Reconstruction of equilibrium trajectories during whole-body movements

被引:15
作者
Domen, K [1 ]
Latash, ML [1 ]
Zatsiorsky, VM [1 ]
机构
[1] Penn State Univ, Biomech Lab 200, Dept Kinesiol, University Pk, PA 16802 USA
关键词
D O I
10.1007/s004220050517
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
The framework of the equilibrium-point hypothesis was used to reconstruct equilibrium trajectories (ETs) of the ankle, hip and body center of mass during quick voluntary hip flexions ('Japanese courtesy bow') by standing subjects. Different spring loads applied to the subject's back were used to introduce smooth perturbations that are necessary to reconstruct ETs based on a series of trials at the same task. Time patterns of muscle torques were calculated using inverse dynamics techniques. A second-order linear model was employed to calculate the instantaneous position of the spring-like joint or center of mass characteristic at different times during the movement. ETs of the joints and of the center of mass had significantly different shapes from the actual trajectories. Integral measures of electromyographic bursts of activity in postural muscles demonstrated a relation to muscle length corresponding to the equilibrium-point hypothesis.
引用
收藏
页码:195 / 204
页数:10
相关论文
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