Reason of thoracic mobility training for increasing shoulder function and it's delaying benefits

Joint mobility plays a part in the performance of competitive sports. It can be used as a training or as a warm-up exercise alone. Good joint mobility can produce better power transmission and exert better competitive level. On the contrary, it may change movement pattern that produce more force on the other joint . Part of the shoulder injuries or discomfort is caused by poor thoracic mobility or shoulder rhythm dysfunction. In most studies, it is also showed that the increase in thoracic mobility can improve shoulder function, but it does not clearly indicate why shoulder function would change, so purpose of this study wants to know why increasing thoracic mobility can improve shoulder function and how long the benefits of thoracic mobility can be improved after training.