Related Experiment Video
Updated: May 1, 2026
05:00
Short-Duration Hypothermia Induction in Rats using Models for Studies examining Clinical Relevance and Mechanisms
Published on: March 3, 2021
4.4K
Provocative motion causes fall in brain temperature and affects sleep in rats
Experimental Brain Research
|March 25, 2014
Summary
Provocative motion in rats disrupts sleep architecture, reduces brain temperature and heart rate, but does not activate sympathetic responses. This study identifies new physiological correlates for nausea research in animal models.
Area of Science:
- Neuroscience
- Physiology
- Sleep Research
Background:
- The neural mechanisms underlying nausea remain poorly understood, largely due to a lack of valid animal models.
- Existing animal models for nausea have limited face validity, hindering research progress.
Purpose of the Study:
- To investigate new physiological correlates of nausea in rats using provocative motion.
- To determine the effects of motion sickness induction on sleep architecture, brain temperature, heart rate (HR), and arterial pressure in rats.
Main Methods:
- Six male Sprague-Dawley rats were surgically prepared for electroencephalography (EEG), electromyography (EMG), hypothalamic temperature, and arterial pressure monitoring.
- Rats were subjected to 40 minutes of rotation at 0.5 Hz to induce motion sickness.
- Physiological parameters were recorded during baseline, rotation, and post-rotation periods. The 5-HT3 antagonist ondansetron was administered to assess its effects.
Main Results:
- Provocative motion led to a complete abolition of Rapid Eye Movement (REM) sleep during rotation and a significant reduction post-rotation.
- Non-Rapid Eye Movement (NREM) sleep was reduced both during and after motion exposure.
- A notable decrease in brain temperature (from 37.1°C to 36.0°C) and heart rate (from 375 bpm to 327 bpm) was observed.
- Arterial pressure remained unaffected, and ondansetron showed no significant impact on the measured parameters.
Conclusions:
- Provocative motion in rats induces sustained arousing effects without sympathetic activation, suggesting a distinct physiological response compared to typical arousal states.
- The observed motion-induced hypothermia supports the hypothesis of a coordinated thermoregulatory response, similar to humans, contributing to nausea-like symptoms in rats.
- These findings provide novel physiological markers for nausea and motion sickness in a rat model, advancing the study of its neural substrates.
