Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

3.2K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
3.2K
Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

8.4K
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...
8.4K
Cardiac Action Potential01:30

Cardiac Action Potential

2.6K
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
2.6K
Electrophysiology of Normal Cardiac Rhythm01:19

Electrophysiology of Normal Cardiac Rhythm

6.8K
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
6.8K
Imaging Studies for Cardiovascular System I:Echocardiography01:17

Imaging Studies for Cardiovascular System I:Echocardiography

492
Cardiac imaging studies encompass a wide range of noninvasive and minimally invasive techniques designed to visualize the heart's structure and function in detail. One such technique is echocardiography, which uses high-frequency ultrasound waves to produce detailed images of the heart, known as echocardiograms.
Indications: Echocardiography is utilized to diagnose heart failure, valve disorders, and myocardial infarction. It also assesses cardiac structures' size, shape, and motion,...
492
Exercise Stress Test01:26

Exercise Stress Test

502
Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
502

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Association of Relative Pericoronary Adipose Tissue Attenuation with Coronary Artery Calcification Severity.

Medicina (Kaunas, Lithuania)·2026
Same author

Microbiome-Associated Drug Response Variability in Heart Failure Treatment.

Life (Basel, Switzerland)·2026
Same author

Clinical Outcomes and Predictors of Response to Levodopa-Entacapone-Carbidopa Intestinal Gel in Advanced Parkinson's Disease: A Retrospective Cohort Study over a 4-Year Period.

Pharmaceutics·2026
Same author

Occurrence data for stream-dwelling macroinvertebrates from Central Europe.

Data in brief·2025
Same author

Clinicopathological Parameters and Immunohistochemical Profiles in Correlation with MRI Characteristics in Glioblastomas.

International journal of molecular sciences·2024
Same author

Biomarker Profiles and Clinicopathological Features in Head and Neck Squamous Cell Carcinoma Patients.

Medicina (Kaunas, Lithuania)·2024

Related Experiment Video

Updated: Sep 13, 2025

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
11:50

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

Published on: July 9, 2010

24.3K

Dynamic Echocardiographic Changes Induced by Exercise in Healthy, Young Individuals with Early Repolarization

Loránd Kocsis1, Zsuzsanna Pap2, István Adorján Szabó3

  • 1Doctoral School of Medicine and Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science and Technology of Targu Mures, 540142 Targu Mures, Romania.

Diagnostics (Basel, Switzerland)
|July 29, 2025
PubMed
Summary

Early repolarization pattern (ERP) in healthy males doesn't cause heart abnormalities. However, exercise reveals distinct volumetric changes in ERP individuals, suggesting subtle hemodynamic adaptations.

Keywords:
arrhythmiaearly repolarizationechocardiographyexercise test

More Related Videos

Real-Time Electrocardiogram Monitoring During Treadmill Training in Mice
04:45

Real-Time Electrocardiogram Monitoring During Treadmill Training in Mice

Published on: May 5, 2022

2.6K
Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
06:34

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

Published on: October 28, 2020

4.1K

Related Experiment Videos

Last Updated: Sep 13, 2025

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart
11:50

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

Published on: July 9, 2010

24.3K
Real-Time Electrocardiogram Monitoring During Treadmill Training in Mice
04:45

Real-Time Electrocardiogram Monitoring During Treadmill Training in Mice

Published on: May 5, 2022

2.6K
Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
06:34

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

Published on: October 28, 2020

4.1K

Area of Science:

  • Cardiology
  • Exercise Physiology
  • Electrophysiology

Background:

  • Early repolarization pattern (ERP) on electrocardiography (ECG) is linked to ventricular arrhythmia risk.
  • The influence of ERP on hemodynamic responses during exercise remains unclear.

Purpose of the Study:

  • To assess exercise effects on echocardiographic parameters in individuals with and without ERP.
  • To explore potential ERP influence on hemodynamic adaptation to physical stress.

Main Methods:

  • Compared 25 young males with ERP (ERP+) and 25 without (ERP-) using transthoracic echocardiography.
  • Echocardiography performed at rest and during early recovery after treadmill exercise.
  • Analyzed conventional and strain-derived echocardiographic parameters for baseline and exercise-induced changes.

Main Results:

  • Both groups showed similar cardiovascular fitness and responses to exercise.
  • No significant structural or functional abnormalities were found at rest or during recovery.
  • ERP+ individuals exhibited greater reductions in left ventricular end-diastolic and stroke volumes post-exercise.

Conclusions:

  • Early repolarization pattern is not associated with structural cardiac issues or overt dysfunction in young males.
  • Exercise-induced volumetric changes in ERP+ individuals suggest unique hemodynamic adaptations.
  • Further research is needed to understand these subtle hemodynamic differences.