Key result
Simulated evacuation shelter and car sleep environments increased wake after sleep onset and stage shifts, and altered glucose dynamics and heart rate variability compared to sleeping at home.
Why the study?
The study aimed to evaluate sleep and sleep-related physiological parameters, including heart rate variability and glucose dynamics, among evacuees by experimentally recreating evacuation shelter and car sleep environments.
Do simulated disaster evacuation sleep environments affect sleep quality and physiological parameters compared to sleeping at home in healthy young men?
Do simulated disaster evacuation sleep environments affect sleep quality and physiological parameters compared to sleeping at home in healthy young men?
Sleeping in simulated disaster evacuation environments negatively impacts sleep quality and alters glucose dynamics and autonomic nervous system activity compared to sleeping at home.
May signal sleep and cardiometabolic risks for evacuees; hypothesis-generating and leaves clinical implications open.
We aimed to evaluate sleep and sleep-related physiological parameters (heart rate variability and glucose dynamics) among evacuees by experimentally recreating the sleep environment of evacuation shelters and cars. Nine healthy young male subjects participated in this study. Two interventions, modeling the sleep environments of evacuation shelters (evacuation shelter trial) and car seats (car trial), were compared with sleep at home (control trial). Physiological data were measured using portable two-channel electroencephalogram and electrooculogram monitoring systems, wearable heart rate sensors, and flash glucose monitors. Wake after sleep onset (WASO) and stage shift were greater in both intervention trials than the control trial, while rapid-eye movement (REM) latency and non-rapid eye movement (NREM) 1 were longer and REM duration was shorter in the evacuation shelter trial than the control trial. Glucose dynamics and power at low frequency (LF.p) of heart rate variability were higher in the car trial than in the control trial. It was confirmed that sleep environment was important to maintain sleep, and affected glucose dynamics and heart rate variability in the experimental situation.
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Ogata et al. (2020) studied Healthy (simulating disaster evacuees) (n=9). Simulated evacuation shelter and car seat sleep environments vs. Sleep at home (control trial) was evaluated on Sleep quality (WASO, stage shift, REM latency, NREM 1, REM duration) and physiological parameters (glucose dynamics, HRV). Simulated evacuation shelter and car sleep environments increased wake after sleep onset and stage shifts, and altered glucose dynamics and heart rate variability compared to sleeping at home.
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