Table 4
Heart rate (HR), rating of perceived exertion (RPE), oxygen uptake (VO) and respiratory exchange ratio (RER) during 10 min of self-selected intensity cycling (Phase B). Values are means (±SD, n=10).
Time
Placebo
Caffeine
Mean change (%)
± 90% confidence limits
P
HR
5 min
159 (17)
169 (14)
.59 (.50)
10 min
167 (21)
178 (10)
.53 (.49)
.69
RPE
5 min
13 (2)
13 (2)
-.06 (.38)
10 min
15 (2)
14 (2)
-.14 (.60)
.79
VO
2
(mL.kg
-1
.min
-1
)
5 min
21.74 (3.41)
23.59 (4.28)
.54 (.69)
10 min
22.97 (4.43)
25.22 (4.31)
.51 (.69)
.75
RER
5 min
.99 (.08)
1.01 (.09)
.23 (.59)
10 min
.94 (.05)
.95 (.06)
.08 (.63)
.43
P indicates interaction effect of time and trial.