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Table 2 Average (mean ± SD) values during the 40 k trial for Ratings of Perceived Exertion, VO2, Respiratory Exchange Ratio, and Heart Rate

From: The influence of a CYP1A2 polymorphism on the ergogenic effects of caffeine

RPE Genotype Caffeine Placebo
  AA 14.3 ± 1.6 14.2 ± 1.6
  C 15.0 ± 1.4 14.9 ± 1.4
VO2 (L·min-1)ab    
  AA 3.08 ± 0.41 2.88 ± 0.49
  C 3.43 ± 0.48 3.23 ± 0.48
RER    
  AA 0.92 ± 0.05 0.91 ± 0.04
  C 0.94 ± 0.05 0.94 ± 0.04
HR (beats per min)a    
  AA 162 ± 10 153 ± 11
  C 170 ± 13 163 ± 14
  1. a-Main effect for Treatment (p < 0.05)b-Main effect for Genotype (p < 0.05)