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首页> 外文期刊>Journal of electromyography and kinesiology: Official journal of the International Society of Electrophysiological Kinesiology >Aging effects on posture-related modulation of stretch reflex excitability in the ankle muscles in humans
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Aging effects on posture-related modulation of stretch reflex excitability in the ankle muscles in humans

机译：衰老对人类脚踝肌肉中与姿势相关的拉伸反射兴奋性调制的影响

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摘要

The purpose of this study was to examine the effects of aging on posture-related changes of the stretch reflex excitability in the ankle extensor, soleus (SOL), and flexor, tibialis anterior (TA) muscles. Fourteen neurologically normal elderly (mean 68 ± 6 years) and 12 young (mean 27 ± 3. years) subjects participated. Under two postural conditions, upright standing (STD) and sitting (SIT), stretch reflex electromyographic (EMG) responses in the SOL/TA muscle were elicited by imposing rapid ankle dorsi-/plantar-flexion. Under the SIT condition, subjects were asked to keep the SOL background EMG level, which is identical to that under the STD condition. In the SOL muscle, both groups showed significant enhancement of the short-latency stretch reflex (SLR) response when the posture changed from SIT to STD. In the TA muscle, the young group showed significant enhancement of the middle- (MLR) and long-latency stretch reflex (LLR) when the posture changed from SIT to STD; no such modulation was observed in the elderly group. Since the TA stretch reflex responses under the STD condition were comparable in the young and elderly groups, the lack of posture-related modulation of the TA muscle in the elderly group might be explained by augmented stretch reflex excitability under the SIT condition. The present results suggest that the (1) SOL SLR responses are modulated both in the young and elderly subjects when the posture is changed from SIT to STD, (2) TA MLR and LLR responses are not modulated in the elderly subjects when the posture is changed from SIT to STD, while each response is same between the young and elderly in STD, and (3) the effect of aging on the posture-related stretch reflex differs in the SOL and TA muscles.
机译：这项研究的目的是检查衰老对脚踝伸肌，比目鱼肌（SOL）和屈肌，胫前肌（TA）肌肉中与姿势相关的拉伸反射兴奋性变化的影响。参加研究的十四名神经系统正常的老年人（平均68±6岁）和12位年轻人（平均27±3岁）。在两个姿势条件下，通过强行脚踝背屈/足底屈曲引起SOL / TA肌肉中的直立站立（STD）和坐姿（SIT），拉伸反射肌电图（EMG）反应。在SIT条件下，要求受试者保持SOL背景EMG水平，这与STD条件下的水平相同。在SOL肌肉中，当姿势从SIT变为STD时，两组均显示出短时延拉伸反射（SLR）反应的显着增强。在TA肌肉中，当姿势从SIT变为STD时，年轻组的中层（MLR）和长潜伏期拉伸反射（LLR）显着增强。在老年组中未观察到这种调节。由于STD条件下的TA伸展反射反应在年轻人和老年人组中相当，因此老年人组TA肌肉缺乏与姿势相关的调节可能是由于SIT条件下伸展反射兴奋性增强所致。目前的结果表明：（1）当姿势从SIT变为STD时，无论是年轻人还是老年人，都对SOL SLR反应进行了调节;（2）当姿势从SIT变为STD时，老年人中没有对TA MLR和LLR反应进行调节。从SIT变为STD，而STD的年轻人和老年人之间的每个反应都相同，并且（3）衰老对与姿势相关的拉伸反射的影响在SOL和TA肌肉中有所不同。

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