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Related Experiment Videos

Effects of venous return on respiratory response.

T Boone1, M Foley

  • 1Anatomy Laboratory, University of Southern Mississippi, Hattiesburg.

The Journal of Sports Medicine and Physical Fitness
|June 1, 1991
PubMed
Summary

Leg lifting increases cardiac output and lung CO2 output in healthy adults. Rapid respiratory responses suggest pulmonary pressoreceptors regulate breathing based on venous return.

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Area of Science:

  • Cardiovascular Physiology
  • Respiratory Physiology
  • Exercise Physiology

Background:

  • Understanding the relationship between cardiac output and respiratory control is crucial for exercise physiology.
  • The role of pulmonary circulation in modulating respiratory reflexes is not fully elucidated.

Purpose of the Study:

  • To investigate the link between CO2 flow to the pulmonary circulation and cardiac output.
  • To examine the impact of increased venous return on respiratory responses.

Main Methods:

  • Thirty healthy young adults performed a leg-lifting maneuver to increase venous return.
  • Cardiac output, CO2 output, and expired ventilation were measured.

Main Results:

  • Leg lifting significantly increased cardiac output and CO2 output.
  • A significant increase in expired ventilation was observed.
  • The ventilatory response was rapid, suggesting a reflex mechanism.

Conclusions:

  • Increased venous return enhances cardiac output and lung CO2 output.
  • Pulmonary pressoreceptors likely mediate rapid respiratory adjustments to changes in venous return.
  • Respiratory responses are dynamically adjusted to match circulatory changes during exercise.

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