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Related Concept Videos

Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

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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.
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Regulation of Heart Rates01:31

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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).
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Exercise and Cardiac Output01:17

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Increased pulse rate01:17

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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.
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Disturbances in Heart Rhythm01:29

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Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
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Decreased pulse rate01:14

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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.
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Related Experiment Video

Updated: Apr 16, 2026

Calculating Heart Rate Variability from ECG Data from Youth with Cerebral Palsy During Active Video Game Sessions
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Heart rate variability stabilization in athletes: towards more convenient data acquisition.

Andrew A Flatt1, Michael R Esco1,2

  • 1Human Performance Laboratory, Department of Kinesiology, The University of Alabama, Tuscaloosa, AL, USA.

Clinical Physiology and Functional Imaging
|March 11, 2015
PubMed
Summary

Athletes can now use shorter resting heart rate variability (HRV) recordings. A 1-minute ECG stabilization period is sufficient for accurate lnRMSSD assessment, simplifying training monitoring.

Keywords:
autonomiccardiovascularmonitoringparasympatheticstabilityvagal

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Area of Science:

  • Sports Science
  • Physiology
  • Biomedical Engineering

Background:

  • Resting heart rate variability (HRV) is a valuable tool for monitoring athlete training status.
  • Traditional HRV assessments require lengthy 5-minute stabilization and 5-minute recording periods, limiting practical field application.
  • There is a need for more time-efficient HRV data acquisition methods.

Purpose of the Study:

  • To investigate the stabilization time course of ECG-derived lnRMSSD in athletes.
  • To determine if shorter stabilization periods are adequate for reliable HRV assessment.

Main Methods:

  • Ten-minute ECG recordings were collected from 20 collegiate cross-country athletes (10 male, 10 female).
  • The first 5 minutes were analyzed in successive 1-minute intervals (0-1, 1-2, 2-3, 3-4, 4-5 min).
  • Each 1-minute segment was compared to a 5-10 minute criterion segment (lnRMSSDCriterion) using statistical analysis (ICC, limits of agreement).

Main Results:

  • No significant differences were found between any 1-minute lnRMSSD segment and the criterion measure.
  • Effect sizes were trivial (0.07–0.12), indicating minimal practical difference.
  • Intraclass correlation coefficients (ICC) were near perfect (0.92–0.97), and limits of agreement were narrow (±0.28–0.45 ms).

Conclusions:

  • A 1-minute stabilization period is sufficient for accurate ECG-derived lnRMSSD assessment in athletes.
  • Shorter ECG recording procedures can be implemented, enhancing convenience and compliance for field-based HRV monitoring.
  • This finding supports more practical HRV monitoring strategies for athletes.