| THE USE OF
VARYING CREATINE REGIMENS ON SPRINT CYCLING |
Konstantinos Havenetidis1 , Ourania Matsouka2 , Carlton Brian Cooke1
and Apostolos Theodorou1 |
1 Leeds Metropolitan University, School of
Leisure and Sports Studies, Leeds, UK
2 Democritus University of Thrace, Department
of Sports Science and P.E., Komotini, GREECE
| Received |
|
05 May 2003 |
| Accepted |
|
03 July
2003
|
| Published |
|
01 September 2003 |
©
Journal of Sports Science and Medicine (2003) 2, 88-97
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This study aimed to determine the effects of different
acute creatine loadings (ACRL) on repeated cycle sprints. Twenty-eight active
subjects divided into the control (n=7) and the experimental (n=21) group.
The exercise protocol comprised three 30s Anaerobic Wingate Tests (AWT)
interspersed with six minutes recovery, without any supplements ingested
and following placebo and creatine ingestion, according to each ACRL (40g,
100g and 135g throughout a four-day period). Blood and urinary creatine
levels were also determined from the experimental group for each ACRL. Protein
intake (across all groups) was held constant during the study. There were
no changes in protein intake or performance of the control group. For the
experimental group creatine supplementation produced significant (p<0.01)
increases in body mass (82.5 ± 1.4kg pre vs 82.9 ± 1.2kg post), blood (0.21
± 0.04mmol·l-1 pre vs 2.24 ± 0.98mmol·l-1 post), and
urinary creatine (0.23 ± 0.09mmol·l-1 pre vs 4.29 ± 1.98mmol·l-1
post). No significant differences were found between the non-supplement
and placebo condition. Creatine supplementation produced an average improvement
of 0.7%, 11.8% and 11.1% for the 40g, 100g and 135g ACRL respectively. However,
statistics revealed significant (p<0.01) differences only for the 100g
and 135g ACRL. Mean ± SD values for the 100g ACRL for mean and minimum power
were 612 ± 180W placebo vs 693 ± 221W creatine and 381 ± 35W placebo vs
415 ± 11W creatine accordingly. For the 135g ACRL the respective performance
values were 722 ± 215W placebo vs 810 ± 240W creatine and 405 ± 59W placebo
vs 436 ± 30W creatine. These data indicate that a 100g compared to 40g ACRL
produces a greater potentiation of performance whilst, greater quantities
of creatine ingestion (135g ACRL) can not provide a greater benefit.
KEY WORDS: Acute create loading, performance enhancement, dosage
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