The effects of a graded exercise session on creatine kinase (CK) blood levels in the older adult
Sefton, Rebecca J.
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The purpose of this project was to examine the effect of a one-time graded exercise session on creatine kinase (CK) levels in the older adult. The goal was to determine the level of exercise intensity which maximally benefits the older adult without evidence of muscle tissue damage. Eight volunteers were obtained from the DeKalb YMCA and the NIU Recreational Center's senior citizens exercise programs. Each volunteer exercised on a treadmill for a total of ten minutes, not inclusive of warm-up and of cool down periods, at a Maximal Predicted Heart Rate (MPHR) of either 50% (four volunteers) or 75% (four volunteers). Three blood samples (immediately following exercise, 24 hours following exercise, and 32 hours following exercise) were taken. The samples were analyzed for CK levels and CK-MB (form of CK) levels using the Kodak Ektachem analyzer. The results showed an increase in total CK levels in the 50% group between the second and third blood samples, and a decrease was seen in CK-MB levels in the 75% group between the second and third blood samples. It was concluded that exercise at a 50% MPHR was enough to produce skeletal muscle damage in the unconditioned older adult.