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Unformatted text preview: esults indicated that after Cr ingestion, power output significantly increased by 5% from exercise
bouts three to seven and total PCr resynthesis was
also significantly increased following 10 minutes of
recovery. There was also a strong positive relationship between inorganic phosphate concentration and
muscle pH after Cr ingestion. It appeared that Cr
ingestion helped maintain power output over repeated bouts of intermittent anaerobic activity by reducing acidic conditions.
Sports Med 2005; 35 (2) The Effects of Creatine in Sport and Exercise In a similar protocol, Cottrell et al. studied the
effect of Cr ingestion and recovery interval on multiple bouts of sprint cycling performance in adult
males. Well trained cyclists were randomised to
either a Cr group (0.3 g/kg BW/day for 6 days) or a
placebo group. Three separate trials of maximal
cycling sprints were used. Cycling bouts consisted
of eight, 15-second, maximal efforts. Subjects were
randomly assigned to recovery interval groups of 1,
3 or 6 minutes, and the same protocol was carried
out again, 7 days later. The use of paired t-tests
indicated that between-trial mean power significantly increased for the Cr groups with 1 and 3 minutes
of recovery, and for the placebo group with 6 minutes of recovery. It appeared that during this study,
Cr supplementation had a positive effect on mean
power maintenance as long as the rest interval was
no longer than 6 minutes, but the lack of assessing
an interaction term following supplementation,
should lead one to closely scrutinise the interpretation of these results.
Contrary to the previous studies, Edwards et
al. examined the effects of Cr supplementation on
anaerobic performance in moderately active men.
Twenty-one subjects were randomly assigned to
either a Cr group (n = 11; 20 g/day for 6 days) or a
placebo group (n = 10). Subjects were tested using
an anaerobic speed test (AST), which required them
to run to fatigue on a treadmill at a constant speed of
13 km/h and 20% gradient. Pri...
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