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Updated: Jun 6, 2026
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A New Method for Inducing a Depression-Like Behavior in Rats
Published on: February 22, 2018
Lowering barometric pressure aggravates depression-like behavior in rats.
Hiroyuki Mizoguchi1, Kanoko Fukaya, Rarami Mori
1Futuristic Environmental Simulation Center, Research Institute of Environmental Medicine, Nagoya University, Nagoya 464-8601, Japan.
Behavioural Brain Research
|December 7, 2010
Summary
Lowering barometric pressure (LP) worsens depression-like behaviors in rats. This study shows that weather changes, specifically reduced atmospheric pressure, can exacerbate emotional impairment, suggesting a link between climate and mood disorders.
Area of Science:
- Environmental Psychology
- Neuroscience
- Animal Behavior
Background:
- Human mood disorders are known to be influenced by weather changes.
- Previous research has not investigated the impact of climatic factors on animal models of emotional impairment.
- The forced swim test in rats is a validated model for assessing behavioral despair and depression-like states.
Purpose of the Study:
- To investigate the effect of lowered barometric pressure (LP) on immobility time in rats during the forced swim test.
- To determine if LP influences the development or maintenance of depression-like behaviors.
- To explore the relationship between natural weather variations and emotional impairment in an animal model.
Main Methods:
- Rats were subjected to repeated forced swim tests, with immobility time measured as an index of behavioral despair.
- The effect of the antidepressant imipramine was assessed to validate the depression-like nature of the immobility.
- Rats were exposed to lowered barometric pressure (20 hPa below natural atmospheric pressure) to evaluate its impact on immobility.
- The study also examined the long-term effects of LP exposure on immobility after a withdrawal period.
Main Results:
- Repeated forced swimming increased immobility time in rats, an effect mitigated by imipramine administration.
- Exposure to lowered barometric pressure significantly increased immobility time in rats undergoing repeated forced swimming.
- Rats exposed to repeated LP showed prolonged immobility even after a withdrawal period, indicating a lasting effect.
Conclusions:
- Lowered barometric pressure, within the range of natural weather changes, exacerbates depression-like behavior in rats.
- These findings suggest a potential environmental trigger for mood disturbances, linking barometric pressure fluctuations to emotional vulnerability.
- The study provides the first animal evidence for the influence of climatic factors on emotional impairment.
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