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Related Concept Videos

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Related Experiment Video

Updated: Jul 3, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

Cardiovascular drift in euhydrated prepubertal boys.

Thomas Rowland1, David Pober, Anne Garrison

  • 1Department of Pediatrics, Baystate Medical Center, Springfield, MA 01199, USA. thomas.rowland@bhs.org

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquee, Nutrition Et Metabolisme
|July 22, 2008
PubMed
Summary

Cardiovascular drift in young boys, when hydrated, shows stable stroke volume and rising cardiac output, similar to adults. This indicates cardiovascular drift reflects aerobic changes, not dehydration effects.

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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

Related Experiment Videos

Last Updated: Jul 3, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

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:

  • Exercise Physiology
  • Pediatric Sports Medicine
  • Cardiovascular Regulation

Background:

  • "Classic" cardiovascular drift involves decreased stroke volume and mean arterial pressure during sustained exercise.
  • Recent adult studies suggest hydration prevents this pattern, showing stable stroke volume and increased cardiac output.
  • The influence of hydration on cardiovascular drift in prepubertal children remains unclear.

Purpose of the Study:

  • To investigate the effect of hydration on cardiovascular drift in prepubertal boys.
  • To examine the relationship between cardiovascular drift and aerobic drift (changes in VO2).
  • To compare cardiovascular drift patterns in prepubertal boys with those in young adult men.

Main Methods:

  • Eight prepubertal boys (Tanner stage 1) performed constant-load cycling to exhaustion.
  • Cardiovascular variables (heart rate, stroke volume, cardiac output, blood pressure) and VO2 were measured.
  • Body core temperature was monitored using rectal thermistors.

Main Results:

  • During exercise, heart rate and cardiac output increased, while systemic vascular resistance decreased.
  • Stroke volume remained stable throughout the exercise bout.
  • Increases in cardiac output were directly related to increases in VO2, with no change in the arterial venous oxygen difference.

Conclusions:

  • Cardiovascular drift in hydrated prepubertal boys is characterized by stable stroke volume and rising cardiac output, mirroring adult responses.
  • Cardiovascular drift appears to reflect aerobic drift, a relationship masked by dehydration in previous studies.
  • Cardiovascular drift patterns in prepubertal boys are similar to those observed in young adult men.