Table 1.
Physiological variables at rest during ascent to altitude
| Day (altitude in metres) | Blood pressure (mmHg) | Heart rate (beats/min) | Ventilatory rate (breaths/min) | SpO2 (%) |
|---|---|---|---|---|
| 0 (50) | 126/82 | 64 | 9 | 99 |
| 1 (1300) | 132/87 | 68 | 13 | 98 |
| 2 (2850) | 134/88 | 66 | 15 | 96 |
| 3 (3500) | 146/91 | 68 | 10 | 93 |
| 4 (3500) | 158/93 | 70 | 13 | 94 |
| 5 (3500) | 151/91 | 64 | 8 | 92 |
| 6 (3770) | 140/93 | 83 | 9 | 89 |
| 7 (4250) | 147/95 | 68 | 13 | 90 |
| 8 (4250) | 142/84 | 72 | 11 | 84 |
| 9 (4250) | 157/93 | 64 | 11 | 86 |
| 10 (4950) | 148/96 | 76 | 10 | 88 |
| 11 (5160) | 143/92 | 71 | 11 | 82 |
| 12 (5300) | 146/97 | 71 | 14 | 76 |
| 13 (5300) | 167/106 | 63 | 15 | 77 |
Subjects initially flew from London (day 0) to Kathmandu (day 1). They then flew to Lukla (2850 m) (day 2) before trekking to Everest Base Camp (5300 m) over 11 days