Creatine Supplementation

41 sprint performance was also significantly improved

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Unformatted text preview: significantly improved when a sample of squash players were supplemented with Cr (0.075 g/kg BW, four times daily for 5 days) in a double-blind, placebo-controlled, crossover study.[43] Sprint times that were assessed in a simulated squash protocol improved for both groups, but improved to a greater extent following Cr supplementation; however, unlike the Cox et al. results,[41] heart rates and lactate levels were unaffected by Cr. In general, the literature seems to support the use of Cr supplementation for shortterm, intense activities such as jumping and sprinting 2.2.2 Cycling The use of cycle ergometry to assess indices of anaerobic power has commonly been used in previous Cr research. Measures of peak and mean power (W), time to peak power (seconds), total work (J) and fatigue index (%) have been shown to be positively affected by Cr supplementation.[64] Additionally, a number of studies have addressed the effects of Cr ingestion upon indices of Wingate performance since the year 2000. Green et al.[46] randomly assigned 19 physically active men to either a Cr group (n = 9; 20 g/day for 6 days) or a placebo group (n = 10; 20g sucrose + maltodextrin/day). Before and after supplementation, subjects performed three arm Wingate tests (AW1, AW2, AW3), then three leg Wingate tests (LW1, LW2, LW3) on consecutive days. Each Wingate trial was separated by 2 minutes of recovery. Test variables compared between groups included peak power (W), mean power (W), and percentage power decline (%). There was no significant differSports Med 2005; 35 (2) 118 ence from pre- to post-test for mean power output for both the arm and leg trials. There was no change in peak power for either groups Wingate tests; however, peak power increased significantly for the Cr group during AW1, and for the placebo group during AW1 and AW3. Percentage decline for the Cr group was significantly decreased (pre- to post-test) and was significantly less than the placebo group after LW2.[46] Unfortunately, no interaction...
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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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