Rozand Vianney, Pageaux Benjamin, Marcora Samuele M, Papaxanthis Charalambos, Lepers Romuald
Institut National de la Santé et de la Recherche Médicale U1093, Faculty of Sport Sciences, University of Burgundy Dijon, France.
Institut National de la Santé et de la Recherche Médicale U1093, Faculty of Sport Sciences, University of Burgundy Dijon, France ; Endurance Research Group, School of Sport and Exercise Sciences, University of Kent at Medway Chatham Maritime, UK.
Front Hum Neurosci. 2014 Sep 26;8:755. doi: 10.3389/fnhum.2014.00755. eCollection 2014.
Mental exertion is known to impair endurance performance, but its effects on neuromuscular function remain unclear. The purpose of this study was to test the hypothesis that mental exertion reduces torque and muscle activation during intermittent maximal voluntary contractions of the knee extensors. Ten subjects performed in a randomized order three separate mental exertion conditions lasting 27 min each: (i) high mental exertion (incongruent Stroop task), (ii) moderate mental exertion (congruent Stroop task), (iii) low mental exertion (watching a movie). In each condition, mental exertion was combined with 10 intermittent maximal voluntary contractions of the knee extensor muscles (one maximal voluntary contraction every 3 min). Neuromuscular function was assessed using electrical nerve stimulation. Maximal voluntary torque, maximal muscle activation and other neuromuscular parameters were similar across mental exertion conditions and did not change over time. These findings suggest that mental exertion does not affect neuromuscular function during intermittent maximal voluntary contractions of the knee extensors.
已知精神 exertion 会损害耐力表现，但其对神经肌肉功能的影响仍不清楚。本研究的目的是检验以下假设：在膝关节伸肌间歇性最大自主收缩期间，精神 exertion 会降低扭矩和肌肉激活。10名受试者以随机顺序进行三种单独的精神 exertion 条件，每种条件持续27分钟：（i）高精神 exertion（不一致的斯特鲁普任务），（ii）中等精神 exertion（一致的斯特鲁普任务），（iii）低精神 exertion（看电影）。在每种条件下，精神 exertion 与膝关节伸肌的10次间歇性最大自主收缩相结合（每3分钟进行一次最大自主收缩）。使用电神经刺激评估神经肌肉功能。在不同的精神 exertion 条件下，最大自主扭矩、最大肌肉激活和其他神经肌肉参数相似，且不随时间变化。这些发现表明，在膝关节伸肌间歇性最大自主收缩期间，精神 exertion 不会影响神经肌肉功能。
