Table 2. Cardiorespiratory variables and blood lactate accumulation for each stage of the incremental exercise test. Data are means (±SD, n =10)
Speed
(km·h–1)		 6.0 7.2 8.4 9.6 10.8 12.0 13.2 14.4 15.6 16.8 18.0
VE
(l·min–1)		 40.7
(6.4)		 52.8ab
(7.9)		 58.9
(7.1)		 65.7 b
(9.7)		 74.0
(10.8)		 81.3
(8.6)		 91.5
(9.9)		 118.6
(14.5)		 122.3
(13.4)		 122.3
(10.0)		 143.0
(12.0)
RER .84
(.05)		 .92
(.03)		 .95
(.04)		 .96
(.04)		 1.00
(.06)		 1.01
(.05)		 1.05
(.07)		 1.10
(.08)		 1.14
(.10)		 1.14
(.07)		 1.15
(.09)
[La–]
(mmol·l–1)		 1.3 b
(.5)		 1.3 b
(.4)		 1.3 b
(.3)		 1.8 b
(.7)		 1.8 b
(.6)		 2.2 b
(.8)		 2.6 b
(1.0)		 3.55 b
(1.1)		 4.7
(1.2)		 5.7
(1.6)		 8.3
(1.8)
HR
(bpm)		 110 cd
(15)		 127 d
(15)		 135
(16)		 144
(18)		 152
(18)		 160
(17)		 167
(15)		 179
(14)		 180
(13)		 181
(11)		 183
(12)
V: minute ventilation, RER: respiratory exchange ratio, [La]: blood lactate accumulation, HR: heart rate Significantly different from 12.0 km·h Significantly different from 18.0 km·h Significantly different from 8.4 km·h Significantly different from 9.6 km·h, p < 0.05