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) |
VE: minute ventilation, RER: respiratory exchange ratio, [La−]: blood lactate accumulation, HR: heart rate
a Significantly different from 12.0 km·h−1
b Significantly different from 18.0 km·h−1
c Significantly different from 8.4 km·h−1
d Significantly different from 9.6 km·h−1, p < 0.05