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Published on: August 2, 2017
Age-related changes in sleep-wake rhythm in dog
Takashi Takeuchi1, Etsumori Harada
1Department of Veterinary Physiology, Faculty of Agriculture, Tottori University, Japan. takeuchi@muses.tottori-u.ac.jp
Behavioural Brain Research
|October 19, 2002
Summary
Aged dogs exhibit disrupted sleep-wake cycles, with reduced paradoxical sleep and fragmented wakefulness. This makes them a valuable model for studying human sleep disorders like insomnia and daytime drowsiness.
Area of Science:
- Veterinary Neurology
- Sleep Medicine
- Gerontology
Background:
- Sleep-wake rhythms change with aging in many species.
- Canine sleep patterns offer insights into mammalian sleep physiology.
Purpose of the Study:
- To investigate age-related changes in sleep-wake rhythms and autonomic function in dogs.
- To evaluate aged dogs as a model for human sleep disorders.
Main Methods:
- Radio-telemetry monitoring of electroencephalogram (EEG), electromyogram (EMG), and electrocardiogram (ECG) in aged and young dogs.
- Analysis of vigilance states (wakefulness, slow wave sleep, paradoxical sleep) and heart rate variability (HRV) parameters like the LF/HF ratio.
Main Results:
- Aged dogs displayed significantly reduced paradoxical sleep and fragmented daytime wakefulness.
- Sleep disruption was evident at night, with altered 24-hour sleep-wake patterns.
- Aged dogs showed a diminished variance in the LF/HF ratio, indicating altered autonomic balance.
Conclusions:
- Aged dogs exhibit significant sleep-wake cycle abnormalities, including reduced REM sleep and disrupted sleep maintenance.
- The observed changes in sleep patterns and autonomic balance suggest aged dogs are a relevant model for studying age-related sleep disorders.
- Altered autonomic balance may contribute to the sleep-wake cycle abnormalities observed in aging dogs.
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