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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.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
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Regulation of Heart Rates01:31

Regulation of Heart Rates

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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).
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...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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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...
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Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...
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Correlation between ECG and Cardiac Cycle01:25

Correlation between ECG and Cardiac Cycle

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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...
14.5K
Decreased pulse rate01:14

Decreased pulse rate

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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.
There are specific risk factors that can elevate the likelihood of developing bradycardia. Advanced age is a significant factor, with...
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Related Experiment Video

Updated: Mar 21, 2026

Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology
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Autonomic Function Following Concussion in Youth Athletes: An Exploration of Heart Rate Variability Using 24-hour Recording Methodology

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Effects on Heart Rate Variability of a European Under-18 Rugby Tournament.

Cristian Solís-Mencía1, Elena Jiménez-Herranz2, Marcelo Cano-Cappellacci3

  • 1Department of Medicine, Faculty of Health Sciences, University of Deusto, Bilbao, Spain.

Journal of Strength and Conditioning Research
|March 19, 2026
PubMed
Summary

Elite under-18 rugby players experience insufficient recovery between matches played every 72 hours. Daily heart rate variability (HRV) monitoring can help manage fatigue and reduce injury risk in young athletes.

Keywords:
autonomiccardiac-parasympatheticelite athletespostmatchrecovery

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Area of Science:

  • Sports Science
  • Physiology
  • Autonomic Nervous System Research

Background:

  • Rugby union involves intense intermittent efforts, demanding significant player recovery.
  • European Under-18 Rugby XV Championship schedules matches every 72 hours, potentially impairing athlete recovery.
  • Heart rate variability (HRV) is an underutilized tool for assessing autonomic nervous system activity and recovery in rugby players.

Purpose of the Study:

  • To evaluate heart rate variability (HRV) responses in elite under-18 rugby players during a European Championship.
  • To investigate the impact of frequent match play (every 72 hours) on player recovery using HRV metrics.

Main Methods:

  • A prospective study involving 27 players from the Spanish under-18 national rugby team.
  • Daily HRV data collection over 12 days, encompassing pre-tournament and three match days.
  • Analysis of time-domain, frequency-domain, and nonlinear HRV metrics using statistical comparisons (Friedman and Wilcoxon tests).

Main Results:

  • No significant HRV differences were found between pre-tournament values and the first match day.
  • Significant decreases in time-domain, frequency-domain, and nonlinear HRV metrics were observed after the first match day compared to subsequent match days.
  • No significant differences in HRV metrics were noted between the second and third match days, indicating persistent fatigue.

Conclusions:

  • Playing rugby matches every 72 hours leads to insufficient recovery and persistent autonomic imbalance in under-18 players.
  • Daily HRV monitoring is a valuable tool for assessing fatigue, managing training load, and mitigating injury risk in young elite rugby players during tournaments.