Related Experiment Video
Updated: Jun 17, 2026
08:12
Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
Published on: June 5, 2019
Normal resting electrocardiographic variants in young athletes
1Memorial Hermann Sports Medicine, The University of Texas Medical School at Houston, Houston, TX, 77030, USA. john.p.higgins@uth.tmc.edu.
The Physician and Sportsmedicine
|January 6, 2010
Summary
Recognizing normal electrocardiogram (ECG) variants in young athletes is crucial. This helps prevent unnecessary cardiology referrals and ensures safe exercise clearance, distinguishing benign findings from serious heart conditions.
Area of Science:
- Cardiology
- Sports Medicine
- Pediatrics
Background:
- Sudden cardiac arrest (SCA) in young athletes necessitates thorough pre-participation screening.
- Electrocardiograms (ECGs) are increasingly used in these evaluations.
- Distinguishing normal ECG variants from pathological findings is challenging.
Purpose of the Study:
- To review common normal electrocardiogram variants in children and young adults.
- To aid clinicians in interpreting ECGs during pre-participation examinations.
- To prevent over-referral of athletes for cardiac evaluation.
Main Methods:
- Literature review of studies on ECG findings in young athletes.
- Description of common benign ECG variations.
- Emphasis on differentiating normal variants from disease.
Main Results:
- Certain "abnormal" ECG findings are actually normal variants in healthy young individuals.
- Familiarity with these variants is key for accurate interpretation.
- Early repolarization and athlete's heart are discussed as examples.
Conclusions:
- Accurate identification of normal ECG variants is essential for appropriate pre-participation screening.
- This knowledge supports informed decisions on exercise clearance for young athletes.
- Reduces unnecessary cardiology consultations for benign ECG findings.
Related Concept Videos
01:29Electrocardiogram
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...
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...
01:25ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias
Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...
01:28Electrocardiogram 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...
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...
01:29Dysrhythmias III: Characteristics of Dysrhythmias
Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per minute.
01:19Electrophysiology of Normal Cardiac Rhythm
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 of...
01:18Dysrhythmias IV: Characteristics of Bradyarrhythmias
Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...