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Related Concept Videos

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...
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
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...
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...
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...

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Related Experiment Video

Updated: Jun 22, 2026

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
08:10

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation

Published on: July 20, 2022

[Correlation between atrial function and functional capacity in highly trained subjects].

C Christophe1, A Chodek-Hingray, A Pruna

  • 1Département Cardiologie et Maladies Cardiovasculaires, CHU Nancy-Brabois, Vandoeuvre, France. charly_bar@hotmail.com

Annales De Cardiologie Et D'Angeiologie
|May 27, 2009
PubMed
Summary
This summary is machine-generated.

In highly trained athletes, reduced contribution of atrial contraction to left ventricular filling correlates with better exercise capacity. This suggests improved early diastolic filling in the athlete's heart.

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Last Updated: Jun 22, 2026

Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
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A Pacing-Controlled Procedure for the Assessment of Heart Rate-Dependent Diastolic Functions in Murine Heart Failure Models
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A Pacing-Controlled Procedure for the Assessment of Heart Rate-Dependent Diastolic Functions in Murine Heart Failure Models

Published on: July 21, 2023

Area of Science:

  • Cardiology
  • Sports Medicine
  • Echocardiography

Context:

  • Assessing functional capacity in athletes is crucial for performance and health.
  • Tissular Doppler Imaging (TDI) offers insights into myocardial mechanics.
  • Understanding the interplay between cardiac function and exercise performance in athletes is an active area of research.

Purpose:

  • To investigate the relationship between Tissular Doppler Imaging (TDI) parameters and functional capacity in highly trained athletes.
  • To compare myocardial velocity patterns between trained and untrained individuals.

Summary:

  • This study analyzed 46 subjects (24 trained, 22 untrained), measuring longitudinal myocardial velocities (systolic S, diastolic E and A) using pulsed TDI.
  • Cardiopulmonary exercise testing measured peak V(O)2, anaerobic threshold (AT), and VE/V(CO)2 slope in athletes.
  • Key differences observed included the Tei index, LV diastolic diameter, and diastolic A waves. In athletes, atrial contraction (A waves) negatively correlated with V(O)2 and AT, and positively with VE/V(CO)2, indicating better functional capacity with less reliance on atrial filling.

Impact:

  • The findings suggest that in athletes, enhanced early diastolic filling, potentially due to myocardial adaptations in the hypertrophied athlete's heart, leads to better functional capacity.
  • This research provides a deeper understanding of cardiac adaptations to intense training and their functional implications.