1" position="float">
<label>Figure&#xa0;1</label>
<caption>
<p>The hypothesized model for the association between ADHD and internet addiction. Abbreviations: ADHD, Attention Deficit/Hyperactivity Disorder.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpsyt-17-1737793-g001.tif">
<alt-text content-type="machine-generated">Flowchart showing relationships among ADHD, Internet addiction, Executive function, and Insomnia. ADHD connects to Executive function and Insomnia, forming a cycle with Internet addiction. Arrows indicate influence or correlation.</alt-text>
</graphic></fig>
<fig id="f2" position="float">
<label>Figure&#xa0;2</label>
<caption>
<p>The SEM for the association between internet addiction and ADHD mediated by insomnia and executive dysfunction. Abbreviations: ADHD, Attention Deficit/Hyperactivity Disorder. *p &lt; 0.05. **p &lt; 0.01. ***p &lt; 0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpsyt-17-1737793-g002.tif">
<alt-text content-type="machine-generated">Diagram showing the relationships between ADHD, executive dysfunction, insomnia, and internet addiction. ADHD, influenced by hyperactivity and inattention, affects executive dysfunction, which impacts motivation, restraint, time management, organization, and emotional regulation. ADHD also relates to internet addiction, which involves compulsive use, interpersonal and health issues, time management problems, and tolerance. Insomnia, influenced by ADHD, affects nighttime and daytime symptoms. Path coefficients are included, highlighting statistical significance. Fit indices are RMSEA = 0.025, CFI = 0.976, SRMR = 0.017, TLI = 0.979, p &lt; 0.001.</alt-text>
</graphic></fig>
<p>IA symptoms were directly associated with executive dysfunction, insomnia, and ADHD symptoms, with significant covariation between executive dysfunction and insomnia (all p &lt; 0.001). Specifically, ADHD symptoms had an impact on IA symptoms, with a standardized direct effect of 0.111(p=0.003) and a standardized indirect effect of 0.269 (p &lt; 0.001). The path coefficient measuring the impact of ADHD symptoms on IA symptoms through insomnia was 0.161 (p &lt; 0.001), while executive dysfunction had a coefficient of 0.108 (p &lt; 0.001), indicating that they mediated the effect of ADHD symptoms on IA symptoms.</p>
</sec>
<sec id="s3_3">
<label>3.3</label>
<title>Pathways from physical activity to IA symptoms</title>
<p><xref ref-type="supplementary-material" rid="SM1"><bold>Supplementary Table S1</bold></xref> showed the sociodemographic and clinical traits of students with and without exercise habits. Students with exercise habits had lower total scores on the CIAS-R, AIS, and BDEFS-SF (p &lt; 0.001), were typically in lower grade levels, and were more likely to be male than those without exercise habits. Moderate physical activity levels were negatively associated with IA symptoms, according to the simple mediation analysis model (<xref ref-type="fig" rid="f3"><bold>Figure&#xa0;3</bold></xref>; <xref ref-type="supplementary-material" rid="SM1"><bold>Supplementary Table S2</bold></xref>), with a relative direct standardized effect of -0.11 (p = 0.033) and a relative total standardized effect of -0.18 (p = 0.001) compared to those who did not exercise. The path coefficient from moderate physical activity level to IA symptoms mediated by executive function was -0.052 (95% CI, -0.085 to -0.0197). High levels of physical activity were even more strongly inversely correlated with IA symptoms, with a relative direct standardized effect of -0.29 (p &lt; 0.001) and a relative total standardized effect of -0.42 (p &lt; 0.001) when compared to those who did not exercise regularly. The partial relative mediating effect of insomnia on the path from high levels of physical activity to IA symptoms was -0.056 (95% CI, -0.094 to -0.021), which was -0.067 (95% CI, -0.105 to -0.033) for executive dysfunction. However, low amounts of exercise had no significant impact on IA symptoms when compared to no activity.</p>
<fig id="f3" position="float">
<label>Figure&#xa0;3</label>
<caption>
<p>The association between internet addiction and physical activity level mediated by insomnia and executive dysfunction. *p &lt; 0.05. **p &lt; 0.01. ***p &lt; 0.001.</p>
</caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpsyt-17-1737793-g003.tif">
<alt-text content-type="machine-generated">A path diagram illustrating the relationships between physical activity levels, insomnia, internet addiction, and executive dysfunction. Arrows indicate the associations, with values showing the strength and significance of each. Physical activity intensity shows graded negative associations with outcomes: high activity is linked to lower levels of insomnia (-0.18), internet addiction (-0.29), and executive dysfunction (-0.19). Medium activity is associated only with reduced internet addiction and executive dysfunction, while low activity shows no significant protective associations. Significance levels are denoted by asterisks.</alt-text>
</graphic></fig>
</sec>
</sec>
<sec id="s4" sec-type="discussion">
<label>4</label>
<title>Discussion</title>
