性别对动态膝关节收缩过程中肌肉疲劳的影响。
Influence of gender on muscle fatigue during dynamic knee contractions.
作者信息
Fujisawa Chiharu, Tamaki Akira, Yamada Eiji, Matsuoka Hirofumi
机构信息
Shinko Hospital Rehabilitation Center.
Graduate School of Health Science, Hyogo University of Health Sciences.
出版信息
Phys Ther Res. 2017 Feb 24;20(1):1-8. doi: 10.1298/ptr.E9889. eCollection 2017.
PURPOSE
The purpose was to compare quadriceps muscle fatigue and change in surface electromyogram (sEMG) spectral power, muscle thickness, and peak torque (normalized by body weight) in men and women during isokinetic knee contractions.
METHODS
Nineteen healthy volunteers (10 men, 9 women) participated. The volunteers performed 32 consecutive maximal isokinetic knee contractions for peak torque and muscle fatigue index (FI). The sEMG data were analyzed using wavelet analysis for median frequency (MF). Muscle thickness was measured using ultrasonography.
RESULTS
Men had a significantly higher FI, peak torque (Nm/kg), muscle thickness than women (p<0.05). A significant linear decreased MF slope in the vastus lateralis was observed (p<0.05) in men than in women. There was no significant difference in MF slope in the vastus medialis between men and women.
CONCLUSION
During muscle fatigue assessment, men had a significantly greater muscle thickness, knee extension peak torque, and a higher decrease of MF slope than women. Our results indicate that specific muscle fatigue observed during repeated muscle knee contractions is significantly influence by gender and affects MF slope, knee extension peak torque, and muscle thickness.
目的
比较男性和女性在等速膝关节收缩过程中股四头肌疲劳情况以及表面肌电图（sEMG）频谱功率、肌肉厚度和峰值扭矩（按体重归一化）的变化。
方法
19名健康志愿者（10名男性，9名女性）参与研究。志愿者连续进行32次最大等速膝关节收缩以测量峰值扭矩和肌肉疲劳指数（FI）。使用小波分析对sEMG数据进行中频（MF）分析。通过超声测量肌肉厚度。
结果
男性的FI、峰值扭矩（Nm/kg）和肌肉厚度显著高于女性（p<0.05）。男性股外侧肌的MF斜率显著线性下降（p<0.05），且下降幅度大于女性。男性和女性股内侧肌的MF斜率无显著差异。
结论
在肌肉疲劳评估过程中，男性的肌肉厚度、膝关节伸展峰值扭矩显著更大，MF斜率下降幅度也高于女性。我们的结果表明，在重复肌肉膝关节收缩过程中观察到的特定肌肉疲劳受性别显著影响，并影响MF斜率、膝关节伸展峰值扭矩和肌肉厚度。
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