Use of a Kin-Com dynamometer to study the stretch-shortening cycle during plantar flexion
Use of a Kin-Com dynamometer to study the stretch-shortening cycle during plantar flexion
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使用 Kin-Com 测力计研究跖屈期间的拉伸-缩短周期
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
G. Grimby
中科院分区：
文献类型：
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作者：
U. Svantesson;Brian Ernstoff;Peter Bergh;G. Grimby
本研究的目的是评估Kin-Com II测力计在拉伸-缩短周期（离心肌肉动作之前的同心肌肉动作）研究中的作用。在两个不同的角度（0°和90°）下，以不同的角速度（120° · s-1和240° · s-1）测量跖屈。10名健康女性，年龄从22岁到41岁。扭矩值与表面肌电图（EMG）同时记录;最大自愿同心扭矩值被记录，并在短暂休息后，紧接着同样速度的离心动作后的同心动作的扭矩值，两者都具有最大的努力。在不同踝关节位置取平均值，并在不同范围内取平均值。在偏心动作之前的同心动作产生的扭矩值平均比单独的同心动作大约100%。肌电图活动降低或无变化。得出的结论是，本方法可以是有用的伸展缩短周期在跖屈的研究和测试的行为的弹性组件在残疾人的下肢。
SummaryThe aim of this study was to evaluate the Kin-Com II dynamometer in the study of the stretch-shortening cycle (a concentric muscle action preceded by an eccentric muscle action). Measurements were made of plantar flexion at different angular velocities (120° · s−1 and 240° · s−1) with the knee at two different angles (0° and 90°). Ten healthy women ranging in age from 22 to 41 years were studied. Torque values were recorded simultaneously with surface electromyograms (EMG); maximal voluntary concentric torque values were recorded and, after a short rest, the torque values of the concentric action which followed immediately after an eccentric action of the same velocity, both with maximal effort. Mean values were taken at different ankle positions and also averaged over different ranges. A concentric action preceded by an eccentric action generated a torque value on an average about 100% larger than a concentric action alone. The EMG activity was lower or unchanged. It was concluded that the present method could be useful in the study of the stretch-shortening cycle in plantar flexion and in the testing of the behaviour of the elastic components in people with disabilities in the lower limbs.