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Related Concept Videos

Autonomic Nervous System01:22

Autonomic Nervous System

The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
The ANS comprises two main divisions: the sympathetic and parasympathetic divisions. These divisions function antagonistically to maintain a dynamic...
Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
The Parasympathetic Nervous System01:14

The Parasympathetic Nervous System

Overview
Parasympathetic Division of the ANS01:08

Parasympathetic Division of the ANS

The parasympathetic division of the autonomic nervous system (ANS) regulates rest and digestion functions in the body. It works in opposition to the sympathetic division, promoting relaxation, conservation of energy, and digestion. The parasympathetic division consists of preganglionic fibers originating from specific cranial nerves (III, VII, IX, X) and the sacral spinal nerves (S2-S4). These fibers synapse with postganglionic neurons in the terminal ganglia, innervating various organs and...
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation01:21

Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation

Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...

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Related Experiment Video

Updated: May 17, 2026

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Toddlers - Resting and Developmental Challenges
08:22

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Toddlers - Resting and Developmental Challenges

Published on: February 25, 2016

Postprandial cardiac autonomic function in Prader-Willi syndrome.

Louise Purtell1, Arthur Jenkins, Alexander Viardot

  • 1Diabetes & Obesity Research Program, Garvan Institute of Medical Research, Sydney-Darlinghurst, NSW, Australia. l.purtell@garvan.org.au

Clinical Endocrinology
|October 31, 2012
PubMed
Summary

Adults with Prader-Willi syndrome (PWS) show impaired autonomic nervous system (ANS) responses after meals. This reduced heart rate variability (HRV) may explain their high cardiovascular risk and obesity.

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Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children
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Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children

Published on: April 29, 2013

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Last Updated: May 17, 2026

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Toddlers - Resting and Developmental Challenges
08:22

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Toddlers - Resting and Developmental Challenges

Published on: February 25, 2016

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

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function
  • Metabolic Syndrome Research

Background:

  • Prader-Willi syndrome (PWS) is associated with elevated cardiovascular risk, yet the underlying mechanisms remain poorly understood.
  • Autonomic nervous system (ANS) dysfunction is a potential contributor to the cardiovascular complications observed in PWS.
  • Understanding ANS function in PWS is crucial for developing targeted interventions.

Purpose of the Study:

  • To evaluate cardiac autonomic function in adults with PWS by measuring postprandial heart rate variability (HRV) and arterial stiffness.
  • To compare ANS responses to a meal in adults with PWS against healthy obese and lean individuals.
  • To investigate the potential link between impaired ANS function and cardiovascular risk in PWS.

Main Methods:

  • A comparative study involving 10 adults with PWS, 11 matched obese controls, and 9 lean controls.
  • Continuous electrocardiographic (ECG) monitoring and arterial stiffness measurements were recorded for 10 minutes at specified intervals up to 240 minutes post-meal.
  • Frequency domain analysis (Fast Fourier Transform) was used to assess power spectral density, including low-frequency (LF) and high-frequency (HF) HRV components.

Main Results:

  • Adults with PWS exhibited a significantly reduced low-frequency (LF) heart rate variability (HRV) response following a meal compared to obese controls.
  • No significant differences were observed in high-frequency (HF) HRV, LF/HF ratio, heart rate, total power, or arterial stiffness meal responses among the groups.
  • These findings indicate a specific impairment in postprandial autonomic regulation in individuals with PWS.

Conclusions:

  • The study suggests that adults with Prader-Willi syndrome experience impaired postprandial autonomic nervous system (ANS) responsiveness.
  • This diminished ANS responsiveness, particularly reduced LF HRV, may be a key factor contributing to the increased cardiovascular risk and obesity prevalent in PWS.
  • Further research is warranted to explore therapeutic strategies targeting ANS function in PWS management.