et diminue les courbatures
Oral L-glutamine supplementation on muscle recovery following eccentric exercise: are there sex differences?
D.S. Kimmerly, N. Bagnall, and Z. Legault Applied Physiology, Nutrition, and Metabolism
Volume: 39, Number: S1 (2014) S25
L-Glutamine has become an increasingly popular supplement among
athletes because of its alleged benefits of promoting muscle recovery
following exercise. This study aimed to examine the effects that oral
L-glutamine supplementation has on quadriceps muscle strength and
soreness ratings following eccentric exercise. It was hypothesized that
L-glutamine ingestion would quicken the recovery rate of peak force
production (back to pre-exercise values) and decrease muscle soreness
ratings over a 96-hour recovery period.
Ten healthy participants
(5 females; age: 21±0.3 years; height: 174±9 cm; weight: 74±8 kg) volunteered
in a double blind, randomized, placebo-controlled crossover
study. Supplement conditions consisted of isocaloric placebo (maltodextrin,
0.6 g/kg/day) and micronized L-glutamine (0.3 g/kg/day-1
0.3 g/kg/day maltodextrin) ingestion over a 72-hour period. Knee extensor
peak torque at 0, 30, and 180 deg/sec (Cybex®Isokinetic Dynamometer)
and muscle soreness (7-point Likert scale) were measured
before, immediately following, 24, 48, 72, and 96 hours after a bout of
eccentric exercise. The eccentric exercise bout consisted of 8 sets
(10 repetition per set) of unilateral knee extension at 125% maximum
concentric force with 2-minute rest intervals between sets. L-Glutamine
supplementation resulted in greater overall (main effect, p < 0.01)
post-exercise peak torque values at 180 deg/sec and 30 deg/sec.
Peak torque produced at 180 deg/sec was higher (p < 0.05) in the
L-glutamine condition immediately following, 72 and 96 hours postexercise.
However, these effects were greater in men versus women.
L-Glutamine resulted in lower (p < 0.05) muscle soreness ratings 24,
48, and 72, 96 hours post-exercise. Oral L-glutamine supplementation
resulted in a faster recovery of dynamic peak torque and diminished
muscle soreness following eccentric knee extension exercise. Greater
effects of oral L-glutamine supplementation on muscle recovery were
observed in men versus women.