Stiffness is usually used to characterize the stability of our limb posture. Reflex pathways significantly contribute to muscle stiffness. It is one of the three individual stiffness components: intrinsic, passive and reflex. 刚度是一个常常用来刻画上肢姿势稳定性的物理量,它由三个部分组成:内部主动分量、被动分量、和反射引起的刚度。