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Glucagon responses to exercise in sheep.

R P Brockman

    Australian Journal of Biological Sciences
    |April 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Exercise training in sheep influences hormonal responses. Trained sheep showed a blunted glucagon increase during exercise compared to untrained sheep, indicating an adaptation to physical exertion.

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    Area of Science:

    • Animal physiology
    • Exercise science
    • Endocrinology

    Background:

    • Understanding the physiological adaptations to exercise is crucial in animal science.
    • Hormonal responses, such as those involving glucagon and insulin, play a key role in regulating metabolism during physical activity.
    • The impact of training on these hormonal responses in sheep requires further investigation.

    Purpose of the Study:

    • To investigate the effects of exercise training on plasma glucagon and insulin concentrations in sheep.
    • To determine if the severity of exercise influences these hormonal responses.
    • To compare the hormonal responses between trained and untrained sheep.

    Main Methods:

    • Sheep were subjected to moderate (5 km/h) and strenuous (7 km/h) exercise protocols on a treadmill for 45 minutes.

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  • Blood samples were collected to measure plasma glucagon and insulin concentrations.
  • Comparisons were made between untrained and trained sheep, as well as between different exercise intensities.

    • Main Results:

    • Plasma glucagon concentrations increased with exercise in all sheep, with a direct relationship to exercise severity.
    • Trained sheep exhibited a lesser increase in plasma glucagon compared to untrained sheep at the same exercise intensity.
    • Plasma insulin concentrations significantly decreased only during strenuous exercise in untrained sheep.

    Conclusions:

    • Exercise training in sheep leads to an attenuated glucagon response to exercise, suggesting metabolic adaptation.
    • The severity of exercise directly impacts glucagon levels, with higher intensity causing greater increases.
    • Insulin sensitivity may be affected differently by exercise intensity and training status in sheep.