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EFFECTS OF TWENTY-EIGHT DAYS OF BETA-ALANINE AND CREATINE MONOHYDRATE SUPPLEMENTATION ON THE PHYSICAL WORKING CAPACITY AT NEUROMUSCULAR FATIGUE THRESHOLD.
- Source :
-
Journal of Strength & Conditioning Research . Nov2006, Vol. 20 Issue 4, p928-931. 4p. - Publication Year :
- 2006
-
Abstract
- The purpose of this study was to examine the effects of 28 days of beta-alanine (b-Ala) and creatine monohydrate (CrM) supplementation on the onset of neuromuscular fatigue by using the physical working capacity at neuromuscular fatigue threshold (PWCFT) test in untrained men. Fifty-one men (mean age ± SD = 24.5 ± 5.3 years) volunteered to participate in this 28-day, double-blind, placebo-controlled study and were randomly assigned to 1 of 4 groups: placebo (PLA; 34 g dextrose; n = 13), CrM (5.25 g CrM plus 34 g dextrose; n = 12), b-Ala (1.6 g b-Ala plus 34 g of dextrose; n = 12), or b-Ala plus CrM (CrBA; 5.25 g CrM plus 1.6 g b-Ala plus 34 g dextrose; n = 14). The supplement was ingested 4 times per day for 6 consecutive days, then twice per day for 22 days before posttesting. Before and after the supplementation, subjects performed a continuous incremental cycle ergometry test while a surface electromyographic signal was recorded from the vastus lateralis muscle to determine PWCFT. The adjusted mean posttest PWCFT values (covaried for pretest PWCFT values) for the b-Ala and CrBA groups were greater than those for the PLA group (p ≤ 0.05). However, there were no differences between the CrM vs. PLA, CrBA vs. b-Ala, CrM vs. b-Ala, or CrM vs. CrBA groups (p > 0.05). These findings suggested that b-Ala supplementation may delay the onset of neuromuscular fatigue. Furthermore, there appeared to be no additive or unique effects of CrM vs. b-Ala alone on PWCFT. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10648011
- Volume :
- 20
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Strength & Conditioning Research
- Publication Type :
- Academic Journal
- Accession number :
- 113579466
- Full Text :
- https://doi.org/10.1519/r-19655.1