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The physiologic sequelae of chronic dynamic exercise.

H K Hammond, V F Froelicher

The Medical Clinics of North America

|January 1, 1985

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Regular dynamic exercise enhances the body's oxygen supply and demand matching. Chronic exercise improves skeletal muscle and heart function, increasing maximal oxygen consumption and endurance.

Area of Science:

Exercise Physiology
Cardiovascular Adaptations
Skeletal Muscle Metabolism

Background:

Acute dynamic exercise triggers complex physiological adjustments.
Chronic exercise induces significant anatomical and physiological changes in skeletal muscle and the heart.

Purpose of the Study:

To outline the physiological adaptations to acute and chronic dynamic exercise.
To examine the impact of exercise on skeletal muscle and cardiac function.
To discuss the role of exercise in coronary heart disease management.

Main Methods:

Review of physiological responses to dynamic exercise.
Analysis of adaptations in skeletal muscle and cardiac muscle.
Examination of exercise effects in patients with coronary heart disease.

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Main Results:

Skeletal muscle adaptations include increased capillary blood volume, mitochondrial density, and oxidative enzymes, leading to enhanced oxidative capacity and fuel utilization.
Chronic exercise results in a slower resting heart rate, larger stroke volume, and increased maximal cardiac output, contributing to improved maximal oxygen consumption.
While exercise improves work capacity in coronary heart disease patients, evidence for significant coronary collateral vessel development due to exercise alone is limited.

Conclusions:

Dynamic exercise induces significant peripheral and central adaptations, improving oxygen delivery and utilization.
Skeletal muscle adaptations are distinct from cardiac muscle changes, and their correlation with overall heart performance requires careful consideration of central and peripheral factors.
Chronic dynamic exercise enhances cardiovascular function and work capacity, particularly in individuals with coronary heart disease, though its role in collateral vessel formation remains debated.