<p>In this study, we assessed the prevalence of ADHD and internet addiction (IA) symptoms among Chinese college students, revealing rates of 12.52% for ADHD symptoms and 14.03% for IA symptoms. Findings of structural equation modeling (SEM) demonstrated that executive dysfunction and insomnia jointly mediated the relationship between ADHD and IA symptoms. Specifically, physical activity levels were inversely associated with IA symptoms, with this relationship also being mediated by executive dysfunction and insomnia. These results suggest that executive dysfunction and insomnia serve as key mediators in the pathway from ADHD symptoms to IA, and that physical activity may prevent IA risk by affecting these mediators.</p>
<p>A 2020 meta-analysis reported a global prevalence of 2.58% for persistent adult ADHD and 6.76% for symptomatic adult ADHD (<xref ref-type="bibr" rid="B39">39</xref>). Previous studies reported varying prevalence rates of ADHD among Chinese college students. One study of 8,098 students reported a prevalence of 7.26%, whereas another involving 5,693 students found 3.5% (<xref ref-type="bibr" rid="B40">40</xref>, <xref ref-type="bibr" rid="B41">41</xref>). The prevalence of ADHD symptoms in our sample was 1.7 to 3.6 times higher than those reported in previous studies. This discrepancy may be attributed to variations in sample size and the scoring method employed in the ASRS.</p>
<p>Research indicates that the prevalence of IA among Chinese university students reaches 7.7% (<xref ref-type="bibr" rid="B42">42</xref>). Epidemiological evidence also indicates a high prevalence of IA within the general Chinese population, especially among adolescents (<xref ref-type="bibr" rid="B43">43</xref>). This suggests that IA symptoms may occur in individuals without pre-existing conditions, potentially explaining the high detection rate of IA symptoms among college students in our study. Another study involving 8,098 Chinese college students revealed that the prevalence rates of IA were 7.21% in males and 8.17% in females (<xref ref-type="bibr" rid="B40">40</xref>). In our study, the detection rate of IA symptoms among college students was found to be relatively high, with a prevalence rate of 14.03%. A South Korean study investigating the relationship between ADHD and IA suggested that IA might be more closely associated with the cognitive and behavioral symptoms of ADHD rather than ADHD diagnosis, and the comorbidity between ADHD and IA might be linked to functional and structural brain abnormalities associated with excessive and pathological internet use (<xref ref-type="bibr" rid="B44">44</xref>). These findings collectively indicate that the related dysfunctions in ADHD symptoms are highly likely to lead to disordered internet use.</p>
<p>Effective interventions for individuals with ADHD symptoms could help them in managing their internet use. Our SEM analysis revealed that executive dysfunction serves as a mediator in the relationship between ADHD and IA symptoms. Symptoms of ADHD can lead to difficulties in planning, organization, and time management, which are characteristics of executive dysfunction (<xref ref-type="bibr" rid="B45">45</xref>). This dysfunction may impair self-regulation and task management, leading individuals to engage in internet activities as an escape from real-world challenges (<xref ref-type="bibr" rid="B46">46</xref>). Therefore, executive dysfunction stemming from ADHD symptoms may increase reliance on the internet, supporting our findings and confirming its mediating role in the ADHD-IA symptoms relationship. Notably, moderate online gaming has been shown to enhance executive function in college students, while excessive use at subclinical levels may similarly impair it (<xref ref-type="bibr" rid="B47">47</xref>). Consequently, clinical interventions should adopt a differentiated perspective that acknowledges and accounts for the potential compensatory or functional benefits of internet use.</p>
<p>Another potential mediating factor observed in this study was insomnia. A study focusing on pediatric ADHD patients found that sleep disturbances like insomnia are frequently observed comorbidities in this population (<xref ref-type="bibr" rid="B48">48</xref>). Furthermore, Grant et&#xa0;al. reported that insomnia may indirectly contribute to the onset and progression of IA by impairing emotional regulation and impulse control (<xref ref-type="bibr" rid="B49">49</xref>). Convergent evidence from the literature and our study confirms that insomnia is a significant mediator in the pathway from ADHD symptoms to IA.</p>
<p>Moreover, this study found that high-level physical activity was negatively associated with IA symptoms, which were mediated by insomnia and executive dysfunction. These findings align with previous research. For instance, A 2015 meta-analysis identified physical activity functions as a comprehensive intervention that directly reduces the risk of IA while also providing indirect protection through the enhancement of mental health (<xref ref-type="bibr" rid="B50">50</xref>). Additionally, a systematic review by Alimoradi et&#xa0;al. reported a significant association between IA and sleep disturbances and noted that physical activity improves sleep quality, thereby indirectly reducing IA risk (<xref ref-type="bibr" rid="B51">51</xref>). Other studies further suggest that physical activity may alleviate IA symptoms and reduce its incidence (<xref ref-type="bibr" rid="B52">52</xref>&#x2013;<xref ref-type="bibr" rid="B54">54</xref>). Notably, our study identified that moderate-to-high levels of physical activity were associated with a reduced risk of IA, thereby offering a supplement to previous findings in the field. However a 2023 multinational study found that among university students in Portugal and Poland, those with a history of SARS-CoV-2 infection, particularly in cases of recurrent infection, exhibited an elevated risk of internet addiction, when regularly engaging in physical activity (<xref ref-type="bibr" rid="B55">55</xref>). We speculated that this phenomenon may be associated with regional factors and the impact of COVID-19.</p>
