Effect of anaerobic exercise on serum enzymes of young athletes.

The purpose of the study was to investigate the effect of anaerobic exercise on serum enzymes lactate dehydrogenase (LDH), creatine phosphokinase (CPK), and aspartate aminotransferase (AST) on elite junior male (n = 5) and female (n = 5) alpine skiers who ranged in age from 12 to 15 years. An intensive treadmill run to exhaustion (10.5 km.hr-1, 20% grade) was performed. Blood samples were drawn from the antecubital vein before and 5 min after the exercise. None of the enzyme activities had changed after exercise, and the performance time of treadmill run (male: 53.0 sec and female: 52.6 sec) was similar between groups but the serum CPK activities of the boys were consistently higher than those of the girls and the differences were significant (p less than 0.05).