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. 2020 Apr 30;120(7):1495–1508. doi: 10.1007/s00421-020-04384-8

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© The Author(s) 2020

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Fig. 2 — Caffeine–placebo change scores for total work performed during 15-min cycling time trial. a, b ADORA2A genotype ‘high’ (filled bars) and ‘low’ sensitivity to caffeine (open bars). c, d CYP1A2 genotype ‘fast’ (filled bars) and ‘slow’ caffeine metabolisers (open bars). a, c Bars represent individual participants. b, d Data are mean ± SD