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. 2015 Dec 1;5(4):167–175. doi: 10.1089/jcr.2015.0022

FIG. 1.

FIG. 1.

Effects of acute caffeine on subjective responses. Mean ± SEM change in Addiction Research Center Inventory (ARCI) subscale response (top) and responses on Brief Mood Questionnaire (bottom) from baseline to peak after placebo (black bars), 1 mg/kg (light gray bars), or 2 mg/kg (dark gray bars) of caffeine. For all ARCI subscales and Brief Mood Questionnaire choices shown here, both doses of caffeine resulted in significantly greater changes in responses than did the placebo. * = significantly different from caffeine (1 mg/kg and 2 mg/kg); p < 0.05.