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Main trends in rectal temperature during sleep. Hypnogram and thermogram
H Almirall1, M C Nicolau, A Gamundi
1Departament de Psiquiatria i Psicobiologia Clínica, Universitat de Barcelona, Spain.
Neuropsychobiology
|January 1, 1997
Summary
This study reveals ultradian oscillations in body temperature during sleep, linked to sleep stages. Analyzing nighttime body temperature patterns provides insights into sleep-wake cycles and their regulation.
Area of Science:
- Physiology
- Sleep Science
- Chronobiology
Background:
- Night-time body temperature exhibits complex patterns related to sleep.
- Understanding the relationship between body temperature and sleep stages is crucial for sleep research.
Purpose of the Study:
- To investigate the relationship between sleep states and night-time body temperature patterns.
- To identify oscillations and correlations within thermoregulation and sleep architecture.
Main Methods:
- Analyzed body temperature and sleep stage data from 13 healthy young men.
- Applied mathematical modeling (two-term function, linear regression) to temperature data for stationarity.
- Utilized Fast Fourier Transformation and cross-correlation functions to analyze hypnogram and thermogram data.
Main Results:
- Identified three distinct segments in the night-time thermogram: initial rapid drop, slow decrease to thermal minimum, and final temperature increase.
- Revealed ultradian oscillations (90-100 min period) in some temperature series after achieving stationarity.
- Found significant cross-correlations between specific sleep stages and body temperature fluctuations.
Conclusions:
- Night-time body temperature regulation shows distinct phases and ultradian rhythms.
- The dynamics of body temperature changes are closely intertwined with sleep stage progression.
- Parameters of early temperature drop correlate with the temporal precedence between sleep and temperature patterns.