مقايسه اثر تمرينات پلايومتريك با و بدون مكمل‌گيري بتا آلانين روي سطوح لاكتات، هورمون كورتيزول و برخي متغيرهاي فيزيولوژيكي دختران تكواندو‌كار

Comparison of the impact of plyometric training, both with an‎d without beta-alanine supplementation, on lactate levels, cortisol hormone, an‎d various physiological parameters in female taekwondo athletes

فيزيولوژي ورزش

Background an‎d Purpose: Plyometric training is recognized as an effective method for enhancing explosive power an‎d athletic performance. Additionally, beta-alanine supplementation has attracted interest for its potential to reduce fatigue an‎d improve lactic acid tolerance. The purpose of this study is to examine an‎d compare the effects of plyometric training combined with beta-alanine supplementation on blood lactate levels, cortisol hormone, an‎d selec‎ted physiological indicators in female taekwondo athletes in Kashan. Materials an‎d Methods: This semi-experimental study was conducted using a pre-test–post-test design in a field-based setting. Thirty-two female taekwondo athletes were ran‎domly assigned to four groups: 1) regular taekwondo training with placebo (n = 8), 2) plyometric training with beta-alanine supplementation (n = 8), 3) regular taekwondo training with beta-alanine supplementation (n = 8), an‎d 4) plyometric training with beta-alanine supplementation (n = 8). The intervention period lasted eight weeks, with participants undergoing three sessions per week involving both exercise protocols an‎d supplement intake. To assess serum lactate an‎d cortisol levels, blood samples were collected using ELISA cortisol kits. Aerobic capacity was measured using the 20-meter shuttle run an‎d the sport-specific TAAA test. Body fat percentage was assessed with calipers. Anaerobic power was eva‎luated via the RAST an‎d sport-specific TAIKT tests. Agility was measured through the Illinois agility test an‎d the six-direction sport-specific agility test. Flexibility was tested using the sit-an‎d-reach method, an‎d trunk strength was assessed using an isokinetic han‎d dynamometer. To analyze changes in mean values across groups, ANCOVA statistical testing was applied. Throughout the study, the level of statistical significance was set at α = 0.05 with a 95% confidence level. Results: The results indicated that plyometric training combined with beta-alanine supplementation had a statistically significant effect on blood lactate levels, trunk strength, an‎d agility in female taekwondo athletes (p = 0.001). However, no significant changes were observed in the other measured variables (p = 1.000) Conclusion: The findings of this study demonstrate that plyometric training combined with beta-alanine supplementation can have a significant an‎d positive impact on certain physical fitness indicators, such as agility an‎d trunk strength, in female taekwondo athletes. In contrast, no significant changes were observed in indicators such as body fat percentage, aerobic an‎d anaerobic power, cortisol levels, an‎d flexibility. Interpretation of the results, based on reputable scientific sources, supports these distinctions an‎d suggests that the effectiveness of such interventions depends on the type of performance indicator, the duration an‎d intensity of training, as well as nutritional an‎d individual factors..

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