Creatine Supplementation

46 unfortunately no interaction term could be

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Unformatted text preview: term could be assessed since the authors only used t-tests to statistically analyse the data. Ziegenfuss et al.[45] studied highly anaerobically trained collegiate athletes to assess the effects of 3 days of Cr ingestion on cycle ergometer power output. Twenty division I athletes (ten males and ten females) were selected and randomly assigned to a Cr group (n = 10; 0.35g Cr/kg fat-free mass) or placebo group (n = 10; 0.35g maltodextrin/kg fatfree mass). Subjects completed six maximal 10-second cycle sprints with 60 seconds recovery between sprints prior to treatment and after 3 days of the treatment. MRI techniques were used to obtain ten transaxial images of both thighs pre- and post-treatment. Repeated measures analysis revealed that Cr supplementation resulted in significant increases in total body mass (0.9 ± 0.1kg) compared with the placebo group. There was also a significant 6.6% increase in thigh volume for the Cr group that was attributed to an increase in intracellular water with no change for the placebo group. A significant increase was also seen in total work performed during the first sprint as well as peak power output during sprints two through six, the total amount of work performed, and the peak power produced during the repeated cycle sprint protocol. When male and female subgroups (within the Cr group) were examined, the males exhibited the highest initial peak power relative to lean body mass; however, after three of the sprints had been completed, the reverse trend was seen, that is, females exhibited the greater relative peak power output.[45] The drop in power output relative to body mass is similar to the findings presented by Linnamo et al.[65] who used explosive repetitive weight-lifting tasks. Although males exhibit both higher absolute and relative power out 2005 Adis Data Information BV. All rights reserved. Bemben & Lamont puts, they also experience a greater amount of central fatigue than females. Additionally, the greater initial power output seen with males has previously been shown to be related to greater systemic testosterone levels and greater amounts of fat-free mass.[63] Deutekom et al.[50] assess...
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This note was uploaded on 01/28/2014 for the course BI 231 taught by Professor Richardmay during the Fall '13 term at Southern Oregon.

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