Milner T E
School of Kinesiology, Simon Fraser University, Burnaby, British Columbia Canada.
Exp Brain Res. 1993;93(1):177-80. doi: 10.1007/BF00227793.
The objective of this study was to characterize the mechanical behavior of the elbow joint during voluntary movement, for different speeds of movement and under different loading conditions. Torque pulses of 50 ms duration were applied at movement onset and at peak velocity on random trials. The displacement away from the unperturbed trajectory was used as an indicator of the relative compliance of the elbow under different conditions. We found that both the displacement and the time taken to return to the unperturbed trajectory decreased if the overall speed of the movement increased or if a viscous resistive load was added, implying lower joint compliance. It was possible to account qualitatively for differences in mechanical behavior from observed muscle activation patterns.
本研究的目的是表征肘关节在自主运动过程中的力学行为，包括不同运动速度和不同负荷条件下的情况。在随机试验中，在运动开始和峰值速度时施加持续50毫秒的扭矩脉冲。偏离未受干扰轨迹的位移被用作不同条件下肘关节相对顺应性的指标。我们发现，如果运动的整体速度增加或添加粘性阻力负荷，位移和回到未受干扰轨迹所需的时间都会减少，这意味着关节顺应性降低。从观察到的肌肉激活模式可以定性地解释力学行为的差异。
