Different activations of the soleus and gastrocnemii muscles in response to various types of stance perturbation in man
Different activations of the soleus and gastrocnemii muscles in response to various types of stance perturbation in man
复制标题
比目鱼肌和腓肠肌对人体不同类型姿态扰动的不同激活
DOI：
10.1007/bf00228159
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发表时间：
2004
影响因子：
2
通讯作者：
M. Schieppati
中科院分区：
文献类型：
--
作者：
A. Nardone;T. Corrà;M. Schieppati
比目鱼肌（Sol）和内侧和外侧腓肠肌（GM和GL）在各种运动期间表现不同，但没有尝试公开这些肌肉在直立姿势扰动期间的任何明显激活。因此，激活的三个小腿三头肌（TS）肌肉和胫骨前肌（TA）的模式进行了研究，在正常受试者旋转和线性位移的可移动平台。在保持框架的同时，还研究了“姿势设置”对反应的影响。在独立的主题，TS拉伸（向上倾斜，UT和向后平移，BT）引起了一个大的短潜伏期反应（SLR）在溶胶;较小的SLR有时会引起GM或GL。中潜伏期反应（MLR）始终存在于两个或只有一个腓肠肌。平均而言，反应的幅度和出现频率的分布如下：SLR，Sol>GL>GM; MLR，GM>GL>Sol。扰动的类型并不影响所有TS肌肉反应的潜伏期，但在BT期间MLR的持续时间，幅度和频率大于UT。MLR之后是TA中的拮抗反应（AR），UT期间比BT期间更大且更频繁。TA拉伸（向下倾斜，DT和向前平移，FT）诱导TA MLR，FT的持续时间和面积大于DT。AR发生在TS的一个或多个肌肉中，在Sol中更大，更频繁。在稳定站立条件下，SLR不受影响，但所有MLR和AR的幅度都大大降低。TS和TA MLR之间的相似性（稳定条件下的发生频率、潜伏期和抑制）表明了共同的潜在机制和相似的姿势作用。另一方面，所有的TS反应是不均匀地分布在个别肌肉和在不同的主题。这建议在得出结论时要谨慎，因为它们不存在或对患者的姿势设置敏感，当只记录TS的一个肌肉时。
SummaryThe soleus (Sol) and medial and lateral gastrocnemii (GM and GL) behave differently during various movements, but no attempt has been made to disclose any distinct activation of these muscles during perturbations of upright stance. Therefore the pattern of activation of the three triceps surae (TS) muscles and of the tibialis anterior (TA) was studied in normal subjects following rotational and linear displacements of a movable platform. The effect of “postural set” on the responses was also studied while holding onto a frame. In free-standing subjects, TS stretches (upward tilt, UT and backward translation, BT) evoked a large short latency response (SLR) in Sol; smaller SLRs were sometimes induced in GM or GL. A medium latency response (MLR) was consistently present in both or only one gastrocnemii. On the average, the amplitude and the frequency of occurrence of the responses were distributed as follows: SLR, Sol>GL>GM; MLR, GM>GL>Sol. The type of perturbation did not affect the latency of all TS muscle responses, but the duration, amplitude and frequency of MLRs were larger during BT than UT. MLRs were followed by an antagonistic reaction (AR) in the TA, larger and more frequent during UT than BT. TA stretches (downward tilt, DT and forward translation, FT) induced a TA MLR, with duration and area larger in FT than DT. ARs occurred in one or more muscles of TS, being larger and more frequent in Sol. Under the conditions of stabilized stance, SLRs were not affected, but all the MLRs and ARs were much reduced in amplitude. The analogies between TS and TA MLRs (frequency of occurrence, latency and suppression under stabilized condition) suggest a common underlying mechanism and a similar postural role. On the other hand, all the TS responses are unequally distributed in the individual muscles and in the various subjects. This recommends caution in drawing conclusions in their absence or from their susceptibility to postural set in patients, when only one muscle of TS is being recorded.