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metronome set at a frequency of 19Hz and measures
of mean power and average velocity were recorded
by a rotary encoder. A significant group by time
interaction indicated a significantly greater improvement in repetitions performed to fatigue, total
average power during the power endurance test, and
1RM half squat for the Cr group. Additionally, there
was less of a decline in the power/velocity from
CMVJ 1 to CMVJ 2 for the Cr group and a decrease
in average running times over the first 5m during
Similar improvements in sprint performance
were reported by Skare et al. Eighteen male track
sprinters, with at least 3 years of experience in
regional competition were randomly assigned to
either a Cr group (n = 9; 20g Cr + 20g glucose/day)
or a placebo group (n = 9; 40g glucose/day). There
were significant increases in 100m sprint performance and repeated sprint performance for the Cr
group, while the placebo group had no improvement
from pre- to post-conditions. One problem with the
data analyses is that it was unclear if a group by time
interaction was evaluated or if only paired t-tests
were used to evaluate the data.
Improved sprint performance was also demonstrated by Cox et al. using elite soccer players.
Twelve subjects with a mean age of 22.1 years were
given a standard diet that provided 7g carbohydrate/
kg BW for a 24-hour period before each test session.
Each of the two test sessions were separated by 7 2005 Adis Data Information BV. All rights reserved. 117 days and included 11 all-out 20m sprints, two agility
runs and one ball-kicking drill, each separated by
20m walks, jogs or runs during a 1-hour time period.
After the first test session, the subjects were
randomised into a treatment (5g Cr four times daily
for 6 days) or a placebo group in a double-blind
fashion and were then re-tested on the original test
items. Body mass was increased significantly more
for the Cr group yet they had better repeated sprint
times and better agility runs with lower heart rates
and lower lactate levels than the placebo group.
Sprint performance was also...
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