Pomidori, Luca, Daniela Bonardi, Federica Campigotto, Valter Fasano, Alessandra Gennari, Gabriele Valli, Paolo Palange, and Annalisa Cogo. The hypoxic profile during trekking to the Pyramid Laboratary. High Alt. Med. Biol. 10:233-237, 2009.-The oxygen saturation values reported in the high altitude literature are usually taken during a few minutes of measurement either at rest or during exercise. We aimed to investigate the daily hypoxic profile by monitoring oxygen saturation for 24h in 8 lowlanders (4 females, ages 26 to 59) during trekking from Lukla (2850m) to the Pyramid Laboratory (5050m). Oxygen saturation was measured (1) daily at each altitude (sm), (2) for 24-h during ascent to 3500m, 4200m, and on day 1 at 5050m (lm), and (3) during a standardized exercise (em). Results: (1) the sm and lm values were 90.9% (±0.5) and 86.4% (±1.1) at 3500m; 85.2%(±1.1), and 80% (±1.9) at 4200m; 83.8%(±1) and 77% (±1.7) at 5050m (p≤0.05); (2) the daily time spent with oxygen saturation ≤90% was 56.5% at 3500m, 81% at 4200m, and 95.5% at 5050m; (3) during exercise, oxygen saturation decreased by 10.58%, 13.43%, and 11.24% at 3500, 4200, and 5050m, respectively. In conclusion, our data show that the level of hypoxemia during trekking at altitude is more severe than expected on the basis of a short evaluation at rest and should be taken into account.
- Arterial oxygen saturation
- Field studies at high altitude
- Pulse oximetry
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health