衰老不会改变脚,肌肉和肌的硬度,在与姿势相关的低负载下
Kristen L Jakubowski1,2,3,4, Daniel Ludvig5,6, Sabrina S M Lee7,8
1Department of Biomedical Engineering, Northwestern University, Evanston, IL, USA. kjakubowski@u.northwestern.edu.
Annals of biomedical engineering
|May 30, 2024
概括
老年人表现出减少的脚,肌肉和肌硬度在匹配的努力由于与年龄相关的力量下降,而不是固有的机械性质变化. 负载匹配测试显示,硬度没有年龄差异.
科学领域:
- 生物力学 生物力学
- 老年学是指老年学的学科.
- 肌肉骨生理学 肌肉骨生理学
背景情况:
- 年长的成年人经历着姿势不稳定,部分原因是三肌和阿基里斯肌的硬.
- 关于与年龄相关的肌硬度变化的先前研究经常使用匹配的努力,而不是匹配的负载,忽视力量差异.
- 有限的研究存在于年龄相关的肌肉度变化.
研究的目的:
- 为了研究衰老如何影响肌肉和肌的性.
- 为了确定与年龄相关的肌肉和肌硬度对脚硬度的影响.
- 在匹配负载和匹配力条件下评估这些效应.
主要方法:
- 使用B模式超声波和关节水平扰动来测量脚,肌肉和肌的硬度.
- 测试了十七名健康的年轻人和老年人,在各种负载和努力中进行了测试.
- 在匹配的负载 (例如,站立) 和匹配的力度水平 (例如,30%的最大力度) 上进行比较的刚度测量.
主要成果:
- 在匹配的负载下,年龄组之间没有发现足,肌肉或肌硬度的显著差异.
- 在30%的最大努力下,老年人显著减少了脚 (27%),肌肉 (37%) 和肌 (22%) 的性.
- 与年轻人相比,老年人在脚flexion中有36%的弱点.
结论:
- 与年龄相关的脚,肌肉和肌硬度的降低,主要是由于肌肉力量的减少,而不是内在的机械性质变化.
- 当负荷相匹配时,肌肉和肌的机械特性不会随着年龄显著不同.
- 老年人的力量缺陷解释了在匹配的努力水平上观察到的硬度差异.
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