J Orthop Sports Phys Ther. 1987;9(3):56-69. doi: 10.2519/jospt.1987.9.2.56.
The mechanical aspects of delivering a baseball pitch are presented. To organize the sequence of events involved in pitching, the kinematics are.explained by the phases the pitcher passes through during the delivery. There are four categories of delivering a pitch. Each type of delivery has its own peculiar trunk actions and results in a definite and distinct axis of motion about which the moment arm rotates to provide torque to the pitched ball. Understanding the factors involved in formation of the moment arm and its relationship to the method of delivery enhances the therapist's ability to deal effectively with the total player when treating injuries from pitching or throwing a ball. J Orthop Sports Phys Ther 1987;9(2):56-69.
呈现了投球的力学方面。为了组织投球过程中涉及的事件序列，通过投手在投球过程中经历的阶段来解释运动学。投球有四种类型。每种投球类型都有其独特的躯干动作，并且会产生一个确定且独特的运动轴，力臂围绕该轴旋转，从而为投出的球提供扭矩。理解力臂形成的因素及其与投球方式的关系，可以提高治疗师在治疗投球或投球受伤时对整个运动员进行有效治疗的能力。J Orthop Sports Phys Ther 1987;9(2):56-69。
