Baseball pitchers, volleyball spikers have something in common: Similar shoulder, elbow injuries
Source: Science Daily
Baseball and volleyball players share the similar arm injuries due to overuse of their shoulders and elbows. In both circumstances, the shoulder muscles generate and transmit an incredible amount of energy and serve as the transition point where built up energy is transferred from the rest of the body down the arm. After too many pitches or serves, these shoulder muscles get overworked and tend to cause the shoulder to tighten up.