Format

Send to

Choose Destination
See comment in PubMed Commons below
Int J Sports Med. 1999 Jul;20(5):309-14.

Effects of branched-chain amino acids and carbohydrate on fatigue during intermittent, high-intensity running.

Author information

1
Department of Exercise Science, School of Public Health, University of South Carolina, Columbia 29208, USA. mdavis@sph.sc.edu

Abstract

Experimental support for the hypothesized benefits of BCAA supplements on endurance performance is limited. However, it is theorized that the benefits may be enhanced if 1) BCAA are taken along with a pre-event carbohydrate meal as well as during exercise, and 2) the exercise is intermittent in nature. This study tested the effects of ingesting carbohydrate beverages with and without BCAA before and during intermittent high-intensity running to fatigue. Eight subjects performed 3 exercise trials consisting of intermittent shuttle running (walking, sprinting, and running) to fatigue. Subjects drank either carbohydrate drinks given 1 h before (5 mL/kg, 18% carbohydrate) and during exercise (2 mL/kg, 6% carbohydrate) (CHO), carbohydrate drinks with BCAA (7 g) added to the portions consumed 1 h before and immediately before exercise (CHO+BCAA), or flavored water placebos (P). Subjects ran longer when fed either CHO or CHO+BCAA as compared to P, with no differences between CHO and CHO+BCAA. CHO and CHO+BCAA also had higher plasma glucose and insulin, and lower FFA (p < 0.05). These findings confirm a beneficial effect of carbohydrate feedings on fatigue during exercise designed to mimic the activity pattern that occurs in sports like soccer, basketball, and hockey. They do not, however, support the hypothesis of an added benefit of BCAA supplements.

PMID:
10452228
DOI:
10.1055/s-2007-971136
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Georg Thieme Verlag Stuttgart, New York
    Loading ...
    Support Center