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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
The Journal of Sports Medicine and Physical Fitness 1999 Settembre;39(3):189-96
Oral creatine supplementation improves multiple sprint performance in elite ice-hockey players
Jones A. M., Atter T., Georg K. P.
Department of Exercise and Sport Science, Crewe and Alsager Faculty, the Manchester Metropolitan University, Hassal Road, Alsager, UK
Background. The purpose of this study was to assess the effect of oral creatine monohydrate supplementation on multiple sprint cycle and skating performance in ice-hockey players.
Methods. Participants: sixteen elite ice-hockey players were selected as subjects. Experimental design: subjects were randomly assigned to either a creatine (Cr) (n=8) or a placebo (P) group (n=8) in a double blind design. After familiarisation and baseline tests, subjects loaded with 5 g of creatine monohydrate or placebo (glucose) four times per day for 5 days, after which a maintenance dose of 5 g per day for 10 weeks was administered. At baseline, and after 10 days and 10 weeks of supplementation, subjects performed i) a cycle test involving 5 all-out sprints of 15 sec duration separated by 15 sec recovery with the resistance set at 0.075 body mass (kg), and ii) 6 timed 80-m skating sprints with the sprints initiated every 30 sec and a split time taken at 47 m.
Results. A two-way ANOVA demonstrated no significant change in any of the variables in the P group over the period of study. However, in the Cr group, average mean power output over the 5 sprints was significantly higher at 10 days (1074±241 W) and 10 weeks (1025±216 W) than at baseline (890±172 W), (p<0.01). Average peak power output over the 5 sprints improved significantly from baseline (1294±311 W) to 10 days (1572±463 W), (p<0.01). Average on-ice sprint performance to 47 m was significantly faster at 10 days (6.88±0.21 sec) and 10 weeks (6.96±0.19 sec) than at baseline (7.17±0.27 sec), (p<0.005).
Conclusions. This study demonstrates that creatine supplementation has an ergogenic effect in elite ice-hockey players.