The Effect of beta-Alanine Supplementation on Power

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The Effect of beta-Alanine Supplementation on Power

Postby cleaver on Tue Dec 01, 2009 10:25 pm

J Strength Cond Res. 2009 Nov 20. [Epub ahead of print]
The Effect of beta-Alanine Supplementation on Power Performance During Repeated Sprint Activity.

Sweeney KM, Wright GA, Brice AG, Doberstein ST.

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

Sweeney, KM, Wright, GA, Brice, AG, and Doberstein, ST. The effect of beta-alanine supplementation on power performance during repeated sprint activity. J Strength Cond Res 24(x): 000-000, 2009-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 beta-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.


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Re: The Effect of beta-Alanine Supplementation on Power

Postby Dtlv74 on Wed Dec 02, 2009 4:15 am

The very short duration all out sprinting in the study may actually be at too high a VO2 max for the buffering effect to make any significant difference - BA is most effective due it's buffering of lactate, but at very high VO2 max effort the energy demand shifts away from lactate to mostly ATP use, with the energy contribution from lactate actually pretty small over the initial few seconds.

It says they did "5 5-second sprints with 45-second recovery separated by 2 minutes of active recovery" - I'd hypothesise that if they instead had tested 5 30 second sprints (which would necessitate a greater lactate contribution to energy) that BA would then show a more positive result.
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Re: The Effect of beta-Alanine Supplementation on Power

Postby kp1512 on Wed Dec 02, 2009 9:34 am

BA is more around getting more reps,longer duration and increased time for fatigue during "work"

I cant help but think this study was a choc teapot to prove anything

Agree with Det - way longer activity was required
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