老年人腰背伸肌的力量和疲劳。
Strength and fatigue of lumbar extensor muscles in older adults.
机构信息
Faculty of Health Sciences, Jalan Raja Muda Aziz, National University of Malaysia, Kuala Lumpur, Malaysia.
出版信息
Muscle Nerve. 2011 Jul;44(1):74-9. doi: 10.1002/mus.21998. Epub 2011 Apr 12.
INTRODUCTION
Loss of lumbar extensor muscle strength and fatigue resistance may contribute to functional disability.
METHODS
Two groups of subjects were recruited: young (n = 26, 20-35 years of age) and old (n = 26, ≥65 years of age) adults. Lumbar extensor muscle strength was measured with a load cell, and electromyographic activities were recorded to study muscle fatigue at 60% of maximum voluntary contraction.
RESULTS
We found that the muscle moments generated by the extensor muscles decreased with age (P < 0.05). Aging was associated with a significant increase in the power of the lower frequency band (101-200 Hz) of the electromyographic signals (P < 0.05), but the spectral characteristics did not appear to change with sustained contraction (P > 0.05).
CONCLUSIONS
The changes in strength and spectral properties of the electromyographic signals of lumbar extensor muscles may be related to age-related alterations in muscle fiber composition and recruitment. These changes should be considered in clinical functional task evaluation.
简介
腰椎伸肌力量和疲劳抵抗力的丧失可能导致功能障碍。
方法
招募了两组受试者：年轻组（n=26，20-35 岁）和老年组（n=26，≥65 岁）。使用负载细胞测量腰椎伸肌力量，并记录肌电图活动，以研究最大随意收缩的 60%时的肌肉疲劳。
结果
我们发现，伸肌产生的肌肉力矩随年龄增长而减小（P<0.05）。衰老与肌电图信号低频带（101-200 Hz）功率的显著增加相关（P<0.05），但频谱特征似乎不因持续收缩而改变（P>0.05）。
结论
腰椎伸肌力量和肌电图信号频谱特性的变化可能与肌肉纤维成分和募集的年龄相关改变有关。在临床功能任务评估中应考虑这些变化。
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