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Related Concept Videos

Pulse01:05

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...
Regulation of Pulse01:20

Regulation of Pulse

Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
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,...
Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac output averages...
Pulse01:16

Pulse

When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical indicator...
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...

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Related Experiment Video

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Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children
09:45

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children

Published on: April 29, 2013

Relation of heart rate to left ventricular dimensions in normotensive, normal-weight children, adolescents and

G de Simone1, R B Devereux, T R Kimball

  • 1Division of Cardiology, Weill Medical College of Cornell University, New York, NY, USA. simogi@unina.it

Italian Heart Journal : Official Journal of the Italian Federation of Cardiology
|October 2, 2001
PubMed
Summary

Heart rate inversely relates to left ventricular (LV) size and mass in children and adults. This association is influenced by body size, particularly during growth, affecting cardiac dimensions and mass.

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Area of Science:

  • Cardiology
  • Human Physiology
  • Growth and Development

Background:

  • Limited understanding of heart rate's quantitative relationship with body growth and left ventricular (LV) dimensions independent of body size.
  • Previous research has not fully explored these associations across a wide age range.

Purpose of the Study:

  • To investigate the relationship between heart rate, body size, and LV dimensions in children, adolescents, and adults.
  • To determine if these relationships are independent of body size, sex, and race.

Main Methods:

  • Studied 819 healthy individuals (aged 1-85 years) using echocardiography.
  • Measured resting heart rate and LV dimensions (diameter, mass).
  • Analyzed data for correlations with body size, sex, race, and age.

Main Results:

  • In children/adolescents, heart rate decreased with increasing height and weight.
  • In adults, heart rate was higher in women but not related to body size.
  • Heart rate showed an inverse relationship with LV diastolic diameter and LV mass in both age groups, independent of body size, sex, and race.

Conclusions:

  • Heart rate is inversely associated with LV chamber diameter and LV mass in children-adolescents and adults.
  • Body proportions, especially during growth, largely mediate this relationship.
  • Findings highlight the interplay between heart rate, body size, and cardiac structure across the lifespan.