Influence of physical exercise on plasma creatine kinase activity in healthy and dystrophic turkeys and sheep.

Plasma creatine kinase (P-CK) activities were significantly increased after physical exercise in healthy turkeys and in turkeys with genetic muscular dystrophy. Activities as high as 100,500 mU/ml of plasma were observed. Activities remained high for at least 29 hours after exercise. Moderate exercise did not significantly affect P-CK activity in lambs. Increases in P-CK activity during expression of nutritional muscular dystrophy were readily distinguished from exercise effects; activity exceeded 160,000 mU/ml in lambs during expression of that condition.