The influence of agonist premotor silence and the stretch-shortening cycle on contractile rate in active skeletal muscle
The influence of agonist premotor silence and the stretch-shortening cycle on contractile rate in active skeletal muscle
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激动剂运动前沉默和拉伸-缩短周期对主动骨骼肌收缩率的影响
DOI：
10.1007/bf00418465
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
C. Walter
中科院分区：
文献类型：
--
作者：
C. Walter
在进行最大收缩的受试者中研究了激动剂运动前沉默（PMS），即阶段性激活前活动骨骼肌中的短暂相对静止期。检查肘关节屈曲和伸展的静默期的发生频率和潜在功能。PMS在两个方向上的运动都很明显，表明该机制并不像以前假设的那样主要限于伸肌。经前综合征的患者表现出速度和加速度的增加;然而，运动促进作用仅在肌肉拉伸缩短周期（SSC）试验中表现明显。SSC存在于缺乏PMS的试验中，表明二头肌和三头肌沉默不是肘关节屈曲和伸展的预备激动剂延长的唯一决定因素。综上所述，数据表明，激动剂PMS是一种明显的中枢控制下的机制，伴随着机械因素，以加强肘屈肌收缩。
Agonist premotor silence (PMS), a brief period of relative quiescence in active skeletal muscle prior to phasic activation, was investigated in subjects performing maximal contractions. The frequency of occurrence and potential function of the silent period were examined for elbow flexions and extensions. PMS was evident for movements in both directions, indicating that the mechanism is not primarily limited to extensors as previously hypothesized. Flexions demonstrating PMS exhibited increased velocity and acceleration; however, kinematic facilitation was only evident on trials exhibiting the muscular stretch-shortening cycle (SSC). The SSC was present on trials lacking PMS, demonstrating that biceps and triceps silence are not the sole determinants of preparatory agonist lengthening for elbow flexions and extensions, respectively. Taken together, the data indicate that agonist PMS is a mechanism under apparent central control that acts concomitantly with mechanical factors to potentiate elbow flexor contractions.