The acute effects different quantities of branched-chain amino acids have on recovery of muscle function

Dorrell, Harry and Gee, Thomas (2016) The acute effects different quantities of branched-chain amino acids have on recovery of muscle function. Sports Nutrition and Therapy, 1 (3). e115-e115. ISSN 2473-6449

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The purpose of the study was to investigate the acute effects of two different quantities of branched-chain amino
acids (BCAA) on the recovery of muscle function following high-intensity resistance training in trained individuals.
Five resistance-trained males were recruited and performed baseline assessments of, countermovement (CMJ) and
squat jump (SJ), peak (PP) and mean (MP) power (6s Cycle Sprint) and perceived muscle soreness (RMS). In a
counterbalanced, single-blind fashion, participants were provided with either, placebo or 6 g or 18 g BCAA 20 min
prior to, and immediately after completion of a high-intensity strength session (ST). At 24 h post ST, all assessments
were completed under all three experimental conditions. Following ST, there were significant decrements in all
measures of muscle function across conditions when compared to baseline values (P<0.05). However, ingestion
of 6 g and 18 g BCAA was shown to significantly attenuate these decrements in comparison to placebo (P<0.05).
A dose-response for BCAA was also present as significant differences (P<0.05) were shown between ingestion of
6 g and 18 g; CMJ (18 g: 59.1 cm, 6 g: 57.7 cm, placebo: 56.6 cm), SJ (18 g: 54.0 cm, 6 g: 52.8 cm, placebo: 51.7
cm), PP (18 g: 1133 W, 6 g: 1107 W, placebo: 1044 W), MP (18 g: 1011 W, 6 g: 986 W, placebo: 972 W), soreness
(18 g: 81 mm, 6 g: 91 mm, placebo: 100 mm). BCAA ingested acutely before, and immediately following intensive
resistance training attenuates the decrement observed in muscle function, while alleviating symptoms of muscle
soreness. These small but significant findings support the proposed ergogenic benefits of BCAA supplementation,
but also highlight a potential dose-response, with a higher dose (18 g) having a significantly greater effect than a
lower dose (6 g) in trained individuals.

Additional Information:This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Keywords:Amino Acid, Recovery, Strength Training, Muscle Function, JCOpen
Subjects:C Biological Sciences > C600 Sports Science
Divisions:College of Social Science > School of Sport and Exercise Science
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ID Code:25871
Deposited On:25 Jan 2017 16:05

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