Creatine Supplementation

3 gkg bw for the first 5 days followed by a

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Unformatted text preview: followed by a maintenance dose of 0.07 g/kg BW. Isokinetic assessment consisted of knee extensions at a velocity of 60 degrees/second for three sets of ten repetitions with 1-minute rest between sets. A 2 × 3 repeated measures ANOVA determined a significant group by time interaction for average isokinetic knee extension and flexion power, with the Cr group demonstrating significantly greater increases. These findings are in contrast to other studies that showed no positive Cr effects on performance using isokinetic actions at higher velocities (180 degrees/second). The different findings may be explained by the greater duration of the current study[29] (36 total training sessions), which may have provided a greater time course for Cr uptake in this older population. 2.1.3 Isometric Maximal Force and Rate of Force Development The effects of acute Cr supplementation on maximal voluntary force production (MVC), has been addressed in several articles. A MVC is typically defined as an angle-specific maximal isometric contraction. Jakobi et al.[39] recruited 12 older men (aged 65–82 years) who were randomly assigned to either a Cr group (5g Cr + 5g maltodextrin; four times daily; n = 7) or a placebo group (5g maltodextrin; four times daily; n = 5). Following 5 days of treatment, there was no significant increase in either Sports Med 2005; 35 (2) 116 Bemben & Lamont voluntary MVC or electrically evoked MVC between the two groups, which suggests that longer duration Cr supplementation may have been needed for the older subjects. Kilduff et al.[38] investigated the potential ergogenic effects of acute Cr loading (20 g/day Cr + 180 g/day dextrose for 5 days) on body composition and MVC during a bench-press exercise. Thirty-two resistance-trained men were matched according to peak isometric force and then assigned in a doubleblind fashion to either a Cr group or a placebo group. Following a repeated measures ANOVA, it was determined that the Cr group had no significant change in measures of peak force or total force when compared with the placebo group. However, when the Cr grou...
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