Reliability and efficacy of the long‐latency stretch reflex in the human thumb.
Reliability and efficacy of the long‐latency stretch reflex in the human thumb.
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人类拇指长潜伏期牵张反射的可靠性和有效性。
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
M. Traub
中科院分区：
文献类型：
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作者：
C. Marsden;P. Merton;H. Morton;J. Rothwell;M. Traub
1. 已经在 10 名正常人类受试者中研究了拇长屈肌长潜伏反射提供的位置补偿量。 2.通过突然增加施加到受试者用拇指指腹按压的杠杆上的站立力，使拇指的指间关节以高达900度/秒的速度伸展2至40度。 3. 对于这种幅度的拉伸，脊髓潜伏期的肌电图 (e.m.g.) 反应非常小或不存在。对于 5-25 度范围内的干扰，长潜伏期牵张反射产生约 50% 的平均位置校正。对于大于 25 度的扰动，响应开始饱和。 4. 电磁波即使在干扰不断增加的情况下，反应也是脉动的，仅持续约 50 毫秒；尽管仍然存在位置错误，但它经常会终止。 5. 牵张反射提供的位置校正的平均量在受试者之间存在很大差异。对个别受试者对同一拉伸的单一反应的检查显示，每次试验之间存在更大的差异。 6. 不同试验中长潜伏期牵张反射产生的补偿变化不能用各个牵张的大小或最大速度的微小变化来解释。
1. The amount of positional compensation afforded by the long‐latency reflex in the flexor pollicis longus has been investigated in ten normal human subjects. 2. The interphalangeal joint of the thumb was extended by between 2 and 40 degrees at up to 900 deg/s by suddenly increasing the standing force applied to the lever against which the subject was pressing with the pad of the thumb. 3. Electromyographic (e.m.g.) responses at spinal‐latency were very small or absent for stretches of this magnitude. The long‐latency stretch reflex produced an average positional correction of about 50% for disturbances in the range of 5‐25 degrees. The response began to saturate for disturbances of greater than 25 degrees. 4. The e.m.g. response was pulsatile, lasting only some 50 ms, even during continuously increasing disturbances; frequently it terminated despite a remaining positional error. 5. There was a large variation from subject to subject in the average amount of positional correction provided by the stretch reflex. Examination of single responses to the same stretch in individual subjects showed an even greater variation from trial to trial. 6. Variation in the compensation produced by the long‐latency stretch reflex from trial to trial could not be explained by the slight variation in size or maximum velocity of the individual stretches.