نوع مقاله : علمی - پژوهشی
نویسندگان
1 دانشجوی دکتری فیزیولوژی ورزش، گروه فیزیولوژی ورزش، دانشکده علوم ورزشی، دانشگاه خوارزمی، تهران، ایران
2 گروه فیزیولوژی ورزش، دانشکده تربیت بدنی وعلوم ورزشی، دانشگاه خوارزمی، تهران، ایران
3 گروه فیزیولوژی ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Purpose: Beta-alanine supplement, which is a precursor of carnosine, may improve performance by providing a buffering effect. The purpose of this study was to investigate the effect of a beta-alanine supplementation course and regular Taekwondo training on anaerobic, aerobic, and endurance activity substrate metabolism in female Taekwondo athletes.
Methods: Twenty-four female professional taekwondo practitioners, (age 18.0±2.50 years), from Tehran province volunteered to participate in this research. Based on the body composition and training history, the subjects were divided into two groups (n=12): supplement and placebo groups.3 hours after eating the standard breakfast determined based on the weight of each player, they started to perform 15 minute standardized warm-up protocol at a medium speed that consisted of 2 sets of 20 alternating front kicks (Ap-Tchagui) and 3 sets of 20 alternating Bandal-Tchagui. The pre-tests consisted of the Aerobic Specific Test (PSTT) including repeated strikes of Bandal-Tchagui to exhaustion time during a maximum duration of 15 minutes and the Taekwondo Anaerobic Test (FSKT) including 5 sets of 10-second high-speed Bandal-Tchagui kicks with maximum strength was performed. Also, the metabolism of the endurance activity substrate was measured by a gas analyzer, and the VCO2, VO2, VO2 Peak, HR, and HR Peak were evaluated. During and immediately after the test, the level of perception of fatigue was evaluated. Also, blood lactate level was measured using a lactometer after the anaerobic and aerobic tests. After 28 days of receiving the supplement or placebo (5g/day) at the designated hours, the relevant tests were re-evaluated. Repeated ANOVA tests with between-group factor and Bonferroni post hoc test were used to compare the groups’ results.
Results: There was no significant difference between the two supplement and placebo groups in the indicators of anaerobic, aerobic, and substrate metabolism (p<0.05). However, both groups (supplement and placebo) showed a significant improvement in the time to exhaustion and the number of steps to exhaustion in the post-test compared to the pre-test, but this improvement was significant in the supplement group compared to the control. (p<0.05).
Discussion: During the research period, beta-alanine supplementation only had an obvious effect on some performance indicators and probably have more obvious effects on the performance of elite athletes in the long term. However, this little gain can be important in professional athletes, in any case, more studies are needed in this field for a definitive conclusion.
Keywords: Respiratory exchange, taekwondo-specific anaerobic test, taekwondo-specific aerobic test, beta-alanine, fat oxidation, carbohydrate oxidation, metabolism
کلیدواژه‌ها [English]
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