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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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 output averages...
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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 rate...
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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 met...
Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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...
Pulse01:05

Pulse

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 between...

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Related Experiment Video

Updated: Jun 16, 2026

Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure
04:20

Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure

Published on: October 1, 2019

Relation between cardiac dimensions and peak oxygen uptake.

K Steding1, H Engblom, T Buhre

  • 1Department of Clinical Physiology, Lund University Hospital, Lund University, Lund, Sweden.

Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance
|February 4, 2010
PubMed
Summary
This summary is machine-generated.

Total heart volume is a strong predictor of maximal work capacity in both males and females. Endurance training leads to a larger heart with balanced ventricular dimensions, regardless of gender.

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Area of Science:

  • Cardiovascular Physiology
  • Sports Medicine
  • Cardiac Imaging

Background:

  • Endurance training enhances peak oxygen uptake (VO2peak) and cardiac morphology, including left ventricular mass (LVM).
  • The comprehensive relationship between total heart volume (THV) and VO2peak, considering biventricular dimensions across genders, requires further elucidation.
  • Investigating THV's predictive power and ventricular scaling is crucial for understanding exercise-induced cardiac adaptations.

Purpose of the Study:

  • To determine if total heart volume (THV) independently predicts peak oxygen uptake (VO2peak).
  • To assess if left and right ventricular dimensions scale proportionally in response to endurance training across genders.
  • To explore the relationship between cardiac morphology and maximal aerobic capacity.

Main Methods:

  • Cardiovascular magnetic resonance imaging (CMR) and maximal incremental exercise testing were performed on 131 participants (71 athletes, 60 controls).
  • Measurements included total heart volume (THV), left ventricular mass (LVM), and left/right ventricular end-diastolic volumes (LVEDV, RVEDV).
  • Statistical analyses, including multivariable regression, were used to assess predictors of VO2peak and ventricular volume relationships.

Main Results:

  • Total heart volume (THV) was significantly correlated with VO2peak, LVM, LVEDV, and RVEDV in both males and females.
  • Multivariable analysis confirmed THV as a strong, independent predictor of VO2peak (R2 = 0.74, p < 0.001).
  • Left and right ventricular end-diastolic volumes (LVEDV, RVEDV) increased proportionally (R2 = 0.87, p < 0.001) as LVEDV increased, irrespective of gender.

Conclusions:

  • Total heart volume is a robust, independent determinant of maximal aerobic capacity in both sexes.
  • Endurance training is associated with physiological cardiac enlargement, characterized by balanced left and right ventricular growth.
  • These findings highlight the importance of considering overall heart size and biventricular adaptations in athletes.