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Related Experiment Videos

Hypoxia-induced metabolic and core temperature changes in the squirrel monkey.

D H Horstman, L E Banderet

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |February 1, 1977
    PubMed
    Summary

    Hypoxia significantly reduces core body temperature (Tre) and oxygen uptake (VO2) in squirrel monkeys. Adding carbon dioxide to hypoxic conditions prevents these reductions, suggesting oxygen transport is key to heat production.

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    Area of Science:

    • Physiology
    • Environmental Medicine
    • Animal Models

    Background:

    • Reduced core body temperature (Tre) during hypoxia is a known phenomenon.
    • The precise mechanisms linking oxygen availability to thermoregulation require further elucidation.

    Purpose of the Study:

    • To investigate the relationship between hypoxia, oxygen uptake (VO2), and core body temperature (Tre) in squirrel monkeys.
    • To determine the role of oxygen transport in modulating heat production under hypoxic conditions.

    Main Methods:

    • Squirrel monkeys were exposed to varying oxygen concentrations (21%, 11%, and 11% O2 + 5% CO2) while restrained.
    • Measurements included core temperature (Tre), skin temperatures, oxygen uptake (VO2), mean arterial blood pressure (BPa), heart rate (HR), and arterial blood gases (PaO2, PaCO2).

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    Main Results:

    • Exposure to 11% O2 decreased VO2 by 20% and Tre by 1.8°C, with skin temperatures mirroring Tre.
    • Adding 5% CO2 to 11% O2 prevented decreases in VO2 and Tre.
    • Individual responses varied, with higher blood pressure and heart rate in monkeys with less significant Tre reduction, correlating with better oxygenation (PaO2, SaO2) and lower CO2 (PaCO2).

    Conclusions:

    • Reduced heat production, driven by impaired oxygen transport, is a primary cause of decreased core body temperature during hypoxia.
    • Carbon dioxide addition mitigates the effects of hypoxia on thermoregulation and oxygen consumption.
    • Squirrel monkeys serve as a relevant model for studying physiological responses to hypoxic stress.