Effects of Isometric Exercise on Serum Creatine Phosphokinase Activity

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Abstract
The effect of isometric exercise on serum creatinine phosphokinase (CPK) activity in 14 psychotic patients in remission and ten normal controls was studied. The increases in serum CPK activity at 18 and 42 hours after exercise were no significantly different in patients and controls. The postexercise serum CPK activities in the patients were significantly less than the peak serum CPK levels when they were psychotic. There were no significant correlations between postexercise serum CPK activity and preexercise or peak serum CPK activity in the patient group. It is unlikely that increased isometric muscle tension is a major causative factor in the increased serum CPK levels frequently found in psychotic patients.

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