Modulation of short latency stretch reflexes during human hopping.
Modulation of short latency stretch reflexes during human hopping.
复制标题
人类跳跃过程中短潜伏期牵张反射的调节。
DOI：
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
E. Simonsen
中科院分区：
文献类型：
--
作者：
Michael Voigt;P. Dyhre‐Poulsen;E. Simonsen
为了深入了解运动人类的中枢和外周反射控制机制，我们研究了两腿跳跃时三头肌表面的短潜伏期拉伸反射活动。目的是：(1)比较运动诱导的比目鱼肌和腓肠肌内侧肌（MG）的短潜伏期拉伸反射；(2)确定这些反射的大小与肌肉纺锤体拉伸速度之间的关系；(3)同时比较运动诱导的短潜伏期拉伸反射和h -反射的大小。六名训练有素的健康男性受试者参与其中，他们以三种不同的工作速度跳跃。记录跳跃过程中肌表电图（EMG）和h反射。肌纺锤体长度的变化估计为估计的起点到止点长度变化和肌腱长度变化之间的差异。结果表明：在跳跃过程中，运动诱导的短潜伏期拉伸反射在比目鱼肌中持续存在；该拉伸反射的肌电图振幅与估计的肌纺锤体拉伸速度峰值呈负相关（rs = -0.52, P < 0.02）；着地时比目鱼肌h反射的振幅不随拉伸反射平行变化。拉伸反射与比目鱼肌纺锤体拉伸速度峰值之间的负相关与静息条件下机械引起的拉伸反射的基本速度敏感行为相反。讨论了可能的控制机制。此外，由于肌腱的顺应性，特别是在高肌腱力的情况下，应谨慎推断由骨骼运动（关节角度）变化估计的肌肉纺锤体长度变化。
To gain insight into central and peripheral reflex control mechanisms in moving humans we have investigated short latency stretch reflex activity in m. triceps surae during two legged hopping. The objectives were: (1) to compare movement induced short latency stretch reflexes in soleus and medial gastrocnemius (MG) muscles, (2) to determine the relationship between the size of these reflexes and the muscle spindle stretch velocities, and (3) to compare the size of the movement induced short latency stretch reflexes and the H-reflexes simultaneously. Six well-trained healthy male subjects participated and they hopped at three different work rates. Surface electromyogram (EMG) and H-reflexes were recorded during hopping. Muscle spindle length changes were estimated as the difference between estimated origin-to-insertion length changes and tendon length changes. The important findings were that during hopping: (1) movement induced short latency stretch reflexes were observed consistently in soleus, (2) the EMG amplitude of this stretch reflex was negatively correlated with the estimated peak muscle spindle stretch velocity (rs = -0.52, P < 0.02), and (3) the amplitude of the soleus H-reflex at touchdown did not change in parallel with the stretch reflex. The negative correlation observed between the stretch reflex and the estimated peak muscle spindle stretch velocity in soleus is opposite to the basic velocity sensitive behaviour of stretch reflexes mechanically elicited during resting conditions. Possible control mechanisms are discussed. Additionally, muscle spindle length changes estimated from changes in the skeletal movements (joint angles) should be inferred cautiously because of tendon compliance, especially at high tendon forces.
连续斜坡拉伸引起的猫比目鱼肌的机械特性：对肌肉控制的影响。
影响因子：
2.5
作者：
Lin,DC;Rymer,WZ
通讯作者：
Rymer,WZ