Muscle pain after resistance activities, which occurs due to the destruction of sarcolema, increases the serum levels of LDH and CK enzymes as indicators of muscle damage. The results have shown that the use of food supplements such as glutamine can be useful in reducing the serum indicators of muscle damage. The aim of the present study is to determine the effect of glutamine supplementation on serum indicators of muscle damage, including the serum levels of LDH and CK enzymes following a session of resistance activity. The present experimental study was carried out using an animal model in the form of a 3 group’s research design with a control group. To this end, 30 six-week-old adult male Wistar rats were kept under controlled conditions for 2 weeks and were then divided into three equal groups, including control, and resistance activity with/ without glutamine supplementation. The glutamine supplementation group received the prepared emulsion by gavage of 200 mg/kg of body weight. After five days, both experimental groups participated in a session of resistance activity (namely, climbing a smooth ramp with one and a half meters height and a 85° decline) with 4 sets, 5 repetitions, 30 seconds of rest between repetitions and 2 minutes of rest between sets. The initial load was considered equal to 50% of the rats' body weight. One-way analysis of variance and Bonferroni's post hoc test were used at a significance level of p ≥ 0.05. The levels of CK and LDH enzymes were different in groups. A five-day glutamine supplementation before performing a session of resistance activity can cause a lower increase in the serum levels of CK and LDH enzymes as serum indicators of muscle damage, which indicates the protective effect of glutamine in maintaining the integrity and structure of cell membrane. Manuscript profile

It seems that the release of IL-6 from the contracting muscles and accumulation in the blood circulation has a close relationship with the duration and intensity of physical activity. The aime of this experimental study was to determine the effects of eight weeks of submaximal running and high-fat diet on IL-6 gene expression levels in the muscle tissue of an animal model. At the end of the two-week period of keeping under controlled conditions, 40 two-month-old male rats were randomly divided into four equal groups of control, high-fat diet, submaximal running, and a combination of high-fat diet and submaximal running. The training groups participated in the aerobic running protocol on the treadmill for five days a week for eight weeks. The polymerase chain reaction method was used to determine the levels of IL-6 gene expression in muscle tissue. One-way analysis of variance was used to determine between-group differences. The effects of high-fat diet and running with submaximal intensity on IL-6 gene expression in muscle tissue are significant. The consumption of high-fat food causes adverse changes in the expression of IL-6 gene, but eight weeks of running with sub-maximal intensity moderates the adverse effects of high-fat diet and creates favorable changes in the expression of IL-6 gene and body weight. Manuscript profile