Measurement of active muscle stiffness with and without the stretch reflex
Measurement of active muscle stiffness with and without the stretch reflex
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DOI：
10.1016/j.jbiomech.2018.03.027
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发表时间：
2018-05-17
影响因子：
2.4
通讯作者：
Ikebukuro, Toshihiro
中科院分区：
文献类型：
--
作者：
Kubo, Keitaro;Ishigaki, Tomonobu;Ikebukuro, Toshihiro
本研究的目的是根据较慢角速度（峰值角速度 100 deg.s(-1)）期间扭矩和肌束长度的变化（拉伸后 110 毫秒内）评估具有牵张反射的主动肌肉硬度，与较慢和较快角速度（峰值角速度 250 deg.s(-1)）期间无牵张反射（拉伸后 60 毫秒内）的主动肌肉硬度进行比较。根据在次最大等长收缩（10-90%最大随意收缩）期间较慢和较快拉伸时估计的肌力和肌束长度的变化，计算腓肠肌内侧的主动肌肉刚度。随着施加的扭矩水平变得更高，角速度和分析周期的主动肌肉刚度显着增加。角速度的影响以及角速度与扭矩水平之间的相互作用在 250 deg.s(-1)（拉伸后 60 毫秒期间）和 100 deg.s(-1)（拉伸后 110 毫秒期间）条件下没有显着差异。对于 100 deg.s(-1) 条件，分析周期的影响以及分析周期与扭矩水平之间的相互作用在分析周期（拉伸后 60 毫秒和 110 毫秒周期）之间没有显着差异。此外，在相同角速度下测量的主动肌肉刚度在不同分析时段计算的主动肌肉刚度之间具有显着相关性，而250 deg.s(-1)（拉伸后60毫秒期间）下的那些与100 deg.s(-1)（拉伸后110毫秒期间）以下的那些没有相关性。这些结果表明主动肌肉僵硬不受牵张反射的影响。 (C) 2018 Elsevier Ltd. 保留所有权利。
The purpose of the present study was to evaluate active muscle stiffness with the stretch reflex according to changes (in 110-ms period after stretching) in torque and fascicle length during slower angular velocity (peak angular velocity of 100 deg.s(-1)) in comparison with active muscle stiffness without the stretch reflex (in 60-ms period after stretching) during slower and faster (peak angular velocity of 250 deg.s(-1)) angular velocities. Active muscle stiffness in the medial gastrocnemius muscle was calculated according to changes in estimated muscle force and fascicle length with slower and faster stretching during submaximal isometric contractions (10-90% maximal voluntary contractions). Active muscle stiffness significantly increased for both angular velocities and analyzed periods as torque levels exerted became higher. The effects of angular velocities and the interaction between angular velocities and torque levels were not significantly different between 250 deg.s(-1) (in 60-ms period after stretching) and 100 deg.s(-1) (in 110-ms period after stretching) conditions. The effects of the analyzed periods and the interaction between analyzed periods and torque levels were not significantly different between the analyzed periods (60-ms and 110-ms periods after stretching) for the 100 deg.s(-1) condition. Furthermore, active muscle stiffness measured during the same angular velocity had significant correlations between those calculated in the different analyzed periods, whereas those under 250 deg.s(-1) (60-ms period after stretching) did not correlate with those under 100 deg.s(-1) (110-ms period after stretching). These results suggest that active muscle stiffness is not influenced by the stretch reflex. (C) 2018 Elsevier Ltd. All rights reserved.