caa a22 4500 467941718 CHVBK 20180406153014.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s00421-005-0036-1 doi (NATIONALLICENCE)springer-10.1007/s00421-005-0036-1 Effects of dietary leucine supplementation on exercise performance [Elektronische Daten] [Melissa Crowe, Jarrad Weatherson, Bruce Bowden] 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, VO2max 47.1 (2.0)mlkg−1min−1] underwent testing before and after 6-week supplementation with either capsulated L-leucine (45mgkg−1d−1; n=6) or placebo (cornflour; n=7). Testing included anthropometry, 10s 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) Wkg−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. Springer-Verlag, 2005 Branched-chain amino acids nationallicence Central fatigue nationallicence Supplements nationallicence Tryptophan nationallicence Crowe Melissa Institute of Sport and Exercise Science, James Cook University, 4811, Townsville, QLD, Australia aut Weatherson Jarrad Institute of Sport and Exercise Science, James Cook University, 4811, Townsville, QLD, Australia aut Bowden Bruce School of Pharmacy and Molecular Sciences, James Cook University, 4811, Townsville, QLD, Australia aut European Journal of Applied Physiology Springer-Verlag 97/6(2006-08-01), 664-672 1439-6319 97:6<664 2006 97 421 https://doi.org/10.1007/s00421-005-0036-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-005-0036-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Crowe Melissa Institute of Sport and Exercise Science, James Cook University, 4811, Townsville, QLD, Australia aut NATIONALLICENCE 700 1- Weatherson Jarrad Institute of Sport and Exercise Science, James Cook University, 4811, Townsville, QLD, Australia aut NATIONALLICENCE 700 1- Bowden Bruce School of Pharmacy and Molecular Sciences, James Cook University, 4811, Townsville, QLD, Australia aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/6(2006-08-01), 664-672 1439-6319 97:6<664 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer