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Related Experiment Videos

Atrial natriuretic factor production during upright exercise.

K F Hossack1, O V Adair, S T Crowley

  • 1Department of Medicine, University of Colorado, Health Sciences Center, Denver.

Cardiology
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Atrial natriuretic factor (ANF) release increases with exercise in healthy men. Atrial wall stress, influenced by heart rate and atrial volume, is significantly related to ANF levels.

Area of Science:

  • Cardiology
  • Physiology

Background:

  • Atrial natriuretic factor (ANF) plays a role in cardiovascular regulation.
  • Factors influencing ANF release in healthy individuals require further elucidation.

Purpose of the Study:

  • To investigate factors associated with atrial natriuretic factor (ANF) release during rest and exercise in normal subjects.

Main Methods:

  • 10 healthy male volunteers underwent measurements at rest (supine, sitting) and during treadmill exercise.
  • Echocardiography assessed atrial volumes; Swan-Ganz catheter measured right atrial and pulmonary artery wedge pressures.
  • Atrial minute circumferential wall stress was calculated using heart rate, atrial volume, and atrial pressure.

Main Results:

  • Right ventricular ANF levels significantly increased from 33 +/- 22 pg/ml at rest to 72 +/- 32 pg/ml at peak exercise (p < 0.001).

Related Experiment Videos

  • A significant relationship was observed between calculated atrial minute circumferential wall stress (both left and right atrial) and ANF levels.
  • An association between norepinephrine and ANF was noted but not significant in multivariate analysis.

    • Conclusions:

    • Atrial natriuretic factor (ANF) release is elevated during exercise in healthy individuals.
    • Atrial minute circumferential wall stress is a key factor associated with ANF release.
    • Norepinephrine's association with ANF is likely indirect, related to heart rate changes.