Creatine Supplementation

23 continuous endurance much of the previous cr

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Unformatted text preview: s Endurance Much of the previous Cr literature has focused on improvements in anaerobic and intermittent physical activity. In terms of sport performance, there is less evidence to support the use of Cr with activities Sports Med 2005; 35 (2) 120 that are longer in duration than 3 minutes. The potential positive ergogenic effects that Cr might have on submaximal endurance performance have been addressed in only a few papers since the year 2000. Jones et al.[52] investigated the effects of Cr ˙ loading on oxygen uptake (VO2) kinetics during submaximal cycle exercise. Five subjects received Cr (20 g/day for 5 days followed by 5 g/day maintenance dose) while four subjects served as controls. Following all testing conditions, 35–50 days later, the five subjects initially supplemented with Cr now served as controls and the initial four control subjects were now supplemented with Cr. Paired t-tests revealed that there were no significant differences ˙ between groups for the VO2 kinetic response during the moderate exercise protocol and that Cr had no ergogenic effect. The limitations of this study involve the statistical analyses and the small sample size. However, similar results were obtained by Syrotuik et al.[53] when they examined the effect of Cr supplementation (0.3 g/kg BW/day, ingested in four equal portions throughout the day, for 5 days, then a maintenance phase of 0.03 g/kg BW/day for 5 weeks) on training volume for male rowers. The initial 5-day loading period of Cr did not improve repeated interval rowing performance, 2000m rowing times or any strength measures. Following an additional 5 weeks of Cr supplementation, still no differences were noted between the two groups relative to any of the performance parameters. In contrast to these two previous studies, RicoSanz and Marco[54] investigated the effects of Cr ˙ supplementation on VO2 and performance during alternating bouts of exercise at different intensities. Fourteen male subjects were randomly assigned to either a Cr group (n = 7; 20 g/day for 5 days) or a placebo group (n = 7). Cycling...
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