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Serum creatine kinase (CK) activity before and 24 h after unaccustomed knee extensor resistance loading indicating modest muscle damage. Values are least squares (adjusted) means + SE. *Within-age group change in serum CK after resistance loading, P < 0.05. ‡Different from AGE40 and AGE61 at respective time point, P < 0.05. #Main effect of age group, P < 0.05.
