Long-latency spinal reflexes in humans.
Long-latency spinal reflexes in humans.
复制标题
人类的长潜伏期脊髓反射。
DOI：
10.1152/jn.1985.53.6.1604
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发表时间：
1985
影响因子：
2.5
通讯作者：
U. Shahani
中科院分区：
文献类型：
--
作者：
K. Darton;O. Lippold;M. Shahani;U. Shahani
用机械装置拉伸人体肌肉，在校正和平均的肌电图中产生多个峰。在第一背侧骨间肌中，第一峰（M1）的潜伏期为32.4 +/- 2.4 ms（SD），第二峰（M2）的潜伏期为55.1 +/- 11.3 ms，在两种情况下，从刺激时间到峰的起飞点测量。通常可以看到第三个峰（M3），具有相当长的潜伏期。峰M1的起源被认为是在牵张反射弧，因为它的潜伏期和它的恒定的肌肉运动的关联。峰M2是由于产生肌肉拉伸的机械装置刺激皮肤和/或皮下组织中的传入末梢。参与M1分量产生的通路的传导速度与M2的传导速度相同。这意味着脊髓中的中央处理延迟了M2反应。M2机制不涉及经皮质（长环）通路，因为在足部肌肉中，M1-M2延迟与手部肌肉相同，尽管M1潜伏期延长（趾长伸肌为39.4 +/- 6.2 ms）。这表明M2冲动没有时间穿过比进出脊髓更长的通路。
Stretching human muscles with a mechanical device gave rise to multiple peaks in the rectified and averaged electromyogram. In the first dorsal interosseous the latency of the first peak (M1) was 32.4 +/- 2.4 ms (SD) and the latency of the second peak (M2) was 55.1 +/- 11.3 ms, in both cases measured from the time of the stimulus to the take-off point of the peak. Often a third peak (M3) was seen, having a considerably longer latency. The origin of peak M1 was considered to be in the stretch reflex arc because of its latency and its invariable association with muscle movement. Peak M2 was due to stimulation of afferent terminals in the skin and/or subcutaneous tissues by the mechanical device producing the muscle stretch. The conduction velocity of the pathway involved in the generation of the M1 component is the same as that for M2. This implies that central processing in the spinal cord delays the M2 response. The M2 mechanism does not involve a transcortical (long-loop) pathway because in foot muscles the M1-M2 delay remains the same as is found for hand muscles, although M1 latency is prolonged (to 39.4 +/- 6.2 ms for extensor digitorum longus). This indicates that there is not time for M2 impulses to traverse a pathway any longer than that passing to and from the spinal cord.