effect of l-glutamine supplementation on electromyographic activity of the quadriceps muscle injured by eccentric exercise

objective(s): the purpose of the present study was to examine the effects of l-glutamine on electromyographic (emg) activity of the quadriceps muscle injured by eccentric exercise (ee).   materials and methods: seventeen healthy men (age: 22.35±2.27 yr; body mass: 69.91±9.78 kg; height: 177.08±4.32 cm) were randomly and double-blind study with subjects assigned to either an l-glutamine supplementation (n=9) or placebo (n=8) group. the subjects in two groups were asked to take three times during a week for 4 weeks. each subject was screened for dietary habits before inclusion into the study. participants performed 6 set to exhaustion eccentric leg extensions at 75% of 1rm and rest intervals were 3 min among sets. pain assessment scale (pas), emg activity and range of motion (rom) measurements were taken before exercise protocol and 24 and 48 hr afterwards. results: there was no statistically significant difference between groups in perceived muscle soreness (sor), rom and emg activity (p < 0.05). conclusion: the results indicate that l-glutamine supplementation has no significant effect on muscle injury markers in between groups, although glutamine supplementation attenuated delayed onset muscle soreness (doms) effects in sup group.