Sleep Disordered Breathing During Live High-Train Low in Normobaric Versus Hypobaric Hypoxia

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Saugy, Jonas J.
Schmitt, Laurent
Fallet, Sibylle
Faiss, Raphael
Vesin, Jean-Marc
Bertschi, Mattia
Heinzer, Raphaël
Millet, Grégoire P.
The present study aimed to compare sleep disordered breathing during live high-train low (LHTL) altitude camp using normobaric hypoxia (NH) and hypobaric hypoxia (HH). Sixteen highly trained triathletes completed two 18-day LHTL camps in a crossover designed study. They trained at 1100-1200 m while they slept either in NH at a simulated altitude of 2250 m or in HH. Breathing frequency and oxygen saturation (SpO(2)) were recorded continuously during all nights and oxygen desaturation index (ODI 3%) calculated. Breathing frequency was lower for NH than HH during the camps (14.6 and/- 3.1 breath x min(-1) vs. 17.2 and/- 3.4 breath x min(-1), p < 0.001). SpO(2) was lower for HH than NH (90.8 and/- 0.3 vs. 91.9 and/- 0.2, p < 0.001) and ODI 3% was higher for HH than NH (15.1 and/- 3.5 vs. 9.9 and/- 1.6, p < 0.001). Sleep in moderate HH is more altered than in NH during a LHTL camp.
Publication Reference
High Altitude Medicine & Biology, vol. 17 (3), pp. 233-238