| Autor: |
GILL, NICHOLAS D., HALL, ROWAN D., BLAZEVICH, ANTHONY J. |
| Zdroj: |
Journal of Strength & Conditioning Research; May2004, Vol. 18 Issue 2, p272-275, 4p |
| Abstrakt: |
This study examined the effects of supplementation with either creatine monohydrate powder in solution (CP) or a widely available creatine serum (CS) on performance in a repeated maximal sprint cycling test (10 X 6 seconds, 24-second passive rest between sprints). Using a randomized, double-blind, crossover design, 11 competitive male athletes supplemented with creatine in 2 forms according to the manufacturer's recommendations on 2 separate occasions. The 2 supplementation protocols were (a) 20 g-day-1 X 6 days of creatine powder in solution plus a placebo serum (CP) or (b) 5 ml-day-1 X 6 days of creatine serum plus a placebo powder (CS). Subjects completed 2 familiarization trials before the 6-day supplementation period. A repeated maximal sprint cycling test was performed prior to and immediately postsupplementation. A 7-week washout period separated the 2 supplementation protocols. Subjects' total work (9.6%) and peak power (3.4%) in the cycle sprint improved significantly (p < 0.05) after loading with CP, but there was little change after loading with CS. The present data support previous research findings showing an ergo-genic effect of CP supplementation but indicate that supplementation with CS does not affect sprint cycling performance. Although the levels of creatine in each formulation were not determined, a substantial conversion of creatine into creatinine has been reported in many formulations and may explain the present findings. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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