Adequate shoulder girdle strength is important to ensure a football player`s success and safety. Accurate and easy measurement of shoulder strength would help identify deconditioning trends and monitor the effects of injury or rehabilitation. The purpose of this study was to document variations in shoulder abduction strength in football players during a 10-week season using a portable strain gauge device. Bilateral shoulder abduction strength of 59 players was measured at the season`s start, midpoint, and near end. Strength dropped approximately 28% on each side, with most of the loss being in the first 5 weeks. The strength loss was also more rapid on the left side, making the side-to-side strength ratio unstable throughout the season. It is recommended that in-season shoulder girdle rengthening be emphasized and that if shoulder strength measurements are to be used for exercise prescription or injury rehabilitation purposes, serial baseline measurements be made during the season.
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