<p>The findings of this study yielded significant clinical and public health insights. First, this study established the prevalence of internet addiction among Chinese college students through a large-scale survey. Second, the application of validated psychometric instruments and SEM allowed for the empirical validation of a multidimensional interaction model that incorporates ADHD symptoms, executive dysfunction, insomnia, and IA. The analysis confirmed the direct effect of ADHD symptoms on IA and identified an indirect pathway mediated by executive dysfunction and insomnia. It also revealed that physical activity intensity moderated the risk of IA. Third, the findings highlighted the need to address both neuropsychological factors, such as executive function and sleep disturbances, and modifiable lifestyle factors, such as physical activity of appropriate intensity, in the design of intervention strategies. This cross-sectional evidence offers preliminary insights that could inform the development of integrated intervention frameworks aimed at reducing IA risk among college students.</p>
<p>The current study has several limitations. First, using self-reported scales may lead to recall bias and reporting bias. Second, the sample was recruited from six universities in Hunan Province, limiting the generalizability of the findings. Third, the cross-sectional design could not determine the causal relationships among these variables. Finally, potentially relevant confounders like mood symptoms or medication were not considered in this study. Future longitudinal studies should incorporate other comorbid psychopathological conditions as confounders and elucidate possible bidirectional and dynamic interplay between ADHD symptoms and IA.</p>
</sec>
<sec id="s5" sec-type="conclusions">
<label>5</label>
<title>Conclusion</title>
<p>This study demonstrates that IA symptoms are highly prevalent among Chinese college students and are associated with ADHD symptoms. Furthermore, our findings highlight the mediating roles of executive dysfunction and insomnia in the relationship between ADHD symptoms and IA symptoms. These results underscore the importance of addressing these modifiable factors in clinical and educational settings. Caregivers and healthcare providers should consider integrating assessments of executive functioning, sleep quality, and physical activity into interventions for students with IA symptoms to optimize outcomes.</p>
</sec>
</body>
<back>
<sec id="s6" sec-type="data-availability">
<title>Data availability statement</title>
<p>The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.</p></sec>
<sec id="s7" sec-type="ethics-statement">
<title>Ethics statement</title>
<p>The studies involving humans were approved by The Ethics Committee of the Brain Hospital of Hunan Province. The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.</p></sec>
<sec id="s8" sec-type="author-contributions">
<title>Author contributions</title>
<p>FL: Formal Analysis, Writing &#x2013; original draft, Writing &#x2013; review &amp; editing. LZ: Methodology, Project administration, Writing &#x2013; original draft. HC: Investigation, Methodology, Writing &#x2013; original draft. ZT:&#xa0;Formal Analysis, Investigation, Writing &#x2013; original draft. YS:&#xa0;Conceptualization, Data curation, Writing &#x2013; original draft.&#xa0;JC:&#xa0;Data curation, Funding acquisition, Writing &#x2013; original draft. YQ: Supervision, Writing &#x2013; original draft, Writing &#x2013; review &amp;&#xa0;editing. QL: Funding acquisition, Supervision, Writing &#x2013; review&#xa0;&amp; editing.</p></sec>
<ack>
<title>Acknowledgments</title>
<p>We extend our appreciation to all patients and staff for their involvement and support.</p>
</ack>
<sec id="s10" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>The author(s) declared that this work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p></sec>
<sec id="s11" sec-type="ai-statement">
<title>Generative AI statement</title>
<p>The author(s) declared that generative AI was not used in the creation of this manuscript.</p>
<p>Any alternative text (alt text) provided alongside figures in this article has been generated by Frontiers with the support of artificial intelligence and reasonable efforts have been made to ensure accuracy, including review by the authors wherever possible. If you identify any issues, please contact us.</p></sec>
<sec id="s12" sec-type="disclaimer">
<title>Publisher&#x2019;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>
<sec id="s13" sec-type="supplementary-material">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fpsyt.2026.1737793/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fpsyt.2026.1737793/full#supplementary-material</ext-link></p>
<supplementary-material xlink:href="Table1.docx" id="SM1" mimetype="application/vnd.openxmlformats-officedocument.wordprocessingml.document"/></sec>
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<p>Edited by: <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/9038">Marc N. Potenza</ext-link>, Yale University, United States</p></fn>
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