Jafarnezhadgero AmirAli, Moradzadeh Nastaran, Mirzang Ehsan Fakhri, Sajedi Heidar, Dixon Sharon, Akrami Mohammad
Department of Sport Biomechanics, Faculty of Educational Science and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
Faculty of Health Science, Department Exercise and Sports Sciences for Disabled People, International Science and Technology University, Warsaw, Poland.
PLoS One. 2025 May 6;20(5):e0322167. doi: 10.1371/journal.pone.0322167. eCollection 2025.
This study investigates the effects of a fatiguing exercise on lower limb electro-myographic activities and co-contraction in overweight females compared with normal weight females during running.
Forty-eight females were divided into two groups. The first group included individuals with a normal body-mass-index. The second group comprised individuals classified as overweight/obese based on body-mass-index. Electromyography data from the tibialis anterior, gastrocnemius medialis, vastus lateralis, vastus medialis, rectus femoris, biceps femoris, and semitendinosus muscles were collected during running at constant speed using a surface electromyography system before and after a running induced fatigue.
The results indicated significant main effects of the "Group" on tibialis anterior muscle activities during the loading phase (P = 0.040). Furthermore, the results showed significant main effects of "Fatigue" on rectus femoris (P = 0.028) and semitendinosus (P = 0.007) muscle activities during the loading phase. Paired-wise comparison demonstrated significantly greater rectus femoris and semitendinosus activities during the loading phase after the fatigue protocol. The results demonstrated significant main effects of "Fatigue" for general knee muscular co-contraction during early stance phase (P < 0.001). Paired-wise comparison demonstrated significantly greater general knee muscular co-contraction during early stance phase at post-test compared with pre-test. No significant main effect of "Group" and group-by-fatigue interactions were found for general and direct knee co-contraction during early stance phase (P > 0.05).
Overall, our findings indicate that both fatigue and being overweight result in running pattern differences, but these occur through different mechanisms at a neuromuscular level. Neuromuscular responses to fatigue during running in overweight adults and in normal weight adults can be evaluated together, in order to optimize the modality of treatment and rehabilitation processes in overweight adults to reduce and/or prevent the risk of running related injury.
本研究调查了疲劳运动对超重女性与正常体重女性在跑步过程中下肢肌电活动和共同收缩的影响。
48名女性被分为两组。第一组包括身体质量指数正常的个体。第二组由根据身体质量指数分类为超重/肥胖的个体组成。在跑步诱导疲劳前后，使用表面肌电系统在以恒定速度跑步期间收集胫骨前肌、腓肠肌内侧头、股外侧肌、股内侧肌、股直肌、股二头肌和半腱肌的肌电数据。
结果表明，“组别”对加载阶段胫骨前肌活动有显著的主效应（P = 0.040）。此外，结果显示“疲劳”对加载阶段股直肌（P = 0.028）和半腱肌（P = 0.007）的肌肉活动有显著的主效应。配对比较表明，疲劳方案后加载阶段股直肌和半腱肌的活动显著增加。结果表明，“疲劳”对早期站立阶段的一般膝关节肌肉共同收缩有显著的主效应（P < 0.001）。配对比较表明，与测试前相比，测试后早期站立阶段的一般膝关节肌肉共同收缩显著增加。在早期站立阶段，未发现“组别”对一般和直接膝关节共同收缩有显著的主效应以及组别与疲劳的交互作用（P > 0.05）。
总体而言，我们的研究结果表明，疲劳和超重都会导致跑步模式的差异，但这些差异是通过神经肌肉水平的不同机制发生的。可以一起评估超重成年人和正常体重成年人在跑步过程中对疲劳的神经肌肉反应，以优化超重成年人的治疗和康复过程方式，降低和/或预防与跑步相关的损伤风险。
