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Body temperature dependent decrease of gastric blood flow in restraint and water-immersion stressed rats.

I Arai, M Muramatsu, H Aihara

    Journal of Pharmacobio-Dynamics
    |August 1, 1986
    PubMed
    Summary
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    Restraint and water-immersion stress (RWIS) significantly lowers heart rate, gastric blood flow, and body temperature in rats. These changes are linked to reduced cardiac output, not direct neural or autonomic pathways.

    Area of Science:

    • Physiology
    • Stress Response

    Background:

    • The cardiovascular system is sensitive to various stressors.
    • Understanding stressor effects on physiological parameters is crucial for health research.

    Purpose of the Study:

    • To investigate the impact of restraint and water-immersion stress (RWIS) on rat cardiovascular function and body temperature.
    • To elucidate the mechanisms behind RWIS-induced physiological changes.

    Main Methods:

    • Rats were subjected to restraint and water-immersion stress (RWIS) or restraint stress (RS) alone.
    • Measurements included blood pressure, heart rate, gastric blood flow, carotid artery and aortic blood flow, and body temperature.
    • Pharmacological interventions (atropine, hexamethonium, vagotomy, phenoxybenzamine) were used to explore underlying pathways.

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    Main Results:

    • RWIS significantly decreased heart rate, gastric blood flow, common carotid artery and descending aorta blood flow, and body temperature compared to RS.
    • Blood pressure did not differ between RWIS and RS groups.
    • The observed decreases were not significantly altered by autonomic blockade or vagotomy, suggesting a non-autonomic mechanism.
    • Gastric blood flow reduction was independent of atropine and phenoxybenzamine.
    • A strong correlation was found between decreased gastric blood flow, heart rate, and body temperature.

    Conclusions:

    • RWIS induces significant cardiovascular and thermoregulatory changes in rats.
    • The reduction in gastric blood flow appears to be a consequence of decreased cardiac output leading to hypothermia, rather than direct neural or autonomic regulation.
    • These findings highlight the complex physiological response to combined stressors.