Skip to main content

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)