This study aimed to investigate the rate of passive torque variations of human knee joint in the different velocities of knee flexion and extension movements. Ten healthy men were invited to participate in the tests. All passive torque tests were performed for the knee joint extension and flexion on the sagittal plane in three different angular velocities of 15, 45, and 120°/s; in 5 consecutive cycles; and within 0° to 100° range of motion. The electrical activity of knee joint extensor and flexor muscles was recorded until there was no muscle activity signal. A Three-element Solid Model (SLS) was used to obtain the viscose and elastic coefficients. As the velocity increases, the stretch rate in velocity-independent tissues increases, and the stretch rate in velocity-dependent tissues decreases. By increasing the velocity, the resistance of velocity-dependent parts increases, and the velocity-independent parts are not affected by velocity. Since the first torque that resists the joint movement is passive torque, the elastic and viscous torques should be simultaneously used. It is better to perform the movement at a low velocity so that less energy is lost. The viscoelastic resistance of tissues diminishes.

本研究旨在研究在膝关节屈伸运动的不同速度下人体膝关节的被动扭矩变化率。十名健康男性被邀请参加测试。所有被动扭矩测试均以15、45和120°/s三种不同角速度对膝关节在矢状面上的伸展和屈曲进行；连续5个周期；并且在 0° 到 100° 的运动范围内。记录膝关节伸肌和屈肌的电活动，直到没有肌肉活动信号。三元实体模型 (SLS) 用于获得粘胶系数和弹性系数。随着速度的增加，与速度无关的组织中的拉伸率增加，而与速度相关的组织中的拉伸率下降。通过提高速度，与速度相关的部分的阻力增加，与速度无关的部分不受速度的影响。由于抵抗关节运动的第一个扭矩是被动扭矩，因此应同时使用弹性和粘性扭矩。最好以低速进行运动，这样损失的能量就会更少。组织的粘弹性阻力减弱。