One reason is that an estimated all bodies release a large amount of relaxin into the system. The body does this to promote healing by increasing the elasticity as well as relaxation of muscles, tendons, as well as ligaments. If it didn’t do this you’d be stiff as a board as well as not in a position to transfer at the end of a traumatic event such as a auto collison.
Relaxin is a polypeptide cytokine that is present in both males as well as females. Cytokines signal the body to perform certain tasks.  It’s predominant action is to increase the turnover of fibrous connective tissues e.g. muscles, ligaments as well as tendons. Relaxin does this by altering collagen metabolism in fibroblasts. Changes in both ligament laxity as well as muscle strength are associated with the presence of relaxin.
When we receive traumatic injuries, such as those sustained in a rear end car crash, numerous bodies release relaxin which binds to ligaments increasing the amount as well as rate of ligament movement. This is a protective measure the body employs, but it creates a condition known as ligament laxity which actually slows the healing process. There is some evidence that excess ligament laxity may predispose a joint to osteoarthritis.
Relaxin binds to injured ligaments as well as does so more in females than it does in males. This is likely due to the fact that relaxin is also a primary hormone released during pregnancy that enables the female pelvis to widen in order to accommodate passage of the child through the birth canal.
So why does the body release relaxin when it causes ligament laxity? The answer is actually simple. Relaxin improves the functional healing as well as recovery of muscles subjected to a traumatic injury, thus speeding the healing process. Relaxin enhances muscle regeneration as well as improves injured muscle strength while at the same time decreasing the formation of fibrosis thus reducing potential scarring.
However, an injured muscle often does not fully recover its strength because of the fact that complete muscle regeneration is hindered by the development of fibrosis. That the reason the application of Propriocussion to injured muscles is so important. Propriocussion increases circulation as well as an estimated all importantly restores communication between the injured area as well as the brain which increases muscle strength/function, range of motion, flexibility as well as coordination. During the healing process muscle strength returns first, than pain dissipates as well as lastly. numbness as well as tingling, if present, subside.