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β-Alanine Improves Sprint Performance in Endurance Cycling
- Source :
- Medicine & Science in Sports & Exercise. 41:898-903
- Publication Year :
- 2009
- Publisher :
- Ovid Technologies (Wolters Kluwer Health), 2009.
-
Abstract
- Purpose: Recent research has shown that chronic dietary [beta]-alanine ([beta]ALA) supplementation increases muscle carnosine content, which is associated with better performance in short (1-2 min) maximal exercise. Success in endurance competitions often depends on a final sprint. However, whether [beta]ALA can be ergogenic in sprint performance at the end of an endurance competition is at present unknown. Therefore, we investigated the effect of 8-wk [beta]ALA administration in moderately to well-trained cyclists on sprint performance at the end of a simulated endurance cycling race. Methods: A double-blind study was performed, which consisted of two experimental test sessions interspersed by an 8-wk [beta]ALA (2-4 g[middle dot]d-1; n = 9) or matched placebo (PL; n = 8) supplementation period. In the pretesting and the posttesting, subjects performed a 10-min time trial and a 30-s isokinetic sprint (100 rpm) after a 110-min simulated cycling race. Capillary blood samples were collected for determination of blood lactate concentration and pH. Results: Mean power output during the time trial was approximately 300 W and was similar between PL and [beta]ALA during either the pretesting or the posttesting. However, compared with PL, during the final sprint after the time trial, [beta]ALA on average increased peak power output by 11.4% (95% confidence interval = +7.8 to +14.9%, P = 0.0001), whereas mean power output increased by 5.0% (95% confidence interval = +2.0 to +8.1%, P = 0.005). Blood lactate and pH values were similar between groups at any time. Conclusion: Oral [beta]ALA supplementation can significantly enhance sprint performance at the end of an exhaustive endurance exercise bout.
- Subjects :
- Adult
medicine.medical_specialty
Adolescent
beta-Alanine
Physical Therapy, Sports Therapy and Rehabilitation
Athletic Performance
Placebo
Young Adult
chemistry.chemical_compound
Time trial
Double-Blind Method
Endurance training
Internal medicine
medicine
Humans
Orthopedics and Sports Medicine
Lactic Acid
Beta (finance)
business.industry
Confidence interval
Bicycling
Endocrinology
Sprint
chemistry
Dietary Supplements
Physical Endurance
Physical therapy
Cycling
business
human activities
Subjects
Details
- ISSN :
- 01959131
- Volume :
- 41
- Database :
- OpenAIRE
- Journal :
- Medicine & Science in Sports & Exercise
- Accession number :
- edsair.doi.dedup.....8bb6e5c21c7ca16b2deb7090606b9a3a