Steadiness in plantar flexor muscles and its relation to postural sway in young and elderly adults.
Steadiness in plantar flexor muscles and its relation to postural sway in young and elderly adults.
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DOI：
10.1002/mus.21599
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发表时间：
2010-07
期刊：
影响因子：
3.4
通讯作者：
Shinohara M
中科院分区：
文献类型：
--
作者：
Kouzaki M;Shinohara M
为了研究选定肌肉群随意收缩期间力波动的功能意义，我们对 20 名年轻人和 20 名老年人进行了足底屈肌自愿收缩期间力波动与安静站立时姿势摇摆之间的关联。年轻和年长的受试者在测力平台上保持安静的站立姿势。他们还通过单侧等距跖屈执行了力匹配任务。在年轻人和老年人中，仅当收缩强度≤ 5%最大随意收缩（对应于安静站立时的肌肉活动）时，安静站立时压力中心的变异系数（CV）与跖屈时力的CV之间存在正相关。安静站立时和跖屈时低收缩强度时，老年人腓肠肌内侧肌电图功率大于年轻人，约为 10 Hz。对于年轻人和老年人来说，低强度跖屈期间运动输出的波动与安静站立时的姿势摇摆有关。
To investigate the functional significance of force fluctuations during voluntary contraction with a select muscle group, we examined the association between force fluctuations during voluntary contraction with plantar flexor muscles and postural sway during quiet standing in 20 young and 20 elderly adults. Young and elderly subjects maintained a quiet standing position on a force platform. They also performed a force-matching task with unilateral isometric plantar flexion. A positive correlation was found in young and elderly adults between the coefficient of variation (CV) of center of pressure during quiet standing and the CV of force during plantar flexion only at contraction intensities ≤ 5% maximum voluntary contraction that corresponded to muscle activity during quiet standing. The electromyogram power in the medial gastrocnemius was greater in elderly than young adults around 10 Hz during quiet standing and at low contraction intensities during plantar flexion. Fluctuations in motor output during low-intensity plantar flexion were associated with postural sway during quiet standing in both young and elderly adults.