Abstract des Autors

The aim of this study was to determine the effect of exercise mode on the blood lactate removal during recovery of high-intensity exercise. Nine male individuals performed the following tests in order to determine the blood lactate removal: Running - 2x200 m, the subjects ran at their maximum capacity, and rested 2 min between each bout. Swimming - 2x50 m, the subjects swam at their maximum capacity, and rested 2 min between each bout. Each test was realized on different days with three recovery modes: passive (sitting down), swimming, or running. Recovery exercise intensity was corresponding to the aerobic threshold. All recovery activities lasted 30 min. The two forms of active recovery were initiated 2 min after the end of high-intensity exercise and lasted 15 min, and were followed by 13 min of seated rest. After 1, 7, 12, 17, and 30 min of the end of high-intensity exercise, blood samples (25 micro-l) were collected in order to determine the blood lactate concentration. By linear regression, between the logarithm of lactate concentration and its respective time of recovery, the half-time of blood lactate removal (t1/2) was determined. Time of high-intensity exercise and the lactate concentration obtained in the 1st min of recovery were not different between running and swimming. Passive recovery (PR) following running (R-PR = 25.5+/-4.3 min) showed a t1/2 significantly higher than PR after swimming (S-PR = 18.6+/-4.3 min). The t1/2 of the sequences running-running (R-R = 13.0 min), running-swimming (R-S = 12.9+/-3.8 min), swimming-swimming (S-S = 13.2+/-2.8 min), and swimming-running (S-R = 8.1+/-1.3 min) were significantly lower than the t1/2 of the R-PR and S-PR. There was no difference between the t1/2 of the sequences R-R, R-S, and S-S. On the other hand, the sequence S-R showed a t1/2 significantly lower than the sequences S-S and R-R. It was concluded that the two forms of active recovery determine an increase in the blood lactate removal, regardless of the mode of high-intensity exercise performed previously. Active recovery performed by the muscle groups that were not previously fatigued, can improve the blood lactate removal. Verf.-Referat