A two-way (supplement sprint number) ANOVA with repeated measures on both factors was used to evaluate the effects of caffeine on multiple sprint performance. Analyses for measures of blood lactate and RPE were similar to those for measures of performance except that the factors of ‘supplement’ and ‘sprint number’ were replaced with those of ‘trial’ (3 levels) and ‘time’. The effects of caffeine supplementation on plasma caffeine (including primary metabolites of paraxanthine, theophyline, and theobromine), heart rate, and summary multiple sprint data (fastest time, mean time, and fatigue) were determined using one-way ANOVA with repeated measures. was set at 0.05 for all analyses with onferroni adjustments for multiple comparisons. The possibility that the effects of caffeine supplementation on performance were influenced by habitual caffeine consumption was investigated by deriving correlations between estimated daily caffeine consumption and caffeine-induced changes (relative to placebo) in summary multiple sprint data. Correlation coefficients were interpreted in accordance with the following scale of magnitudes as devised by Cohen (4): r
0.1 is trivial; 0.1 r 0.3 is small; 0.3 r 0.5 is moderate; r 0.5 is large. The above analyses provided 95% confidence limits for all estimates.
A two-way (supplement sprint number) ANOVA with repeated measures on both factors was used to evaluate the effects of caffeine on multiple sprint performance. Analyses for measures of blood lactate and RPE were similar to those for measures of performance except that the factors of ‘supplement’ and ‘sprint number’ were replaced with those of ‘trial’ (3 levels) and ‘time’. The effects of caffeine supplementation on plasma caffeine (including primary metabolites of paraxanthine, theophyline, and theobromine), heart rate, and summary multiple sprint data (fastest time, mean time, and fatigue) were determined using one-way ANOVA with repeated measures. was set at 0.05 for all analyses with onferroni adjustments for multiple comparisons. The possibility that the effects of caffeine supplementation on performance were influenced by habitual caffeine consumption was investigated by deriving correlations between estimated daily caffeine consumption and caffeine-induced changes (relative to placebo) in summary multiple sprint data. Correlation coefficients were interpreted in accordance with the following scale of magnitudes as devised by Cohen (4): r
0.1 is trivial; 0.1 r 0.3 is small; 0.3 r 0.5 is moderate; r 0.5 is large. The above analyses provided 95% confidence limits for all estimates.
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