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The Effect of -Alanine Supplementation on Power Performance During Repeated Sprint Activity

Sweeney, Kaitlin M1; Wright, Glenn A1; Glenn Brice, A2; Doberstein, Scott T1

Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e3181c63bd5
Original Research
Abstract

Sweeney, KM, Wright, GA, Brice, AG, and Doberstein, ST. The effect of β-alanine supplementation on power performance during repeated sprint activity. J Strength Cond Res 24(1): 79-87, 2010-The dipeptide carnosine has been shown to contribute to the buffer capacity of hydrogen ions (H+) during intense exercise. Increasing skeletal muscle carnosine levels through β-alanine (BA) supplementation has been shown to maintain acid-base balance, delay fatigue, and improve exercise performance. We designed this study to examine the effect of 5 weeks of BA supplementation on repeat high-intensity sprint performance. Nineteen, physically active, college men were divided into 2 groups (control [C], n = 10 or BA, n = 9). We performed double-blind placebo-controlled study where subjects ingested 4 g per day during the first week and 6 g per day over the next 4 weeks of a placebo (rice flour) or a BA supplement. Subjects completed 2 sets of 5 5-second sprints with 45-second recovery separated by 2 minutes of active recovery. All tests were conducted on a non-motorized treadmill against a resistance of 15% of the participant's body weight. We recorded horizontal power (HP) of the running sprint. Post-exercise capillary blood samples were analyzed for lactate to determine the metabolic demands. There were no significant between-group differences (p > 0.05) in HPpeak or HPmean for the repeat sprint protocol. No significant between-group differences were found for performance decrement (% fatigue) for HPpeak or HPmean. In addition, no significant interactions were observed. Post-exercise blood lactate values were similar pre and post supplementation in both groups. The results of this study clearly indicate that 5 weeks of BA supplementation provides no benefit for repeat sprint performance.

Author Information

1Exercise and Sport Science Department; and 2Biology Department, University of Wisconsin-La Crosse, La Crosse, Wisconsin

Human Performance Laboratory, University of Wisconsin-La Crosse.

Address correspondence to Kaitlin M. Sweeney, kaitlin.sweeney@gmail.com.

© 2010 National Strength and Conditioning Association