Hormonal and enzymatic functions in exercise
Javad Vakili; Saeed Nikookheslat; Mohammad Tanhaei; maryam akbari
Abstract
Objective: Training with blood flow restriction likely have a profound effect on growth related hormonal indices. The purpose of this study was to determine the effect of two weeks intermittent training with and without blood flow restriction on serum levels of growth hormone, IGF-1 and Lactate in amateur ...
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Objective: Training with blood flow restriction likely have a profound effect on growth related hormonal indices. The purpose of this study was to determine the effect of two weeks intermittent training with and without blood flow restriction on serum levels of growth hormone, IGF-1 and Lactate in amateur adolescent football players. Methodology: Therefor 24 amateur adolescent football players with age of 17/79±0/79 years-old, height of 175/41 ± 3/37 cm and weight of 69/12±4/49 kg were voluntarily selected and divided based on VO2max into two groups of control and experimental groups. The training protocol was performed in treadmill with intensity of 60-75% MHR, four sessions per week, in 400 meters, three sets in first week and four sets in second week. Recovery intervals was 60-80 seconds between exercise intervals. The thigh cuff pressure was set between 140 and 180 mmHg. Blood samples were gathered in two phases before of training protocol and 48h after last session of training for analyses of serum GH, IGF-1 levels and lactate immediately after the RAST anaerobic test. Independent and dependent T-test was used for data analyzing and significant level was set at p<0/05. Results: There was a significant increase in serum GH (p=0/016) and lactate (p=0/000) in BFR group. But there weren’t any difference between two group in serum IGF-1 after BFR and nonBFR training (P >0/05).Conclusion: it is concluded that intermittent trainings with BFR probably be more effective in enhancing adolescent’s growth indicators than intermittent training.
J Vakili; f Halal Khor; M Aghaei
Abstract
Aim: : Exercise training with blood flow restriction (BFR)is a modern method of training that has been developed in two recent decades and has been used for improvement of performance. Therefore, this study was conducted to identify the effect of 4 weeks rock climbing with blood flow restriction on athletic ...
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Aim: : Exercise training with blood flow restriction (BFR)is a modern method of training that has been developed in two recent decades and has been used for improvement of performance. Therefore, this study was conducted to identify the effect of 4 weeks rock climbing with blood flow restriction on athletic performance and some muscle damage indictors in elite rock climbers. Method: : In a semi experimental research method, 12 male and 12 female elite rock climbers with at least 4 years rock climbing experience and age range of 23 to 27 years and a fat percentage of 10 to 20 percent purposefully selected among the climbers, and allocated in two equal BFR and none-BFR groups. Both groups performed 4-week rock climbing training program consisting three sessions per week and each session was 90 minutes, severity of each session was 60 to 80% of climbing grades. Blood samples were obtained in baseline and after four weeks of climbing training to determine the amount of lactate dehydrogenase (LDH), creatine kinase (CK) and lactate. Also, hand grip, explosive anaerobic power, body fat percent, adduction strength in upper body and degree of climbing was measured. For data analysis, independent T test was used at α ≤ 0.05. Results: After 4 weeks of climbing with and without limitation of blood flow, the index of muscular damage of LDH, CK did not show significant difference in response to climbing exercise. But lactate level was lower in BFR rather than NBFR. There are not any difference in Hand Crip strength, explosive anaerobic power, body fat percent, adduction strength in upper body between BFR and NBFR groups. But in degree of climbing, the result showed the better performance in BFR than NBFR (P <0.05). Conclusion: According to the results of this study, rock climbing training with or without BFR, do not increase muscular damage. and it could influence on performance.
