The purpose of this study was to examine how the muscle functions response for joint stability during baseball pitching. It was hypothesized that muscle contraction force contributed the most to balance external loading to keep joint stability. In the result of this study it was concluded, that this quantitative model used improves the understanding of the role of shoulder muscles in glenohumeral joint during the baseball pitching. Muscles not only play the movers but also stabilizers especially when joint had anterior/posterior and superior/posterior external loading. Future study may optimize muscles strengthening to maximize compressive forces to keep joint stability.
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