prolonged muscle shortening?

TPs can be active or latent. Active TPs have spontaneous pain, even at rest, and require treatment more often [37, 86– 88]. Latent TPs are only painful with palpation and can be associated with weakness, stiffness, restricted range of motion, or muscle stiffening. Latent TPs do not need treatment unless the TP begins to create active TPs characteristics or if the latent TPs becomes activated by mechanical overload and causes prolonged muscle shortening.

TPs可以是活动性/潜伏性的，活动性TPs有自发性疼痛，即使在静息时也是如此，需要更频繁的治疗^[37，86-88]。潜伏性TPs只有在触诊时才会出现疼痛，可能与无力、僵硬、活动范围受限或肌肉僵硬有关。潜伏性TPs不需要治疗，除非TPs开始活化、或潜伏性TPs因机械超负荷而激活并导致缩短的肌肉拉长。

stiffness与muscle stiffening有什么区别？

prolonged muscle shortening?拉长的肌肉缩短 还是 缩短的肌肉拉长?