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Exercise training and coronary collateral circulation.

B A Franklin1

  • 1Department of Medicine, William Beaumont Hospital, Royal Oak, MI 48072.

Medicine and Science in Sports and Exercise
|June 1, 1991
PubMed
Summary
This summary is machine-generated.

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Exercise may improve coronary collateral circulation by triggering ischemia, but direct human evidence remains limited. Studies show potential benefits, yet conclusive proof is lacking.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Coronary Circulation

Background:

  • Coronary collateral circulation is vital for myocardial oxygen supply.
  • Exercise training is hypothesized to enhance collateral growth.
  • Understanding exercise's role in collateralization is crucial for cardiovascular health.

Purpose of the Study:

  • To review the potential for exercise to increase coronary collateral circulation.
  • To examine the functional significance of collateral vessels.
  • To highlight limitations in animal and human studies on exercise-induced collateralization.

Main Methods:

  • Review of animal and human studies on exercise and coronary collateral circulation.
  • Analysis of evidence for exercise-induced myocardial ischemia as a trigger for collateral growth.

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  • Evaluation of methodologies, including exercise testing, scintigraphy, and angiography.

    • Main Results:

    • Some human studies suggest moderate-to-high intensity training increases myocardial oxygen supply, indicated by higher double product at angina onset.
    • Thallium-201 exercise scintigraphy data assessing perfusion changes post-training are conflicting.
    • Angiographic studies in group trials have not provided conclusive evidence of exercise-induced collateralization in humans.

    Conclusions:

    • Direct evidence for exercise stimulating coronary collateralization in humans is currently lacking.
    • Methodological limitations in existing studies hinder definitive conclusions.
    • Further research with robust methodologies is needed to confirm exercise's role in collateral growth.