Changes in Plasma Enzyme Activity Elicited by Running Exercise in the Dog 1

Summary In the conscious dog, running exercise at a sufficient speed and gradient elicited increases in PCPK, PGOT, and PLDH. The duration of the exercise did not appear to be as important as the speed or grade in determining the plasma enzyme response. Following exercise, PLDH was elevated more frequently than PGOT. PCPK was elevated only after exercise at relatively high workloads. The changes in plasma enzyme activity did not appear to be directly related to the exercise heart rate or to the increases in rectal temperature or blood lactate concentration.