Abstract des Autors

Blood lactate concentration and the activities of plasma LDH and CK were determined in 13 well-trained middle distance runners after a 400-m sprint. It was found that there is a significant relationship between mean velocity in the 400-m sprint and plasma CK activity, but the mean sprint velocity did not correlate with peak blood lactate concentration or plasma LDH activity. There was a significant negative correlation between mean sprint velocity and H type LDH isozyme activity, and a significant positive correlation with M type LDH isozyme activity. These results suggest that the magnitude of enzyme efflux from tissue into blood may be depressed by training, and that in well-trained sprinters plasma CK and LDH isozyme activities may be better indicators of physical training and/or physical performance than peak blood lactate or plasma LDH activities.