背景:本案例研究旨在描述8天越野山地自行车赛段后神经肌肉激活和协同作用的潜在变化。
方法:在比赛前5天进行了峰值功率输出测试。比赛开始前两天和7天后,运动员进行了基于力量的Lamberts次最大自行车测试,包括表面肌电图,并完成了每日运动员生活需求分析问卷。神经肌肉激活,就均方根而言,肌肉激活的时间(开始-偏移),和协同作用,是从肌电图记录中获得的。
结果:运动员在每日运动员生活需求分析问卷中报告了赛段比赛后经历的压力症状增加。阶段性比赛后,股二头肌和胫骨前肌的归一化幅度均降低。此外,描述神经肌肉激活所需的协同作用数量从2增加到3.
结论:在本案例研究中,协同效应的增加表明,在舞台比赛之后,运动员表现出更复杂的肌肉募集模式。这可能表明,当肌肉疲劳发生时,肌肉协调可以改变;然而,需要进一步的研究来在更大的样本中证实这些结果.
BACKGROUND: This
case study aimed to describe potential changes in neuromuscular activation and synergies after an 8-day cross-country mountain-bike stage race.
METHODS: A peak power output test was performed 5 days before the race. Two days before the start and after 7 days of racing, the athlete performed a power-based Lamberts Submaximal Cycling Test, including surface electromyography, and completed a Daily Analysis of Life Demands of Athletes questionnaire. Neuromuscular activation, in terms of root mean square, timing (onset-offset) of muscle activation, and synergies, was obtained from electromyography recordings.
RESULTS: The athlete reported an increase in symptoms of experienced stress after the stage race on the Daily Analysis of Life Demands of Athletes questionnaire. Both biceps femoris and tibialis anterior muscles showed a reduction in normalized amplitude after the stage race. In addition, the number of synergies that was necessary to describe neuromuscular activation increased from 2 to 3.
CONCLUSIONS: In this
case study, the increase in synergies suggests that, after the stage race, the athlete showed a more complex muscle-recruitment pattern. This may indicate that muscle coordination can change when muscle fatigue occurs; however, further research is needed to confirm these results in a larger sample.