A study of the effect of caffeine on muscle metabolism used eighteen male volunteers who each underwent arm exercise tests. Nine of the men were randomly selected to take a capsule containing pure caffeine one hour before the test. The other men received a placebo capsule. During each exercise the subject's respiratory exchange ratio (RER) was measured. What is your conclusion on effect of caffeine on respiratory exchange rate? Placebo 105 119 100 97 96 101 94 95 98 Caffeine 96 99 94 89 96 93 88 105 88

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