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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 and Conditioning Research. Nov, 2006, Vol. 20 Issue 4, p928, 4 p.
- 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 ([PWC.sub.FT]) test in untrained men. Fifty-one men (mean age [+ or -] SD = 24.5 [+ or -] 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 [PWC.sub.FT]. The adjusted mean posttest [PWC.sub.FT] values (covaried for pretest [PWC.sub.FT] values) for the b-Ala and CrBA groups were greater than those for the PLA group (p [less than or equal to] 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 [PWC.sub.FT] KEY WORDS. carnosine, ergogenic aids, electromyography, cycle ergometry
Details
- Language :
- English
- ISSN :
- 10648011
- Volume :
- 20
- Issue :
- 4
- Database :
- Gale General OneFile
- Journal :
- Journal of Strength and Conditioning Research
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.155750123