Svantesson U, Ernstoff B, Bergh P, Grimby G
Department of Rehabilitation Medicine, University of Göteborg, Sweden.
Eur J Appl Physiol Occup Physiol. 1991;62(6):415-9. doi: 10.1007/BF00626613.
The 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 degrees.s-1 and 240 degrees.s-1) with the knee at two different angles (0 degree and 90 degrees). 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.
本研究的目的是评估Kin-Com II测力计在拉长-缩短周期（一种先进行离心肌肉动作再进行向心肌肉动作）研究中的作用。在膝关节处于两个不同角度（0度和90度）时，以不同角速度（120度·秒⁻¹和240度·秒⁻¹）测量跖屈情况。对10名年龄在22至41岁之间的健康女性进行了研究。同时记录扭矩值和表面肌电图（EMG）：记录最大自主向心扭矩值，短暂休息后，以最大努力记录相同速度的离心动作后立即进行的向心动作的扭矩值。在不同踝关节位置获取平均值，并在不同范围内进行平均。先进行离心动作再进行向心动作所产生的扭矩值平均比单独的向心动作大约大100%。肌电图活动较低或没有变化。得出的结论是，本方法可用于跖屈拉长-缩短周期的研究以及下肢残疾人群弹性成分行为的测试。
