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Related Experiment Videos

Brain temperatures in running quail

D L Kilgore, G F Birchard, D F Boggs

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |June 1, 1981
    PubMed
    Summary

    Bobwhite quail running or heat-stressed show lower hypothalamic (brain) than colonic (body) temperatures. This body-to-brain temperature difference increases with exercise intensity, suggesting efficient heat exchange.

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    Area of Science:

    • Physiology
    • Thermoregulation
    • Avian Biology

    Background:

    • Understanding avian thermoregulation is crucial for survival in varying environments.
    • The bobwhite quail (Colinus virginianus) serves as a model for studying heat balance in birds.

    Purpose of the Study:

    • To investigate the relationship between hypothalamic (Tb) and colonic (Tc) temperatures in bobwhite quail under different thermal and exercise conditions.
    • To explore the role of arteriovenous heat exchange in managing body heat during exercise and heat stress.

    Main Methods:

    • Simultaneous measurement of hypothalamic and colonic temperatures in bobwhite quail.
    • Birds were subjected to resting and treadmill running conditions (0.42–0.75 m.s-1) at varying air temperatures (room, 30°C, and 30–45°C).

    Main Results:

    • Hypothalamic temperatures were consistently lower than colonic temperatures in both heat-stressed and exercising quail.
    • The body-to-brain temperature difference increased with running speed at 30°C air temperature.
    • This difference at high exercise loads (30°C) was comparable to extreme heat stress (45°C ambient temperature).

    Conclusions:

    • Exercising and heat-stressed bobwhite quail maintain a lower brain temperature than core body temperature.
    • Enhanced heat transfer, potentially via the rete mirabile ophthalmicum, aids in regulating brain temperature during intense activity and heat exposure.

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