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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. 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, 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. Additionally, a number of studies have addressed the effects
of Cr ingestion upon indices of Wingate performance since the year 2000.
Green et al. 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. Unfortunately, no interaction...
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