Postural modulation of the soleus H reflex in young and old subjects
Postural modulation of the soleus H reflex in young and old subjects
复制标题
DOI：
10.1016/0924-980x(95)00163-f
复制
发表时间：
1995-12-01
期刊：
影响因子：
--
通讯作者：
Trimble, MH
中科院分区：
文献类型：
--
作者：
Koceja, DM;Markus, CA;Trimble, MH
在15名老年人（平均年龄= 76.3岁）和10名年轻人（平均年龄= 24.2岁）中评估了不同静态姿势对比目鱼肌H反射的影响。在2种随机给药条件下获得H反射和M波募集曲线：（1）站立;（2）俯卧。一旦就位，记录和刺激电极在测试完成之前不得移除，以确保保持准确放置。经皮给予1毫秒的电流脉冲以引起H反射和M反应。静态姿势摇摆面积（cm（2））使用定制软件（采样率= 50 Hz/15 sec试验）在Kistler测力平台上进行评估。结果表明，年轻受试者的H反射的幅度从俯卧（H-max/M（max）= 73.6%）到站立（H-max/M（max）= 59.9%），而老年受试者没有（俯卧= 32.4%，站立= 38.2%）。然而，在老年组中，出现了2个亚组-与年轻受试者相似的反射抑制者（O-D，n = 6）和不抑制反射的受试者（O-ND，n = 9）。此外，有显着差异的姿势摇摆得分之间的年轻和老年人，O-D和O-ND，但O-D和年轻组之间没有。这些结果表明，在其中年轻人和老年人受试者调节比目鱼肌H反射站立时的方式的差异，并支持的观点，即调制的拉伸反射可能是重要的静态姿势的控制。
The influence of different static postures on the soleus H reflex was assessed in 15 old (mean age = 76.3 years) and 10 young (mean age = 24.2 years) subjects. H reflex and M wave recruitment curves were obtained under 2 randomly administered conditions: (1) standing; and (2) prone. Once in place, the recording and stimulating electrodes were not removed until the completion of testing, to ensure that exact placement was maintained. A 1 msec current pulse was given transcutaneously to elicit the H reflex and M response. Static postural sway area (cm(2)) was assessed on a Kistler force platform using custom software (sample rate = 50 Hz/15 sec trials). Results demonstrated that the young subjects reduced the amplitude of the H reflex from the prone (H-max/M(max) = 73.6%) to the standing (H-max/M(max) = 59.9%) condition, whereas the old subjects did not (prone = 32.4%, standing = 38.2%). However, within the old group, 2 subgroups emerged - those who depressed the reflex similar to the young subjects (O-D, n = 6) and those who did not depress the reflex (O-ND, n = 9). Furthermore, there were significant differences in postural sway scores between the young and old, between the O-D and O-ND, but not between the O-D and young groups. These results suggest differences in the manner in which young and old subjects modulate the soleus H reflex when standing, and support the view that modulation of the stretch reflex may be important in the control of static posture.