The effect of glutamine supplementation on delayed onset muscle soreness and electromyographic activity after eccentric contraction in untrained men

The multiple roles of dietary protein and key amino acids such as leucine and glutamine create a variety of potential applications for athletes. Therefore, the purpose of the present study was to examine the effect of glutamine supplementation on delayed onset muscle soreness and electromyographic activity (Mean power frequency, Median frequency) after eccentriccontraction in untrained men. Seventeen healthy men (age: 22.35 ±2.27 yr; body mass: 69.91 ±9.78 kg; height: 177.08 ±4.32 cm) were matched and randomized; double-blind study with subjects assigned to either a glutamine supplementation (n=9) or placebo (n=8) group (0.1gr.Kg-1). The subjects in two groups were asked to take three times in week for 4 weeks. Each subject was screened for dietary habits before inclusion into the study. Participants performed 6 sets to exhaustion eccentric leg extensions at 75% of 1RM and rest intervals were 3 minute among sets. Creatine kinase and EMG activity measurements were taken before exercise protocol and 24 and 48 hours afterwards. There was no statistically significant difference between groups in creatine kinase, EMG activity, knee range of motion, perceived muscle soreness and maximal voluntary contraction (P>0.05). The results indicate that glutamine supplementation has no significant effect on muscle injury markers in between groups.