Front. Physiol. Frontiers in Physiology Front. Physiol. 1664-042X Frontiers Media S.A. 1793994 10.3389/fphys.2026.1793994 Retraction Retraction: The impact of COVID-19 and muscle fatigue on cardiorespiratory fitness and running kinetics in female recreational runners Frontiers Editorial Office 10.3389/fphys.2026.1793994 Frontiers Editorial Office * Correspondence: Frontiers Editorial Office, research.integrity@frontiersin.org 06 02 2026 2026 17 1793994 22 01 2026 22 01 2026 Copyright © 2026 Frontiers Editorial Office. 2026 Frontiers Editorial Office https://creativecommons.org/licenses/by/4.0/ 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. A Retraction of the Original Research Article The impact of COVID-19 and muscle fatigue on cardiorespiratory fitness and running kinetics in female recreational runners by Jafarnezhadgero AA, Noroozi R, Fakhri E, Granacher U and Oliveira AS (2022). Front. Physiol. 13:942589. doi: 10.3389/fphys.2022.942589 section-at-acceptance Exercise Physiology

Following publication, concerns were raised regarding the ethical approval procedure, recruitment, and methodology of the study that failed to adequately ensure the safety of previously hospitalised COVID-19 patients. An investigation was conducted in accordance with Frontiers’ policies.

The authors failed to provide a satisfactory explanation, and, as a result, the conclusions of the article have been deemed unreliable, the study has been found not to meet appropriate ethical standards, and the article has been retracted.

This retraction was approved by the Chief Editors of Frontiers in Physiology and the Chief Executive Editor of Frontiers. The authors disagree to this retraction.

Approved by: Giuseppe D’Antona, University of Pavia, Italy