Table 2. Effect of caffeine on time to exhaustion, load, heart rate (HR), relative oxygen consumption (VO), carbon dioxide production (VCO), expired volume (VE), respiratory rate (RR) and respiratory exchange ratio (RER). Data are means (±SD).
Time
(min)		 Load
(W)		 HR
(bpm)		 VO2
(ml·kg-1·min-1)		 VCO2
(ml·min-1)		 VE
(l·min-1)		 RR
(rpm)		 RER
Placebo 11.35 (1.45) 328
(24)		 184
(5)		 38.5
(5.0)		 4050
(598)		 123.1 (22.3) 47.7 (8.4) 1.46
(.14)
Caffeine 12.08 (1.59)** 336
(24)*		 190
(6)**		 41.6
(6.5)*		 4136
(1183)		 136.2 (22.7)* 51.7 (7.4) 1.40 (.13)*
* p< 0.05
** p< 0.01.