Relation between intrinsic viscoelasticity and activation level of the human finger muscle during voluntary isometric contraction.
Relation between intrinsic viscoelasticity and activation level of the human finger muscle during voluntary isometric contraction.
复制标题
自主等长收缩期间人体手指肌肉的内在粘弹性和激活水平之间的关系。
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
H. Kusumoto
中科院分区：
文献类型：
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作者：
K. Akazawa;R. Okuno;H. Kusumoto
本研究的目的是分离的长度扰动诱发力归因于内在肌肉粘弹性，并探讨肌肉粘弹性和肌肉激活水平之间的关系，在等长收缩在5名健康男性受试者。一个小的长度扰动（拉伸或收缩）施加到拇长屈肌肌肉，而受试者保持恒定的等距力;长度扰动的时间过程被发现在所有的实验中几乎是相同的。在扰动开始后35 ms的间隔内使用等式Fv = F-Fc- Fp计算由肌肉粘弹性诱导的力（Fv），其中F是测量的力，Fc是扰动开始前的强直等轴力，Fp是从相同长度扰动获得的静止力。在此期间，不包括归因于牵张反射的力反应。这些实验在不同水平的等长力下重复进行。在肌肉的拉伸和收缩过程中，肌肉粘弹性诱导力与强直性等长收缩力之间几乎呈线性关系，即肌肉的固有粘弹性与等长收缩水平几乎呈线性关系。
The purpose of the present study was to isolate the length perturbation-evoked force attributed to intrinsic muscle viscoelasticity, and to investigate the relation between muscle viscoelasticity and the level of muscle activation during isometric contraction in five healthy male subjects. A small length perturbation (stretching or contraction) was applied to the flexor pollicis longus muscle while the subject maintained constant isometric force; the time courses of the length perturbation was found to be almost identical in all the experiments. The force (Fv) induced by the muscle viscoelasticity was calculated using the equation Fv = F - Fc - Fp over an interval of 35 ms after the onset of perturbation, where F is the measured force, Fc is the tonic isometric force before the onset of perturbation and Fp is the force at rest obtained from the same length perturbation. The force response attributed to the stretch reflex is not included during this interval. These experiments were repeated at varying levels of isometric force. An almost linear relationship was obtained between the muscle viscoelasticity-induced force and the tonic isometric force during both the stretching and contraction of the muscle, i.e. the intrinsic muscle viscoelasticity varied almost linearly with the level of isometric contraction.