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Related Concept Videos

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...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias 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.
Increased pulse rate01:17

Increased pulse rate

Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
Many factors can elevate the risk of developing tachycardia. These include advanced age, a family history of arrhythmias, and an...
Decreased pulse rate01:14

Decreased pulse rate

Bradycardia is a medical condition in which the heart rate is slower than normal. It occurs when the heart's natural pacemaker, the sinus node, generates slower electrical impulses than the standard rhythm. In adults, bradycardia is diagnosed when the pulse rate falls below 60 beats per minute, indicating a deviation from the normal heart rate range.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with bradycardia...

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Related Experiment Video

Updated: May 16, 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

Heart rate variability today.

Borejda Xhyheri1, Olivia Manfrini, Massimiliano Mazzolini

  • 1Dipartimento di Medicina Specialistica, Diagnostica e Sperimentale. University of Bologna, Bologna, Italy.

Progress in Cardiovascular Diseases
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

Heart rate variability (HRV) assesses autonomic nervous system activity. HRV imbalance links to cardiovascular diseases, but its widespread clinical use for risk stratification requires further establishment.

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Area of Science:

  • Cardiology
  • Autonomic Neuroscience

Background:

  • Heart rate variability (HRV) is a non-invasive method to evaluate autonomic nervous system (ANS) function.
  • Over 30 years, research has linked ANS imbalance, assessed via HRV, to various pathophysiological conditions, especially cardiovascular diseases.
  • Conditions like sudden death, coronary artery disease, heart failure, and risk factors (diabetes, hypertension) are associated with ANS dysfunction.

Purpose of the Study:

  • To explore the role of HRV in assessing autonomic nervous system imbalance.
  • To review the association between HRV and cardiovascular disease.
  • To evaluate the potential of HRV for clinical risk stratification.

Main Methods:

  • Systematic review of studies investigating HRV and cardiovascular health.
  • Analysis of HRV variables for prognostic information.
  • Assessment of the clinical applicability of HRV.

Main Results:

  • HRV analysis provides independent prognostic information.
  • HRV is linked to cardiovascular disease and risk factors.
  • The prognostic value of HRV is recognized.

Conclusions:

  • HRV is a valuable tool for assessing autonomic nervous system activity.
  • HRV holds potential for patient risk stratification in cardiovascular settings.
  • Further validation is needed to establish widespread clinical use of HRV.