مقايسه اثر دو پروتكل بارگيري تمرين مقاومتي با و بدون مكمل‌گيري تريبولوس روي پاسخ‌هاي هورموني و قدرت عضلاني در افراد فعال جوان

Comparison of the Effects of Two Resistance Training Loading Protocols with & without Tribulus Supplementation on Hormonal Responses an‎d Muscle Strength in Young activists

فيزيولوژي ورزش

Introduction: Resistance training an‎d the type of training protocol are one of the most effective methods for increasing muscle strength, muscle growth, an‎d improving hormonal responses in the body. Nowadays, herbal supplements such as Tribulus terrestris have attracted the attention of athletes due to their possible effects on increasing testosterone an‎d improving athletic performance. The aim of the present study was to compare the effect of two resistance training loading methods with an‎d without Tribulus supplementation on the levels of testosterone, cortisol, maximum strength, lipid profile, an‎d body composition of active men. Methodology: This study was a quasi-experimental study with a pre-test an‎d post-test design with parallel groups. A total of 40 male volunteers (age range 25-35 years), after examining the entry conditions, were non-ran‎domly an‎d homogeneously divided into four groups of 10: the first group received resistance training loading (mean weight 90.97 ± 10.4 an‎d BMI 86.28 ± 6.1), with a constant intensity of 70% of one repetition maximum, the second group received resistance training loading (mean weight 85.6 ± 5.2 an‎d BMI 89.26 ± 81.0) with an intensity of 70% of one repetition maximum along with Tribulus supplementation, the third group received resistance training loading with a pyramidal pattern without supplementation (mean weight 89.72 ± 7.1 an‎d BMI 27.8 ± 5.1), an‎d the fourth group received resistance training loading with a pyramidal pattern along with Tribulus supplementation (mean weight 89.23 ± 9.3 an‎d BMI 27.37 ± 1.99). The training protocol was implemented for 8 weeks (3 sessions per week). The supplement groups consumed 2000 mg of Tribulus extract daily. Dependent variables included testosterone levels, cortisol by ELISA kits, lipid profile by enzymatic-calorimetric method, maximum strength in the chest press, squat, leg extention, leg curl movements by one-repetition maximum test, wrist muscle strength by dynamometer an‎d body fat percentage by body analyzer, measured in two stages before an‎d after the intervention. Data analysis was performed using analysis of covariance test at a significance level of 0.05. Findings: Resistance training in both patterns significantly improved maximum strength an‎d some blood indices, but maximum strength was observed to increase more in the pyramid training protocol groups an‎d Tribulus supplementation had no effect on strength. The increase in testosterone levels was greater in the supplement groups (P=0.017) an‎d cortisol levels in the pyramid training protocol group with Tribulus supplementation showed the greatest decrease an‎d significant difference (P=0.016). HDL levels increased in all groups (P=0.002) an‎d cholesterol decreased (P=0.001) an‎d these changes were more evident in the supplement groups, but a slight decrease was observed in triglyceride an‎d LDL levels, but it was not significant an‎d significant. Also, resistance training with supplementation caused a slight decrease in body fat percentage, but these changes were also not statistically significant. Conclusion: Pyramid loading was more effective than traditional training in improving muscle strength, an‎d the main role was played by the intensity an‎d load of training. In contrast, Tribulus supplementation was effective on hormonal responses an‎d lipid profiles, but the improvement in muscle performance was mainly due to the training structure.

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