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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

5.3K
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...
5.3K
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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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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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 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...
3.9K
Physiology of the Heart: The Cardiac Cycle01:18

Physiology of the Heart: The Cardiac Cycle

11.7K
The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
Diastole: The Relaxation Phase
During diastole, all four heart chambers relax. The atrioventricular (AV) valves open, and the semilunar valves close. This phase sees the lowest chamber pressures, promoting ventricular filling. Venous blood enters the heart through the...
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Related Experiment Video

Updated: Mar 3, 2026

Author Spotlight: Assessment of Cardiac Output Calculation by Thermodilution in Pigs for Effective Perfusion Flow During EVLP
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Author Spotlight: Assessment of Cardiac Output Calculation by Thermodilution in Pigs for Effective Perfusion Flow During EVLP

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Measuring Cardiac Output during Cardiopulmonary Exercise Testing.

Carlo Vignati1, Gaia Cattadori1,2

  • 11 Heart Failure Unit, Centro Cardiologico Monzino, Istituto di Ricerca Clinica a Carattere Scientifico (IRCCS), Milan, Italy; and.

Annals of the American Thoracic Society
|April 26, 2017
PubMed
Summary

Noninvasive methods now allow direct measurement of cardiac output during exercise, improving cardiac function assessment for heart disease diagnosis and treatment. This offers a significant advancement over older invasive techniques.

Keywords:
cardiac outputcardiopulmonary exercise testingheart disease

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Area of Science:

  • Cardiology
  • Physiology

Background:

  • Cardiac output is crucial for assessing cardiac function and managing heart diseases.
  • Historically, exercise cardiac output measurement relied on impractical invasive methods.
  • Indirect parameters for exercise cardiac output lack significant clinical utility.

Purpose of the Study:

  • To review the advancements in noninvasive cardiac output measurement during exercise.
  • To highlight the clinical significance of accurate cardiac output determination.

Main Methods:

  • Review of noninvasive techniques for cardiac output determination.
  • Comparison with traditional invasive methods.
  • Integration of techniques like transthoracic echocardiography with cardiopulmonary exercise testing.

Main Results:

  • Several noninvasive techniques are now available for direct cardiac output measurement.
  • These methods provide more definitive results compared to indirect surrogates.
  • Noninvasive techniques enhance the understanding of exercise physiopathology.

Conclusions:

  • Noninvasive cardiac output measurement during exercise is now clinically feasible.
  • These advancements improve diagnosis, treatment, and prognostic evaluation of heart conditions.
  • Direct measurement offers better insights into cardiac function during physical exertion.