Exercise Physiology
Siamak Rahbar; Sajad Ahmadizad; Hiwa Rahmani
Abstract
Objective: To investigate the effect of L-arginine supplementation on platelet indices in response to a high intensity interval exercise.Methods: Ten healthy overweight young men (BMI=27 ± 1.2 kg/m2) participated voluntarily in this cross-over and double-blind study, and performed a high intensity ...
Read More
Objective: To investigate the effect of L-arginine supplementation on platelet indices in response to a high intensity interval exercise.Methods: Ten healthy overweight young men (BMI=27 ± 1.2 kg/m2) participated voluntarily in this cross-over and double-blind study, and performed a high intensity interval exercise (HIIE) protocol with L-arginine supplementation or placebo, where, two trials were separated by seven days. In each session, the subjects consumed 0.075 g per kg body weight of supplement or placebo which was dissolved in 400 ml of water, and 90 minutes later, performed HIIE as 12 intervals of 3-minute on treadmill (activity: 1-min, 100% of vVO2max, recovery: 2-min, 40% of vVO2max). To measure platelet indices including mean platelet volume (MPV), platelet count (PLT), plateletcrit (PCT) and platelet distribution width (PDW), three blood samples were taken before supplementation and immediately before and after HIIE.Results: Regardless of the type of supplement, HIIE increased PLT and PCT by 29 and 31%, respectively (P < 001), but did not have a significant effect on MPV and PDW. Furthermore, consumption of L-arginine 90 min prior to HIIE, inhibited PCT (P = 0.043) but had no effect on PLT.Conclusion: Intermittent nature and recovery periods in HIIE protocol did not significantly increase MPV and PDW in both sessions, which may be a reason for the safety of the HIIE. L-arginine supplementation prior to HIIE only reduced PCT, due to its inability to affect other indices, to achieve more accurate results further studies with more effective doses of supplementation are needed.
Minoo Bassami; Banipal Tataroo; Sajad Ahmadizad
Abstract
Purpose: The present study was designed to investigate the effects of L-Arginine supplementation on fat and carbohydrate metabolism during high intensity interval exercise (HIIE) in overweight individuals. Methods: Ten male overweight students performed two HIIE trials including 10 intervals of 3 min ...
Read More
Purpose: The present study was designed to investigate the effects of L-Arginine supplementation on fat and carbohydrate metabolism during high intensity interval exercise (HIIE) in overweight individuals. Methods: Ten male overweight students performed two HIIE trials including 10 intervals of 3 min encompassed 1 min running at 100% of vVO2max and 2 min active recovery at 40% of vVO2max. In each session subjects consumed either supplement or placebo 90 min prior to exercise. Before and after supplementation and immediately after exercise glucose, insulin, non-esterified free fatty acid (NEFA) and triglyceride were measured. Oxygen consumption and exhaled carbon dioxide were collected to calculate fat and carbohydrate oxidation. Results: There were no significant differences between two trials for glucose, insulin, NEFA, triglyceride and fat oxidation (P>0.05). However, carbohydrate oxidation rate was significantly different between two sessions (p < 0.05). In addition, glucose and carbohydrate oxidation were significantly increased following HIIE irrespective of L-Arginine supplementation (p < 0.05). Conclusions: Based on the findings of present study it could be concluded that L-Arginine supplementation leads to increases in carbohydrate oxidation during HIIE in overweight men, but has no effect on resting at metabolism.
