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Sleep-Wake Cycle in Young and Older Mice
Sara Soltani1,2, Sylvain Chauvette2, Olga Bukhtiyarova1,2
1Department of Psychiatry and Neuroscience, Faculty of Medicine, Université Laval, Québec, QC, Canada.
Frontiers in Systems Neuroscience
|October 16, 2019
Summary
Older mice sleep more and experience fragmented sleep during their active phase, showing increased delta power, unlike some human aging sleep patterns. These findings offer insights into aging sleep research.
Area of Science:
- Neuroscience
- Sleep Science
- Aging Research
Background:
- Sleep is crucial for cognitive function, and aging significantly alters sleep patterns.
- Human studies show decreased sleep efficiency and slow-wave sleep (SWS) with age.
- Conflicting results exist regarding aging-related sleep changes in mice.
Purpose of the Study:
- To investigate age-dependent changes in mouse sleep-wake cycles.
- To compare mouse aging sleep patterns with human age-related sleep alterations.
- To understand the correspondence between mouse and human sleep features during aging.
Main Methods:
- Utilized local-field potentials (LFPs) to analyze sleep/wake cycles in young (3-month-old) and older (12-month-old) C57BL/6 mice.
- Examined sleep fragmentation, sleep during the active (dark) phase, and delta power (1-4 Hz).
- Investigated regional specificity of electrographic activities across cortical areas.
Main Results:
- Older mice exhibited increased total sleep time, primarily during the dark phase.
- Higher sleep fragmentation and increased sleep during the active phase (naps) were observed in older mice.
- Older mice displayed greater delta power in the frontal cortex and a trend for increased slow wave density.
Conclusions:
- Aging effects on mouse sleep-wake activities are predominantly observed during the dark phase.
- Electrode location significantly impacts sleep state detection accuracy.
- While differences exist, some mouse aging sleep features parallel those seen in humans, aiding comparative aging sleep studies.
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