Table 2
Effect of caffeine or placebo on heart rate (HR), rating of perceived exertion (RPE), oxygen uptake (VO) and respiratory exchange ratio (RER) during 15 min of steady state cycling (Phase A). Values are means (±SD, n=10).
Time
Placebo
Caffeine
Mean change (%) ± 90%
confidence limits
P
HR
5 min
130 (12)
129 (10)
-.07 (.57)
10 min
134 (10)
136 (13)
-.37 (.68)
15 min
138 (12)
140 (12
.23 (.61)
.81
RPE
5 min
11 (2)
10 (2)
-.04 (.56)
10 min
11 (2)
11 (2)
-
15 min
11 (2)
11 (2)
-
.74
VO
2
(mL·kg
-1
·min
-1
)
5 min
16.05 (3.92)
16.93 (4.03)
.22 (.24)
10 min
16.79 (3.91)
17.27 (3.33)
.12 (.19)
15 min
15.85 (3.64)
17.78 (3.93)
.53 (.28)
.08
RER
5 min
.95 (.08)
.94 (.08)
-.21 (.52)
10 min
.89 (.05)
.91 (.07)
.43 (1.18)
15 min
.90 (.04)
.88 (.08)
-.35 (.73)
.31
P indicates interaction effect of time and trial.