Long-latency enhancement of quadriceps excitability from stimulation of skin afferents in young and old adults.
Long-latency enhancement of quadriceps excitability from stimulation of skin afferents in young and old adults.
复制标题
年轻人和老年人皮肤传入刺激引起股四头肌兴奋性的长潜伏期增强。
DOI：
10.1093/geronj/44.5.m158
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Koceja,DM
中科院分区：
文献类型：
--
作者：
Burke,JR;Kamen,G;Koceja,DM
本研究考察了皮肤输入对年轻人和老年人脊髓兴奋性的作用。15名老年人（M = 75岁）和25名年轻人（M = 26岁）的髌腱反射在以下四个皮肤部位之一的皮肤刺激后的15至175毫秒的间隔内被激发：(a)同侧小腿，(b)对侧小腿（仅限老年人），(c)同侧大腿前，(d)对侧大腿前。从峰值力可以看出，年轻人的反射反应比老年人更强烈。年轻人的力潜伏期也比老年人快。然而，无论皮肤刺激部位如何，两个年龄组均表现出股四头肌兴奋性的长潜伏期促进。因此，低阈值皮肤传入神经似乎为随年龄增长而维持的伸肌运动神经元库提供了兴奋性输入。
This study examined the role of cutaneous input on spinal excitability in young and old adults. Patellar tendon reflexes were elicited in 15 old adults (M = 75 yrs) and 25 young adults (M = 26 yrs) at intervals ranging from 15 to 175 ms following cutaneous stimulation to one of four skin sites: (a) ipsilateral calf, (b) contralateral calf (old adults only), (c) ipsilateral anterior thigh, and (d) contralateral anterior thigh. The younger adults had a more vigorous reflex response than the older adults, as indicated by peak force. Force latencies were also faster for the younger adults than the older adults. However, both age groups showed a long-latency facilitation of quadriceps excitability regardless of cutaneous stimulation site. Thus, it seems that low threshold cutaneous afferents contribute an excitatory input to the extensor motoneuron pool that is maintained with age.