Louie J K, Mote C D
J Biomech. 1987;20(3):281-300. doi: 10.1016/0021-9290(87)90295-8.
The relationships between the mean rectified EMG from two muscle groups crossing the knee joint and the rotational stiffness and laxity about the longitudinal axis of the lower leg were investigated. The EMG signals from three of the quadricep muscle group and two of the hamstring muscle group were monitored using surface electrodes. Each subject sustained self-induced muscle activity from specific muscle combinations while the foot was twisted internally and externally by the researcher. Joint rotation was measured using an electrogoniometer. Analyses of the data showed increased joint stiffness with increased numbers of active muscles. The stiffness measurements ranged from 0.16 to 2.54 Nm degree-1 depending upon the combination of active muscles. The stiffness measured in different tests were very repeatable with standard deviations ranging from 0.02 to 0.25 Nm degree-1. Increases in joint stiffness of over 400% by activation of these muscles were measured.
研究了跨越膝关节的两组肌肉的平均整流肌电图与小腿纵轴旋转刚度和松弛度之间的关系。使用表面电极监测股四头肌组中的三块肌肉和腘绳肌组中的两块肌肉的肌电图信号。在研究人员将脚向内和向外扭转时，每个受试者保持特定肌肉组合的自我诱导肌肉活动。使用电子测角仪测量关节旋转。数据分析表明，随着活跃肌肉数量的增加，关节刚度增加。根据活跃肌肉的组合，刚度测量值范围为0.16至2.54 Nm·度⁻¹。不同测试中测得的刚度具有很高的可重复性，标准差范围为0.02至0.25 Nm·度⁻¹。通过激活这些肌肉，测得关节刚度增加超过400%。
