Effect of Branched-Chain Amino Acid Supplementation on O2 Uptake Kinetics and Time to Exhaustion in Trained Women
Objective The aim of this study was to investigate the effect of Branched-Chain Amino Acid (BCAA) supplementation on O2 uptake kinetics and the time to exhaustion in trained women. Methods In this quasi-experimental study with pre-test/post-test design, participants were 20 trained women (Mean±SD a...
| Main Authors: | , , |
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| Format: | Article |
| Language: | fas |
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Arak University of Medical Sciences
2019-11-01
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| Series: | Complementary Medicine Journal of Faculty of Nursing and Midwifery |
| Subjects: | |
| Online Access: | http://cmja.arakmu.ac.ir/article-1-629-en.html |
| Summary: | Objective The aim of this study was to investigate the effect of Branched-Chain Amino Acid (BCAA) supplementation on O2 uptake kinetics and the time to exhaustion in trained women.
Methods In this quasi-experimental study with pre-test/post-test design, participants were 20 trained women (Mean±SD age, 21.3±0.5 years). They were randomly assigned into two groups of BCAA (received 45mg/kg/d BCAA for 7 days; n=10) and isocaloric placebo (received 2g/d microcrystalline cellulose for 7 days; n=10). On day 7, subjects performed the incremental exercise test on a cycle ergometer until exhaustion in order to measure maximal oxygen uptake (Vo2max). Respiratory gas exchange was measured using breath-by-breath analysis in order to evaluate O2 uptake kinetics. Data were analyzed using one-way ANOVA with repeated measures at the significance level of P<0.05.
Results BCAA supplementation significantly increased Vo2max (P<0.04, 1.5±0.8 vs 1.9±0.5 min) and the time to exhaustion (P<0.02, 13.5±3.1 vs. 16.6±2.1 min) during the exercise test. The O2 uptake kinetics such as oxygen deficit (P<0.01), time constant 1(P<0.02) and time constant 2 (P<0.01) in the BCAA group were faster than those in the placebo group.
Conclusion BCAA supplementation (45mg/kg/d) can speed up the O2 uptake kinetics and may be effective in increasing the endurance capacity. |
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| ISSN: | 2228-7094 2228-7094 |