Creatine Kinase Levels are Elevated During 2-A-Day Practices in Collegiate Football Players

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Objective: To determine blood serum creatine kinase (CK) levels in football players undergoing 2-a-day football practices and to determine if CK levels are related to fitness. Our hypotheses were that CK levels in each subject would increase over the course of practices and that higher levels of fitness would result in smaller increases in CK.

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