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Intermittent hypoxic exposure does not improve sleep at 4300 m
Juli E Jones1, Stephen R Muza, Charles S Fulco
1Thermal and Mountain Medicine Division, U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, USA.
High Altitude Medicine & Biology
|January 1, 2009
Summary
Intermittent hypoxic exposure (IHE) did not improve sleep quality or oxygen saturation at high altitude. Acclimatization benefits from IHE were lost within 60 hours of the last treatment before altitude exposure.
Area of Science:
- Physiology
- Altitude Medicine
- Sleep Science
Background:
- High altitude exposure poses challenges to sleep quality and oxygen saturation.
- Normobaric intermittent hypoxic exposure (IHE) is a potential method for acclimatization.
- The efficacy of IHE in improving sleep at altitude requires further investigation.
Purpose of the Study:
- To determine if 6-7 days of normobaric IHE improves sleep quality and oxygen saturation in sea-level residents upon rapid ascent to 4300m.
- To test the hypothesis that IHE enhances sleep arterial oxygen saturation (SaO2) and reduces desaturation events at altitude.
Main Methods:
- Ten sea-level residents underwent normobaric IHE, while six served as a SHAM control group.
- Sleep quantity, SaO2, and heart rate (HR) were monitored at sea level and during altitude exposure (4300m) before and after the intervention.
- Intermittent hypoxic exposure involved sedentary and exercising periods in a hypoxia room.
Main Results:
- Both IHE and SHAM groups showed improved sleep SaO2 and reduced desaturation events at altitude post-intervention.
- The IHE group exhibited lower sleep HR but a trend towards more awakenings compared to the SHAM group.
- Resting SaO2 increased during IHE, but this acclimatization appeared to diminish within 60 hours of the final treatment.
Conclusions:
- Normobaric IHE did not provide additional benefits for sleep quality or SaO2 at 4300m compared to a SHAM control.
- The observed ventilatory acclimatization from IHE was likely lost before the post-test altitude exposure.
- Further research is needed to optimize IHE protocols for sustained altitude acclimatization and improved sleep.
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