The effect of oral creatine monohydrate supplementation on running velocity.
Creatine supplementation has been shown to augment muscle PCr content and increase the rate of ATP resynthesis. Thus, we hypothesized that creatine supplementation might enhance sprinting performance. Eighteen subjects completed both of two testing sessions (control and postsupplement) 1 week apart, wherein they sprinted three 60-m distance trials that were recorded with videotape. Following the control session, for 7 days, subjects in the treatment group ingested a creatine-glucose mixture, while the placebo group consumed a glucose powder, followed by the postsupplementation session. Velocities of the subjects through three testing zones within the 60-m sprint were calculated from the videotape. Resultant velocities were analyzed using a MANOVA with a 2 x 2 x 3 x 3 (Group x Session x Trial x Zone) design. Results indicated that there were no statistically significant main or interaction effects on velocity between groups for session, trial, or zone. These data do not support the hypothesis that supplementary creatine ingestion will enhance velocity during the early or latter segments of a 60-m sprint.
Redondo
D R
DR
Department of Exercise Science, Physical Education, and Recreation, Old Dominion University, Norfolk, VA 23529-0196, USA.
Dowling
E A
EA
Graham
B L
BL
Almada
A L
AL
Williams
M H
MH
D000328:Adult; D003401:Creatine / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005947:Glucose / Q000008:administration & dosage; D006801:Humans; D008297:Male; D010725:Phosphocreatine / Q000378:metabolism; D010807:Physical Endurance / Q000187:drug effects; D012420:Running / Q000502:physiology*; D013997:Time Factors; D014743:Videotape Recording
D010725:Phosphocreatine; D005947:Glucose; D003401:Creatine