High Altitude Sleep Disturbances Monitored by Actigraphy and Polysomnography

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Abstract
Nussbaumer-Ochsner, Nicole Schuepfer, ChristophSiebenmann, Marco Maggiorini, and Konrad E. Bloch.High altitude sleep disturbances monitored by actigraphy and polysomnography. High. Alt. Med. Biol. 12:229–236.—Aims: Data on sleep at altitude are scant due to the limited availability of polysomnography. Therefore, we investigated whether actigraphy might serve as a simple tool for monitoring sleep during altitude field studies. Methods: Fourteen mountaineers participating in studies on dexamethasone prophylaxis of high altitude pulmonary edema were monitored by actigraphy and polysomnography during 1 night at Zurich (490 m) and 4 nights at the Regina Margherita hut (4559 m). Total sleep time (TST) estimated by actigraphy was compared to polysomnography and subjective sleep quality. Results: In 64 comparisons, mean differences±2SD (bias±limits of agreement) between actigraphy and polysomnography were 5±35 min for TST and 1±7% for sleep efficiency. Correlations between subjective and polysomnographic estimates of sleep efficiency and sleep latency were nonsignificant. Medians of nocturnal oxygen saturation were 96% at 490 m and 74%–81% during nights 1 to 4 at 4459 m (pp=NS) but the proportions of slow wave and REM sleep were reduced and arousals were more common (pConclusion: Actigraphy accurately estimates sleep efficiency and duration. Due to its portability and simple use and the potential application over several weeks, it is a convenient tool for investigating altitude effects on sleep during field studies.

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