Ali Mostafaloo; Seyed Alireza Hosseini Kakhak; Amir Hossein Haghighi
Abstract
Background and Purpose: Resistance exercises with new methods such as blood flow restriction (BFR) that are performed with lower intensities compared to traditional resistance exercises, it can have more favorable effects on muscle strength and size. Therefore, the aim of the present study was to investigate ...
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Background and Purpose: Resistance exercises with new methods such as blood flow restriction (BFR) that are performed with lower intensities compared to traditional resistance exercises, it can have more favorable effects on muscle strength and size. Therefore, the aim of the present study was to investigate the study adaptability of testosterone and growth hormones in response to eight weeks of eccentric resistance training with and without blood flow restriction. Method: In this study, 40 soccer players participated in a semi-experimental research design. Subjects in the present study were randomly divided into four groups: eccentric resistance training with BFR (n=10), eccentric resistance training without BFR (n=10), traditional resistance training (n=10) and control (n=10). To assess the strength of the upper body muscles and leg muscle strength were used from bench press and leg press tests, also, before and after an eight-week training period, blood samples were taken to determine the concentration of testosterone and growth hormones. A one-way repeated-measures and Bonferroni post hoc test was used to compare the groups (P≥0.05).Results: The results of the study showed that none of the training programs had a meaningful effect on serum testosterone level (P= 0.27), and growth hormones (P= 0.88).Conclusion: In general, it can be said that there was no significant difference among the three training methods in improving the effects of resistance training. Therefore, despite the fact that eight weeks of eccentric training didn't affect the compatibility of testosterone and growth hormones, it probably caused favorable changes in the strength of male football players.
Masoud Jamshidi Hossein Abadi; Ali Jamshidi Hossein Abadi; Naser Behpoor
Abstract
Background and Aim: During the last decades, the importance of amino acid supplementation has been recommended to improve exercise performance. The aim of this study was to investigate the effect of L-arginine supplementation on growth hormone, lactate and glucose responses to aerobic activity ...
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Background and Aim: During the last decades, the importance of amino acid supplementation has been recommended to improve exercise performance. The aim of this study was to investigate the effect of L-arginine supplementation on growth hormone, lactate and glucose responses to aerobic activity in boy students. Materials and Methods: Participants were included 10 athlete students with age: 18-16 years old. This research was a randomly semi-experimental double-blind study which established in a basic and two supplementation (0.1 gr per kg/body weight) and placebo (Starch) situations. The subjects participated in three phases of aerobic activity (running at intensity of 15th Borg scale equal to 80-70percent of maximum heart rate for 30 minutes. The first phase was done before receiving of supplementation and placebo and the second and third phases were done after receiving three days supplementation and placebo. Blood samples were collected during the first phase before and after aerobic test, but in the second and third phases after receiving three days supplementation and placebo immediately after aerobic running. For extraction of results the ANOVA with repeated measures and paired t-test were applied and the significant level set as p<0.05. Results: The result showed the significant increase in growth hormone after consuming supplementation with exercise (p=0.0001), but no significant change was observed for blood glucose (p=0.11) and blood lactate (p=0.09). Conclusion: Consumption (0.1 gr/kg) of Arginine supplementation indicated significant effect on growth hormone response to aerobic exercise.; but it was not true for both lactate and glucose serum. Therefore, it can be suggested the higher doses and longer periods for consumption of this supplement.
