Investigating The Interaction and Exclusive Effect Of 8 Week β-Hydroxy- β-Methyl Butyrate (HMB) Supplementation And Complex Training On Body Composition, strength, Testosterone/Cortisol ratio and muscle damage Indexes Of Elite Basketball Players Aged 19-26 Years Old

BACKGROUND: Taking advantage of the effects of strength training in the basketball training sessions, has significantly received more attention by coaches through recent decade, this issue has led to use different ways of exercises to increase strength; One of these methods is known for complex training (resistance and plyometric), that is performed during single training session and will avoid athletes from training on multiple sessions and also provide a wide range of various exercises through single session; on the other hand, ergogenic role of sport supplements are also an integral part of competitive sports; Beta-hydroxy-beta-methyl-butyric acid (HMB), an Intracellular metabolites derived from the branched chain amino acid Lucien, has attracted particular attention During the last 35 years due to its anabolic, anti-catabolic and anti-inflammatory features in field of sport; However, as contradict results found in the case of long-term interaction of these two factors as well as associated reports with the sport of basketball was scattered or scarce; Therefore, the aim of this study was to investigate the effect of Interaction and Exclusive Effect Of 8 Week β-Hydroxy- β-Methyl Butyrate (HMB) Supplementation And Complex Training On Body Composition, muscle damage Indexes And Testosterone/Cortisol ratio Of Elite Basketball Players Aged 19-26 Years Old. METHODS: In this semi-experimental, randomized, double-blind, placebo-controlled study with pre-test and post-test design, 40 male basketball players of Division 1 Basketball League aged 26-19 years were selected and randomly divided into four groups of 10 people, including: (1)Training-supplements(HMB), (2)Training-placebo group, (3)supplement(HMB) and (4) control group. Complex training protocols was performed in 8 weeks through 3 times a week (on odd days), on a regular basis by 60% to 80% of 1RM by all four groups, while at the same time four group attended their regular basketball trainings on 3 days of week (on even days). Data’s were expressed as mean (±SD) and analysis of variance (ANOVA), Bonferroni post hoc tests to evaluate differences between the four groups (for difference between groups) and dependent sample T-test for comparing the result of intra-group in different types in various times at the significant level of p 0.05 was performed. All statistical assessments were assessed by SPSS software (21v). RESULTS: The findings of this study showed that supplementation with HMB, complex training and having both of these two factors through a chronic protocol, resulting in anabolic stimulus for a significant increased levels of testosterone and ( testosterone )/cortisol ratio, (p 0.05), lean body mass (p 0.05) Based on BIA estimates and the percentage of upper and lower body strength (p 0.05), so that the process of the increase in supplementary-Training group was observed more than other groups, all these values was higher in the training group in comparison to supplement group as well. In turn, cortisol serum levels and also muscle damage indexes were decreased in same hierarchy of groups. CONCLUSIONS: Beta-hydroxy-beta-methyl butyrate supplementation and complex training separately contributed to preservation of muscle mass and strength increase and also lead to deliver anabolic, anti-catabolic and anti-inflammatory effects but the study indicates that the interaction of the these two factors might lead to a synergistic effect on athletic performance.