Author:

Keywords:

Administration, Oral, Adult, Analysis of Variance, Creatine, Cross-Over Studies, Double-Blind Method, Female, Humans, Male, Running, Science & Technology, Life Sciences & Biomedicine, Sport Sciences, fatigue, recovery, athletics, FIBER-TYPE COMPOSITION, EXERCISE PERFORMANCE, MUSCLE METABOLISM, REPEATED BOUTS, PHOSPHOCREATINE RESYNTHESIS, SUPRAMAXIMAL EXERCISE, MEN, RESISTANCE, VELOCITY, SWIMMERS, 1106 Human Movement and Sports Sciences, 1116 Medical Physiology, 3202 Clinical sciences, 3208 Medical physiology, 4207 Sports science and exercise

Abstract:

This study examined the impact of short-term (7-day), high-dose (0.35 g.kg(-1).d(-1)) oral creatine monohydrate supplementation (CrS) on single sprint running performance (40 m, <6 seconds) and on intermittent sprint performance in highly trained sprinters. Nine subjects completed the double-blind cross-over design with 2 supplementation periods (placebo and creatine) and a 7-week wash-out period. A test protocol consisting of 40-m sprint runs was performed, and running velocity was continuously recorded over the total distance. The maximal sprint performance, the relative degree of fatigue at the end of intermittent sprint exercise (6 x 40 m, 30-second rest interval), as well as the degree of recovery (120-second passive rest) remained unchanged following CrS. There were no significant changes related to CrS in absolute running velocity at any distance between start and finish (40 m). It was concluded that no ergogenic effect on single or repeated 40-m sprint times with varying rest periods was observed in highly trained athletes.