DYNAMICS OF HUMAN ANKLE STIFFNESS - VARIATION WITH MEAN ANKLE TORQUE
DYNAMICS OF HUMAN ANKLE STIFFNESS - VARIATION WITH MEAN ANKLE TORQUE
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DOI：
10.1016/0021-9290(82)90089-6
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发表时间：
1982-01-01
影响因子：
2.4
通讯作者：
KEARNEY, RE
中科院分区：
文献类型：
--
作者：
HUNTER, IW;KEARNEY, RE
5人受试者的左脚旋转在一个固定的随机模式约一个恒定的踝关节角度和反对这些扰动的力量进行了测量。计算了踝关节角位置与踝关节扭矩之间的动态刚度传递函数。刚度增益在低频处是平坦的，在中频处具有共振谷，并且在高频处以约40 dB/decade上升。低频增益和共振频率随着紧张性肌肉活动的增加而逐渐增加。踝关节的动态刚度是由一个线性的，欠阻尼的，二阶传递函数的惯性，粘性和弹性项。惯性参数的估计是独立的肌肉活动的水平，而粘性和弹性参数的平均扭矩水平的增加而增加。
The left foot of 5 human subjects was rotated in a fixed stochastic pattern about a constant ankle angle and the forces opposing these perturbations were measured. The dynamic stiffness transfer functions relating ankle angular position to ankle torque were calculated. Stiffness gain was flat at low frequencies, had a resonant valley at intermediate frequencies and rose at about 40 dB/decade at high frequencies. The low frequency gain and resonant frequency increased progressively with increases in tonic muscular activity. The dynamic stiffness of the ankle was well described by a linear, under-damped, 2nd-order transfer function having inertial, viscous and elastic terms. Estimates of the inertial parameter were independent of the level of muscle activity whereas the viscous and elastic parameters increased with increases in mean torque level.