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Related Concept Videos

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...
Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Regulation of Heart Rates01:31

Regulation of Heart Rates

The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
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...
Electrocardiogram01:29

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...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac muscle...

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Related Experiment Video

Updated: Jun 23, 2026

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
08:12

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

Published on: June 5, 2019

Effects of complementary eurythmy therapy on heart rate variability.

Georg Seifert1, Pablo Hernáiz Driever, Kim Pretzer

  • 1Department of Pediatric Oncology and Hematology, Charité-Universitätsmedizin Berlin, Germany. georg.seifert@charite.de

Complementary Therapies in Medicine
|April 29, 2009
PubMed
Summary

Eurythmy therapy (EYT) positively impacts heart rate variability (HRV), unlike conventional ergometer training (CET). EYT promotes relaxation and may benefit patients by improving HRV.

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Last Updated: Jun 23, 2026

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
08:12

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Area of Science:

  • Mind-body medicine
  • Complementary and alternative medicine
  • Physiology

Background:

  • Mind-body therapies are increasingly recognized in oncology.
  • Eurythmy therapy (EYT), a mind-body therapy in Anthroposophic Medicine, may alleviate chronic symptoms and improve quality of life.
  • The physiological mechanisms of EYT are not well understood.

Purpose of the Study:

  • To compare the effects of Eurythmy therapy (EYT) and conventional ergometer training (CET) on heart rate variability (HRV).

Main Methods:

  • A cross-over design study involving 20 healthy subjects.
  • Subjects performed two EYT exercises and two CET sessions.
  • Electrocardiograms (ECGs) were recorded to quantify HRV via very low (VLF), low (LF), and high frequency (HF) oscillations.

Main Results:

  • EYT exercises increased VLF and LF oscillations compared to rest.
  • CET sessions decreased VLF, LF, and HF oscillations compared to rest.
  • The LF/HF ratio, an indicator of autonomic balance, decreased after EYT compared to CET, suggesting improved relaxation.

Conclusions:

  • EYT stimulated HRV, while CET attenuated it at comparable workloads.
  • The observed decrease in the LF/HF ratio post-EYT indicates enhanced relaxation.
  • These findings suggest that EYT may offer benefits for patients through HRV improvement.