Table 1.
Cardioventilatory responses during 5-km cycling time trials
| Start | 1st km | 2nd km | 3rd km | 4th km | 5th km | |
|---|---|---|---|---|---|---|
| V̇e, L/min | ||||||
| NORM | 70 ± 33 | 112 ± 23 | 142 ± 31 | 147 ± 37 | 150 ± 33 | 165 ± 26 |
| HCTRL | 57 ± 23 | 99 ± 26 | 121 ± 30* | 126 ± 29* | 136 ± 31 | 154 ± 39 |
| HFENT | 54 ± 16 | 92 ± 27 | 118 ± 37* | 128 ± 34* | 139 ± 38 | 152 ± 28 |
| HR, beats/min | ||||||
| NORM | 115 ± 17 | 145 ± 11 | 158 ± 14 | 165 ± 13 | 170 ± 12 | 176 ± 12 |
| HCTRL | 122 ± 22 | 146 ± 14 | 156 ± 15 | 163 ± 12 | 173 ± 17 | 178 ± 14 |
| HFENT | 117 ± 16 | 147 ± 13 | 161 ± 10 | 167 ± 11 | 173 ± 11 | 179 ± 11 |
Data are presented as group means ± SD (n = 8 subjects). HCTRL, 5-km cycling time trial, intact afferent feedback, 100% O2; HFENT, 5-km cycling time trial, blocked afferent feedback, 100% O2; HR, heart rate; NORM, 5-km cycling time trial, intact afferent feedback, room air; V̇e, minute ventilation.
*
P < 0.05 vs. NORM.