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Circulatory responses to progressive exercise: insights from positional differences.

T Rowland1, A Garrison, A Delulio

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

International Journal of Sports Medicine
|September 12, 2003
PubMed
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Body position significantly impacts cardiac responses during exercise in boys. Upright cycling initially increases stroke volume by mobilizing leg blood, but cardiac responses become similar in both supine and upright positions at higher intensities.

Area of Science:

  • Pediatric Exercise Physiology
  • Cardiovascular Physiology
  • Sports Medicine

Background:

  • Understanding how body position affects the cardiovascular system during exercise is crucial for interpreting physiological responses in children.
  • Previous research has primarily focused on adult responses, leaving a gap in knowledge regarding pediatric populations.

Purpose of the Study:

  • To investigate the influence of body position (sitting vs. supine) on cardiac responses during progressive exercise in healthy, circumpubertal boys.
  • To compare stroke volume and left ventricular dynamics between supine and upright exercise protocols.

Main Methods:

  • 13 healthy boys (mean age 12.5 years) underwent identical progressive cycle ergometer tests in both supine and sitting positions.
  • Echocardiography (Doppler and 2D) was used to measure stroke volume and left ventricular dimensions.

Related Experiment Videos

  • Cardiac output was calculated based on stroke volume and heart rate.

    • Main Results:

    • At rest, stroke volume and cardiac output were significantly lower in the upright position compared to supine.
    • During supine exercise, stroke volume and left ventricular preload remained unchanged with increasing intensity.
    • Upright exercise led to an initial increase in stroke volume, likely due to lower body blood redistribution, with values becoming comparable to supine exercise at higher intensities.

    Conclusions:

    • Body position influences resting cardiac hemodynamics and the initial response to upright exercise in boys.
    • The mechanisms regulating cardiac output during exercise are largely similar between supine and upright positions once exercise intensity increases.
    • Findings highlight the importance of considering body position in pediatric exercise testing and research.