title: Plasma LDH and CK activities after 400 m sprinting by well-trained sprint runners.
abstract: 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 (r = -0.56, P less than 0.05), but the mean sprint velocity did not correlate with peak blood lactate concentration (r = -0.09) or plasma LDH activity (r = -0.40). There was a significant negative correlation between mean sprint velocity and H type LDH isozyme activity (r = -0.66, P less than 0.05), and a significant positive correlation with M type LDH isozyme activity (r = 0.66, P less than 0.05). 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.
mesh_terms: D000293:Adolescent; D000328:Adult; D003402:Creatine Kinase / Q000097:blood*; D006801:Humans; D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase / Q000097:blood*; D008297:Male; D010806:Physical Education and Training; D012420:Running; D013997:Time Factors
chemical_list: D007527:Isoenzymes; D007770:L-Lactate Dehydrogenase; D003402:Creatine Kinase