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Effects of dietary leucine supplementation on exercise performance.

Abstract

Branched chain amino acids (BCAA), particularly leucine, have been suggested to be ergogenic for both endurance and strength/power performance. This study investigated the effects of dietary leucine supplementation on the exercise performance of outrigger canoeists. Thirteen (ten female, three male) competitive outrigger canoeists [aged 31.6 (2.2) year, VO(2max) 47.1 (2.0) ml kg(-1) min(-1)] underwent testing before and after 6-week supplementation with either capsulated L: -leucine (45 mg kg(-1) d(-1); n = 6) or placebo (cornflour; n = 7). Testing included anthropometry, 10 s upper body power and work and a row to exhaustion at 70-75% maximal aerobic power where perceived exertion (RPE), heart rate (HR) and plasma BCAA and tryptophan concentrations were assessed. Leucine supplementation resulted in significant increases in plasma leucine and total BCAA concentrations. Upper body power and work significantly increased in both groups after supplementation but power was significantly greater after leucine supplementation compared to the placebo [6.7 (0.7) v. 6.0 (0.7) W kg(-1)]. Rowing time significantly increased [77.6 (6.3)-88.3 (7.3) min] and average RPE significantly decreased [14.5 (1.5)-12.9 (1.4)] with leucine supplementation while these variables were unchanged with the placebo. Leucine supplementation had no effect on the plasma tryptophan to BCAA ratio, HR or anthropometric variables. Six weeks' dietary leucine supplementation significantly improved endurance performance and upper body power in outrigger canoeists without significant change in the plasma ratio of tryptophan to BCAA.

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  • Authors+Show Affiliations

    ,

    Institute of Sport and Exercise Science, James Cook University, Townsville, QLD 4811, Australia. Melissa.Crowe@jcu.edu.au

    ,

    Source

    MeSH

    Adult
    Amino Acids
    Amino Acids, Branched-Chain
    Body Composition
    Body Weight
    Dietary Proteins
    Dietary Supplements
    Double-Blind Method
    Exercise
    Exercise Test
    Female
    Heart Rate
    Humans
    Leucine
    Male
    Oxygen Consumption
    Physical Endurance
    Physical Exertion
    Tryptophan

    Pub Type(s)

    Journal Article
    Randomized Controlled Trial

    Language

    eng

    PubMed ID

    16265600

    Citation

    Crowe, Melissa J., et al. "Effects of Dietary Leucine Supplementation On Exercise Performance." European Journal of Applied Physiology, vol. 97, no. 6, 2006, pp. 664-72.
    Crowe MJ, Weatherson JN, Bowden BF. Effects of dietary leucine supplementation on exercise performance. Eur J Appl Physiol. 2006;97(6):664-72.
    Crowe, M. J., Weatherson, J. N., & Bowden, B. F. (2006). Effects of dietary leucine supplementation on exercise performance. European Journal of Applied Physiology, 97(6), pp. 664-72.
    Crowe MJ, Weatherson JN, Bowden BF. Effects of Dietary Leucine Supplementation On Exercise Performance. Eur J Appl Physiol. 2006;97(6):664-72. PubMed PMID: 16265600.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Effects of dietary leucine supplementation on exercise performance. AU - Crowe,Melissa J, AU - Weatherson,Jarrad N, AU - Bowden,Bruce F, Y1 - 2005/10/29/ PY - 2005/07/06/accepted PY - 2005/11/3/pubmed PY - 2006/10/6/medline PY - 2005/11/3/entrez SP - 664 EP - 72 JF - European journal of applied physiology JO - Eur. J. Appl. Physiol. VL - 97 IS - 6 N2 - Branched chain amino acids (BCAA), particularly leucine, have been suggested to be ergogenic for both endurance and strength/power performance. This study investigated the effects of dietary leucine supplementation on the exercise performance of outrigger canoeists. Thirteen (ten female, three male) competitive outrigger canoeists [aged 31.6 (2.2) year, VO(2max) 47.1 (2.0) ml kg(-1) min(-1)] underwent testing before and after 6-week supplementation with either capsulated L: -leucine (45 mg kg(-1) d(-1); n = 6) or placebo (cornflour; n = 7). Testing included anthropometry, 10 s upper body power and work and a row to exhaustion at 70-75% maximal aerobic power where perceived exertion (RPE), heart rate (HR) and plasma BCAA and tryptophan concentrations were assessed. Leucine supplementation resulted in significant increases in plasma leucine and total BCAA concentrations. Upper body power and work significantly increased in both groups after supplementation but power was significantly greater after leucine supplementation compared to the placebo [6.7 (0.7) v. 6.0 (0.7) W kg(-1)]. Rowing time significantly increased [77.6 (6.3)-88.3 (7.3) min] and average RPE significantly decreased [14.5 (1.5)-12.9 (1.4)] with leucine supplementation while these variables were unchanged with the placebo. Leucine supplementation had no effect on the plasma tryptophan to BCAA ratio, HR or anthropometric variables. Six weeks' dietary leucine supplementation significantly improved endurance performance and upper body power in outrigger canoeists without significant change in the plasma ratio of tryptophan to BCAA. SN - 1439-6319 UR - https://www.unboundmedicine.com/medline/citation/16265600/Effects_of_dietary_leucine_supplementation_on_exercise_performance_ L2 - https://dx.doi.org/10.1007/s00421-005-0036-1 DB - PRIME DP - Unbound Medicine ER -