Plasma LDH isozyme after 400-m sprinting in long-distance runners and untrained subjects

Plasma LDH activity and LDH isozyme following 400-m sprinting were determined in 8 long-distance runners and 7 untrained subjects. There is a significant correlation between the mean velocity of the 400-m sprint and LDH-5 or LDH-4+5 in the long-distance runners, but not in the untrained subjects.