男性和女性的手臂和腿部肌肉在动态收缩后的疲劳和恢复情况有所不同。
Fatigue and recovery from dynamic contractions in men and women differ for arm and leg muscles.
机构信息
Department of Physical Therapy, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin, 53201, USA.
出版信息
Muscle Nerve. 2013 Sep;48(3):436-9. doi: 10.1002/mus.23836. Epub 2013 Jul 27.
INTRODUCTION
Whether there is a gender difference in fatigue and recovery from maximal velocity fatiguing contractions and across muscles is not understood.
METHODS
Sixteen men and 19 women performed 90 isotonic contractions at maximal voluntary shortening velocity (maximal velocity concentric contractions, MVCC) with the elbow flexor and knee extensor muscles (separate days) at a load equivalent to 20% maximal voluntary isometric contraction (MVIC).
RESULTS
Power (from MVCCs) decreased similarly for men and women for both muscles (P > 0.05). Men and women had similar declines in MVIC of elbow flexors, but men had greater reductions in knee extensor MVIC force and MVIC electromyogram activity than women (P < 0.05). The decline in MVIC and power was greater, and force recovery was slower for the elbow flexors compared with knee extensors.
CONCLUSIONS
The gender difference in muscle fatigue often observed during isometric tasks was diminished during fast dynamic contractions for upper and lower limb muscles.
简介
在最大速度疲劳收缩和跨肌肉的疲劳和恢复方面是否存在性别差异尚不清楚。
方法
16 名男性和 19 名女性以 20%最大自主等长收缩（MVIC）的负荷分别进行了 90 次最大自主缩短速度（最大速度向心收缩，MVCC）的肘屈肌和膝伸肌等速收缩（分别在不同的日子）。
结果
对于两种肌肉，男性和女性的功率（来自 MVCC）下降相似（P > 0.05）。男性和女性的肘屈肌的 MVIC 均有相似的下降，但男性的膝伸肌的 MVIC 力和 MVIC 肌电图活动的下降幅度大于女性（P < 0.05）。与膝伸肌相比，MVIC 和功率的下降更大，且肘屈肌的力恢复更慢。
结论
在等长任务中经常观察到的肌肉疲劳的性别差异在上下肢肌肉的快速动态收缩中减弱。
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