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Background: The aim of this study was to investigate the response of the most important angiogenic and angiostatic factors to a session activity before and after a period of L-Arginine supplementation in active men.

Materials and Methods: In this practical and semi experimental study, 22 active men were selected by convenience sampling method and they were randomly assigned into supplement (n=11) and placebo (n=11) groups. Baseline levels of VEGF and endostatin were measured, then subjects participated an exhaustive treadmill protocol in pre-test and post-test. Immediately and two hours after the protocol, 3 cc blood samples were prepared. The subjects used daily 0.1 g.kg^-1 respectively taking l-arginine and placebo for 14 days. The results were analyzed at the significant level (p<0.05).

Results: Immediately after exercise, the levels of VEGF and VEGF to endostatin ratio were significantly decreased in both groups compared to baseline (p≤0.05), and two hours later this change were lower than the baseline value (p≤0.05). The levels of endostatin immediately after exercise were significantly increased in both groups compared to baseline (p≤0.05) and two hours later this change were lower than the baseline value (p≤0.05). Before and after L-Arginine supplementation, the levels, of VEGF and VEGF to endostatin ratio immediately after exercise were not significant(p≥0.05). while this change in the supplementation group were significantly increased two hours after exercise (p≤0.05). There was no significant change in the levels of endostatin between two groups immediately after exercise (p≥0.05); however, these changes were significantly decreased two hours after exercise (p≤0.05).

Conclusion: It seems that short-term L-arginine supplementation probably stimulate angiogenesis factors in response to exercise in active men.

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Background and Aim: Exercise aerobic is associated with increased creatine kinase and blood lactate immediately after exercise, leading to increased muscle damage and undesirable changes in many cellular markers including serum creatine kinase. In such situations, consuming nutrients and supplements such as coenzyme Q10 may prevent metabolic stress damage by increasing buffering power. However, comprehensive studies have not been performed on the effects of this nutrient on the index of muscle injury and fatigue caused by exercise.
Methods & Materials: For this purpose, 20 inactive volunteer men were randomly divided into two groups of 10-person Coenzyme Q10 supplement (2.5 mg/kg body weight) and quasi-drug (2.5 mg/kg body weight Dextrose). All subjects participated in the Bruce test exercise contract after 14 days of supplementation. Blood sampling was performed in four stages including baseline, after supplementation, immediately after exercise and two hours after exercise. Creatine kinase, lactate and cortisol indices of both groups were measured during these four stages. Data were analyzed by means of standard deviation and repeated measures ANOVA, Bonferroni post hoc and Independent T-test using SPSS V. 17 at the significant level of 0.05.
Ethical Considerations: This article has been approved by the ethics committee of Tabriz School of Medical Sciences with the ethics code IRCT 201203104663N8.
Results: The results showed that 14 days of Coenzyme Q10 supplementation had a significant effect on cortisol level (P<0.05). In addition, one session of exhausting aerobic activity increased creatinine kinase and lactate (P<0.05). On the other hand, creatinine kinase did not differ significantly after exercise (P>0.05). 
Conclusion: According to the results of the present study, 14-day supplementation of Coenzyme Q10 may reduce the cellular damage induced by exhaustive aerobic activity in inactive men and prevent an increase in blood lactate levels.