Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Electrocardiogram

Electrocardiogram

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 the T...

Electrocardiogram Fundamentals

Electrocardiogram Fundamentals

Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin to...

ECG Interpretation of Rhythms

ECG Interpretation of Rhythms

An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage. When...

Exercise Stress Test

Exercise Stress Test

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

Correlation between ECG and Cardiac Cycle

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...

Cardiopulmonary Resuscitation III: AED Use

Cardiopulmonary Resuscitation III: AED Use

Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...

You might also read

Related Articles

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

Sort by

Same author

Impact of expectation, catastrophizing, and self-compassion on labour pain experiences among Portuguese women.

Journal of reproductive and infant psychology·2025

Same author

Dhvar5-chitosan nanogels and their potential to improve antibiotics activity.

International journal of biological macromolecules·2024

Same author

Heart rate variability in patients with refractory epilepsy: The influence of generalized convulsive seizures.

Epilepsy research·2021

Same author

Training responsiveness of cardiorespiratory fitness and arterial stiffness following moderate-intensity continuous training and high-intensity interval training in adults with intellectual and developmental disabilities.

Journal of intellectual disability research : JIDR·2021

Same author

Lactation curve model with explicit representation of perturbations as a phenotyping tool for dairy livestock precision farming.

Animal : an international journal of animal bioscience·2021

Same author

Do basic auscultation skills need to be resuscitated? A new strategy for improving competency among nursing students.

Nurse education today·2020

Search research articles

Related Experiment Video

Updated: May 25, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Associating ECG features with firefighter's activities.

J Pallauf¹, P Gomes, S Brás

¹Department of Computer Science, Faculdade de Ciências, Instituto de Telecomunicações, Universidade do Porto, Portugal. johannes.pallauf@mytum.de

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

This summary is machine-generated.

Electrocardiogram (ECG) features correlate with firefighter stress levels during real-world events. This study links heart rate and variability data to perceived stress, offering insights into occupational health.

More Related Videos

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions

Published on: June 5, 2019

Electroencephalographic, Heart Rate, and Galvanic Skin Response Assessment for an Advertising Perception Study: Application to Antismoking Public Service Announcements

Electroencephalographic, Heart Rate, and Galvanic Skin Response Assessment for an Advertising Perception Study: Application to Antismoking Public Service Announcements

Published on: August 28, 2017

Related Experiment Videos

Last Updated: May 25, 2026

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Real-Time Cardiac Mapping with a Noninvasive Imageless Electrocardiographic Imaging System

Published on: April 11, 2025

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions

Published on: June 5, 2019

Electroencephalographic, Heart Rate, and Galvanic Skin Response Assessment for an Advertising Perception Study: Application to Antismoking Public Service Announcements

Electroencephalographic, Heart Rate, and Galvanic Skin Response Assessment for an Advertising Perception Study: Application to Antismoking Public Service Announcements

Published on: August 28, 2017

Area of Science:

Occupational Health
Biomedical Engineering
Cardiology

Background:

Firefighters experience high stress in critical situations like fires and accidents.
Monitoring physiological responses can objectively assess stress levels.
Electrocardiogram (ECG) signals offer valuable data on cardiovascular changes.

Purpose of the Study:

To associate ECG signal features with perceived stress levels in firefighters during actual emergency events.
To investigate the relationship between heart rate and heart rate variability and firefighter stress.
To explore inter-individual differences in physiological stress responses.

Main Methods:

Collected ECG data from five firefighters using wearable technology during various emergency events.
Analyzed heart rate and heart rate variability features in 5-minute intervals.
Used a questionnaire to rank event-related stress and fatigue, comparing it with ECG data via association measures.

Main Results:

Found significant associations between perceived stress rankings and time-domain heart rate (HR) and heart rate variability (HRV) features.
Demonstrated that ECG-derived metrics can reflect the stress experienced by firefighters.
Highlighted variations in personal responses to stressful occupational scenarios.

Conclusions:

ECG analysis, specifically HR and HRV metrics, can serve as an objective indicator of stress in firefighters.
This research provides a foundation for developing better stress monitoring tools for high-risk professions.
Further investigation is needed to understand individual stress response patterns and optimize interventions.