جستجوی مقالات مرتبط با کلیدواژه « beta-alanine » در نشریات گروه « تربیت بدنی »

The aim of this study was to investigate the combined effect of beta-alanine and caffeine on karate specific performance; fatigue and blood lactate of teenage male karatekas.

40 karate teenagers with an average age of 15.26±2.05 years; Height: 175.43±5.77 cm and weight, 69.91±4.10 kg to participate in the study by the available method selected and in 4 groups of 10 subject, control (placebo), beta-alanine, caffeine and The combination of BA and CA were randomly replaced.Caffeine was consumed at a dose of 500 mg/kg body weight once and beta-alanine at a dose of 200 mg/kg body weight for 5 days in two doses. Karate specific performance was measured by using KST (Karate Specific test), anaerobic capacity was measured by RAST test. Also, the blood lactate level of the subjects was measured before taking the supplement and before and after the KST test. Data were analyzed using SPSS version 22 statistical software and analysis of two-way analysis of variance.

Data analysis showed that the karate specific performance variable had a significant improvement in all three supplement groups compared to the control group (p≤0.05). Fatigue index in the caffeine and combined groups and lactate changes were significantly reduced only in the combined group (p≤0.05).

Based on the results of this research, the combined use of beta-alanine and caffeine supplements significantly improved performance and significantly reduced fatigue and blood lactate. Therefore, it is recommended to use a combination of them in the nutritional strategies of karatekas.

The purpose of the present study was to compare the effect of creatine malate, betaine and beta-alanine supplements on the performance of boxing athletes.

First, dependent variables were measured in 15 boxing athletes and from the next day they consumed the first supplement for ten days. Then a wash-out period was considered for two weeks, after that the subjects consumed the second supplement for ten days. Another two-weeks was considered for wash-out and after that the subjects consumed the third supplement for ten days. Dependent variables were measured after the end of each supplement period. The order of taking the supplements was chosen randomly.

One maximum repetition of squat and bench press following creatine malate intake were significantly higher compared to betaine (p<0.001, p<0.005 respectively) and control (both p<0.001) and following beta-alanine intake compared to betaine (p<0.007, p<0.017 respectively) and control (p<0.005, p<0.014 respectively). The duration of agility following beta-alanine consumption was significantly lower compared to creatine malate (p<0.015), betaine (p<0.001) and control (p<0.001). The reaction speed following beta-alanine consumption was significantly higher compared to creatine malate (p<0.016), betaine (p<0.023) and control (p<0.001).

The results of this research showed that the consumption of creatine malate is more effective in improving muscle strength and the consumption of beta-alanine is more effective in improving agility and reaction speed, and the consumption of betaine does not have a significant effect on the performance of boxing athletes.

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 beta-alanine supplementation and regular Taekwondo training on anaerobic, aerobic, and endurance activity substrate metabolism in female Taekwondo athletes.

Twenty-four female professional taekwondo practitioners (age, 18.0±2.5 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) of supplement and placebo. The pre-tests consisted of the an aerobic specific test (Progressive Specific Taekwondo Test, PSTT) including repeated strikes of Bandal-Tchagui to exhaustion time during a maximum duration of 15 minutes and a taekwondo anaerobic test (Frequency Speed of Kick Te, FSKT) including 5 sets of 10-second high-speed Bandal-Tchagui kicks with maximum strength. Furthermore, the substrate metabolism of the endurance activity was measured by a gas analyzer, and the VCO2, VO2, VO2peak, HR, and HRpeak were measured. During and immediately after the test, the level of perception of fatigue was evaluated. Moreover, blood lactate levels were measured using a lactometer after the anaerobic and aerobic tests. After 28 days of receiving the supplement or placebo (5g/day) at the designated day times, the pre-test measurements were repeated. Repeated measures of ANOVA with between-group factor and Bonferroni post-hoc tests were used to compare the data.

There was no significant difference between the two supplement and placebo groups for anaerobic capacity, aerobic capacity, and substrate metabolism (p<0.05). Although, both groups (supplement and placebo) showed significant improvements in the time to exhaustion and the number of steps to exhaustion in the post-test compared to the pre-test, these improvements were significantly higher in the supplement group compared to the placebo (p<0.05).

During the research period, beta-alanine supplementation had only an effect on some performance indicators and probably more pronounced effects on the performance of elite athletes would be seen in the long term. However, this little gain can be important in professional athletes, and more studies are needed in this field for a concrete conclusion.

The main aim of this study was to determine the effect of sodium bicarbonate and beta-alanine supplementation on anaerobic capacity and blood lactate levels of female futsal players. 40 volunteer female futsal players of the Tehran League were selected based on the variables of entering the research and sampling and randomly selected four of the 40 volunteers and randomly divided into four control groups (n=10), sodium bicarbonate (n=10), beta-alanine (n=10) and sodium bicarbonate and beta-alanine (n=10) were divided. The anthropometric characteristics of their height, weight and body mass index were measured before the test. Then the Wingate test was performed to measure power and their blood lactate level was also measured using a lactometer. After each test session, the bicarbonate group received 0.3 grams of sodium bicarbonate supplement per kilogram of body weight, the beta-alanine group received 0.3 grams of beta-alanine supplement per kilogram of body weight, and the combined group also received per kilogram The combination of beta-alanine and sodium bicarbonate was used for 0.3 grams of body weight, and the control group used 0.3 grams of placebo (starch) per kilogram of body weight, and after 90 minutes, the relevant tests were performed again. Also, the subjects' diet was controlled during the test. Finally, descriptive statistics, Shapiro-Wilk test, one-way analysis of variance test and Tukey's post hoc test were used for statistical analysis of the data using spss/21 software at a significance level of p≤0.05. The results showed that the supplement of sodium bicarbonate and beta-alanine has a significant effect on the average power and blood lactate level of female futsal players. According to the results of the research, it is suggested that coaches and players use sodium bicarbonate and beta-alanine supplements to increase strength and reduce the negative effects of lactic acid.

Exercise training represents a successful and powerful strategy to prevent future cardiovascular disease. However, Studies have shown that acute exercise can increase serum concentrations of cardiac biomarkers. The aim of this study was to investigate the effects of a session wrestling match with beta-alanine supplementation on some indicators of heart damage in elite wrestlers. 16 wrestlers as subjects (two men in each weight) were selected and purposefully they were divided into control and experimental groups. Supplement group consumption 1000 mg beta-alanine for 4 hours before the protocol. The training program includes a course of the match was simulated, the wrestler held four wrestling match at intervals of half-hour. The amount of 8 ml blood samples from the brachial vein before, immediately after and one hour after the exercise program were collected. Data were analyzed with using of t test and analysis of variance with repeated measures at α<0.05. The results showed that a session of wrestling match with beta-alanine supplementation had no significant effect on troponin I and troponin T (P=0.05). a session of wrestling match with beta-alanine supplementation were significantly increased CKmb and LDH (P=0.000). It seems indicators damage the heart (cardiac troponin I and T) to follow the intense activity and beta-alanine supplementation does not change in athletes with high fitness.