King Grub
2018-03-16, 10:22
The purpose of this study was to investigate the effects of L-arginine (L-arg) supplementation on muscle recovery process after a single session of high-intensity resistance exercise (RE). 20 healthy young adult (22.8 ± 3.4 y) participants were assigned to two groups (N = 10/group): a placebo-supplement group (PLA) or a L-arginine-supplement group (ARG). The groups completed a session of high-intensity RE (0h), and three subsequent fatigue tests sessions (at 24, 48 and 72 h post-exercise) to assess the time course of muscle recovery. During the tests sessions, we assessed the following dependent variables: number of maximum repetitions, electromyographic signal (i.e., root mean square [RMS] and median frequency slope [MF]), muscle soreness and perceived exertion, as well as blood levels of creatine kinase (CK) and lactate, and testosterone:cortisol ratio. Number of maximum repetitions increased at 48 and 72 h post-exercise in both groups (time P < 0.05). CK levels and muscle soreness increased at 24 h post-exercise, which progressively returned to baseline at 72 h post-exercise in both gropus (time P < 0.05). Lactate levels increased immediately post-exercise, which reduced at 24 h post-exercise in both groups (time P < 0.05). Testosterone:cortisol ratio, RMS and MF slope remained unchanged during recovery period in both groups (time P > 0.05). No significant (P > 0.05) group x time interaction was found for all dependents variables during the recovery period. In conclusion, our data indicate that L-arg supplementation does not improve muscle recovery process following a high-intensity RE session in young adult subjects.
Appl Physiol Nutr Metab. 2018 Mar 15. L-arginine supplementation does not improve muscle function during recovery from resistance exercise.
Appl Physiol Nutr Metab. 2018 Mar 15. L-arginine supplementation does not improve muscle function during recovery from resistance exercise.