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Related Experiment Videos

Myocardial flow and function after regional beta-blockade in exercising dogs.

H Mass1, P A Gwirtz

  • 1Department of Physiology, Texas College of Osteopathic Medicine, Forth Worth 76107.

Medicine and Science in Sports and Exercise
|October 1, 1987
PubMed
Summary

Beta-1 adrenergic receptors primarily control cardiac function and coronary blood flow during exercise in dogs. Beta-2 receptors have a minor role in regulating coronary vascular flow.

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Area of Science:

  • Cardiovascular Physiology
  • Adrenergic Receptor Pharmacology

Background:

  • Adrenergic receptors play a crucial role in regulating cardiovascular function.
  • Understanding the specific roles of beta-1 and beta-2 adrenergic receptors is vital for comprehending cardiac and coronary blood flow responses during physiological stress like exercise.

Purpose of the Study:

  • To investigate the distinct contributions of beta-1 and beta-2 adrenergic receptors in modulating coronary blood flow and cardiac function during exercise in a canine model.
  • To differentiate the effects of selective and non-selective beta-adrenergic blockade on myocardial performance and vascular dynamics.

Main Methods:

  • Chronically instrumented dogs were used to measure left circumflex coronary blood flow velocity (CFV), heart rate, and left ventricular function (pressure, dP/dtmax, %systolic shortening, dL/dt(s)max).

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  • Regional administration of propranolol (non-selective beta-blocker), atenolol (selective beta-1 blocker), and ICI 118,551 (selective beta-2 blocker) into the circumflex artery during exercise was performed.

    • Main Results:

    • Exercise significantly increased all measured cardiovascular parameters, including CFV, heart rate, and left ventricular function indices.
    • Non-selective and selective beta-1 blockade reduced cardiac function and CFV, with beta-1 blockade showing a more pronounced effect on contractile function.
    • Selective beta-2 blockade primarily decreased CFV, indicating a minor role in coronary vascular flow regulation during exercise.

    Conclusions:

    • Myocardial contractile function and coronary blood flow reductions during exercise are predominantly mediated by beta-1 adrenergic receptor stimulation.
    • Beta-2 adrenergic receptors appear to have a limited, though significant, role in modulating coronary vascular flow, potentially via vascular or pre-synaptic mechanisms.