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Related Concept Videos

Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
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Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac...
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Exercise and Cardiovascular Response01:20

Exercise and Cardiovascular Response

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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Regulation of Stroke Volume01:27

Regulation of Stroke Volume

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
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Updated: May 4, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
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Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

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Exercise capacity in the Fontan circulation.

David J Goldberg1, Catherine M Avitabile1, Michael G McBride1

  • 11 Division of Cardiology, The Perelman School of Medicine, The University of Pennsylvania, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America.

Cardiology in the Young
|January 10, 2014
PubMed
Summary
This summary is machine-generated.

The Fontan operation supports circulation but limits exercise capacity due to a missing heart chamber. This decline, worsening with age, stems from reduced oxygen delivery and extraction, suggesting potential interventions.

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Area of Science:

  • Pediatric Cardiology
  • Adult Congenital Heart Disease
  • Cardiovascular Physiology

Background:

  • The Fontan operation establishes a single-ventricle physiology, enabling survival into adulthood.
  • A key limitation is the absence of a sub-pulmonary ventricle, impacting circulatory efficiency.
  • Exercise intolerance is a significant morbidity, manifesting from adolescence and progressing with age.

Purpose of the Study:

  • To elucidate the physiological underpinnings of exercise limitation in Fontan-associated physiology.
  • To identify potential therapeutic targets for improving exercise capacity in this population.

Main Methods:

  • This study reviews the pathophysiology of single-ventricle circulation post-Fontan.
  • It analyzes central cardiovascular and peripheral factors contributing to exercise impairment.
  • It explores the potential impact of interventions on exercise performance and long-term outcomes.

Main Results:

  • Exercise capacity is demonstrably limited in individuals with Fontan circulation, particularly at peak exertion.
  • This limitation is evident even during sub-maximal activities and worsens with age.
  • Both reduced oxygen delivery (central) and impaired oxygen extraction (peripheral) contribute to exercise intolerance.

Conclusions:

  • The Fontan circulation inherently restricts exercise capacity due to its unique physiology.
  • Interventions targeting cardiac preload and lean muscle mass may offer a strategy to enhance exercise performance.
  • Such interventions could potentially modify the progressive decline in exercise capacity over time.