Effects of squat exercise and branched-chain amino acid supplementation on plasma free amino acid concentrations in young women.
The present study was conducted to examine alterations in plasma free amino acid concentrations induced by squat exercise and branched-chain amino acid (BCAA) supplementation in young, untrained female subjects. In the morning on the exercise session day, participants ingested drinks containing either BCAA (isoleucine:leucine:valine=1:2.3:1.2) or dextrin (placebo) at 0.1 g/kg body weight 15 min before a squat exercise session, which consisted of 7 sets of 20 squats, with 3 min intervals between sets. In the placebo trial, plasma BCAA concentrations were decreased subsequent to exercise, whereas they were significantly increased in the BCAA trial until 2 h after exercise. Marked changes in other free amino acids in response to squat exercise and BCAA supplementation were observed. In particular, plasma concentrations of methionine and aromatic amino acids were temporarily decreased in the BCAA trial, being significantly lower than those in the placebo trial. These results suggest that BCAA intake before exercise affects methionine and aromatic amino acid metabolism.
Shimomura
Yoshiharu
Y
Laboratory of Nutritional Biochemistry, Department of Applied Molecular Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Japan. shimo@agr.nagoya-u.ac.jp
Kobayashi
Hisamine
H
Mawatari
Kazunori
K
Akita
Keiichi
K
Inaguma
Asami
A
Watanabe
Satoko
S
Bajotto
Gustavo
G
Sato
Juichi
J
D000328:Adult; D000596:Amino Acids / Q000097:blood*; D024322:Amino Acids, Aromatic / Q000097:blood; D000597:Amino Acids, Branched-Chain / Q000008:administration & dosage*; D001628:Beverages; D019587:Dietary Supplements; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008715:Methionine / Q000097:blood; D010919:Placebos
D000596:Amino Acids; D024322:Amino Acids, Aromatic; D000597:Amino Acids, Branched-Chain; D010919:Placebos; D008715:Methionine