Title

L-alanyl-L-glutamine ingestion maintains performance during a competitive basketball game

Authors

Authors

J. R. Hoffman; D. R. Williams; N. S. Emerson; M. W. Hoffman; A. J. Wells; D. M. McVeigh; W. P. McCormack; G. T. Mangine; A. M. Gonzalez;M. S. Fragala

Comments

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Abbreviated Journal Title

J. Int. Soc. Sport Nutr.

Keywords

Supplement; Dehydration; Hypohydration; Exercise; Reaction Time; WATER-ABSORPTION; ORAL REHYDRATION; CHOLERA-TOXIN; RAT MODEL; DEHYDRATION; DIARRHEA; PLAYERS; HYPOHYDRATION; ANTICIPATION; ELECTROLYTE; Nutrition & Dietetics; Sport Sciences

Abstract

Background: The purpose of this study was to examine the efficacy of L-alanyl-L-glutamine (AG) ingestion on basketball performance, including jump power, reaction time, shooting accuracy and fatigue. Methods: Ten women (21.2 +/- 1.6 years; height: 177.8 +/- 8.7 cm; body mass: 73.5 +/- 8.0 kg), all scholarship NCAA Division I basketball players, volunteered for this study. Subjects participated in four trials, each consisting of a 40-min basketball game with controlled time-outs for rehydration. During the first trial (DHY) subjects were not allowed to rehydrate, and the total weight lost during the contest was used to determine fluid replenishment during the subsequent three trials. During one trial subjects consumed only water (W), while during the other two trials subjects consumed the AG supplement mixed in water using either a low dose (1 g per 500 ml) (AG1) or high dose (2 g per 500 ml) (AG2) concentration. All data assessed prior to and following each game were converted into a Delta score (Post results - Pre results). All performance data were then analyzed using a one-way repeated measures analysis of variance. Results: During DHY subjects lost 1.72 +/- 0.42 kg (2.3%) of their body mass. No differences in fluid intake (1.55 +/- 0.43 L) were seen between rehydration trials. A 12.5% (p = 0.016) difference in basketball shooting performance was noted between DHY and AG1 and an 11.1% (p = 0.029) difference was seen between AG1 and W. Visual reaction time was significantly greater following AG1 (p = 0.014) compared to DHY. Differences (p = 0.045) in fatigue, as determined by player loads, were seen only between AG2 and DHY. No differences were seen in peak or mean vertical jump power during any trial. Conclusion: Rehydration with AG appears to maintain basketball skill performance and visual reaction time to a greater extent than water only.

Journal Title

Journal of the International Society of Sports Nutrition

Volume

9

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

8

WOS Identifier

WOS:000302185200001

ISSN

1550-2783

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