Jafarnezhadgero Amir Ali, Noroozi Raha, Fakhri Ehsan, Granacher Urs, Oliveira Anderson Souza
Department of Sport Managements and Biomechanics, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
Division of Training and Movement Sciences, Research Focus Cognition Sciences, University of Potsdam, Potsdam, Germany.
Front Physiol. 2022 Jul 18;13:942589. doi: 10.3389/fphys.2022.942589. eCollection 2022.
There is evidence that fully recovered COVID-19 patients usually resume physical exercise, but do not perform at the same intensity level performed prior to infection. The aim of this study was to evaluate the impact of COVID-19 infection and recovery as well as muscle fatigue on cardiorespiratory fitness and running biomechanics in female recreational runners. Twenty-eight females were divided into a group of hospitalized and recovered COVID-19 patients (COV, = 14, at least 14 days following recovery) and a group of healthy age-matched controls (CTR, = 14). Ground reaction forces from stepping on a force plate while barefoot overground running at 3.3 m/s was measured before and after a fatiguing protocol. The fatigue protocol consisted of incrementally increasing running speed until reaching a score of 13 on the 6-20 Borg scale, followed by steady-state running until exhaustion. The effects of group and fatigue were assessed for steady-state running duration, steady-state running speed, ground contact time, vertical instantaneous loading rate and peak propulsion force. COV runners completed only 56% of the running time achieved by the CTR ( < 0.0001), and at a 26% slower steady-state running speed ( < 0.0001). There were fatigue-related reductions in loading rate ( = 0.004) without group differences. Increased ground contact time ( = 0.002) and reduced peak propulsion force ( = 0.005) were found for COV when compared to CTR. Our results suggest that female runners who recovered from COVID-19 showed compromised running endurance and altered running kinetics in the form of longer stance periods and weaker propulsion forces. More research is needed in this area using larger sample sizes to confirm our study findings.
有证据表明，新冠病毒病完全康复的患者通常会恢复体育锻炼，但锻炼强度无法达到感染前的水平。本研究旨在评估新冠病毒病感染与康复以及肌肉疲劳对女性业余跑步者心肺适能和跑步生物力学的影响。28名女性被分为两组，一组是曾住院并已康复的新冠病毒病患者（COV组，n = 14，康复后至少14天），另一组是年龄匹配的健康对照组（CTR组，n = 14）。在疲劳方案前后，测量她们以3.3米/秒的速度在地面赤脚跑步时踩在测力板上产生的地面反作用力。疲劳方案包括逐步提高跑步速度，直到在6 - 20级Borg量表上达到13分，然后进行稳态跑步直至精疲力竭。评估了组别和疲劳对稳态跑步持续时间、稳态跑步速度、地面接触时间、垂直瞬时加载率和最大推进力的影响。COV组跑步者的跑步时间仅为CTR组的56%（P < 0.0001），稳态跑步速度慢26%（P < 0.0001）。加载率存在与疲劳相关的降低（P = 0.004），但两组之间无差异。与CTR组相比，COV组的地面接触时间增加（P = 0.002），最大推进力降低（P = 0.005）。我们的结果表明，从新冠病毒病中康复的女性跑步者表现出跑步耐力受损，以及以更长站立时间和更弱推进力形式出现的跑步动力学改变。该领域需要更多研究，采用更大样本量以证实我们的研究结果。
