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Related Experiment Videos

Neuropeptide secretion in exercise.

G N Onuoha1, D P Nicholls, A Patterson

  • 1Department of Cardiology, Royal Victoria Hospital, Belfast, Northern Ireland.

Neuropeptides
|April 2, 1999
PubMed
Summary
This summary is machine-generated.

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Exercise increases atrial natriuretic peptide (ANP) and calcitonin gene-related peptide (CGRP) levels in older adults. BNP levels did not change, suggesting BNP may be a more sensitive indicator of heart dysfunction than ANP.

Area of Science:

  • Cardiovascular Physiology
  • Endocrinology
  • Geriatric Medicine

Background:

  • Atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) are key regulators of fluid balance.
  • The impact of exercise and posture on these peptides, particularly in the elderly, requires further investigation.
  • Calcitonin gene-related peptide (CGRP) is also implicated in cardiovascular regulation.

Purpose of the Study:

  • To examine plasma concentrations of irANP and irBNP in elderly normal subjects during and after treadmill exercise.
  • To determine the effect of steady-state exercise intensity and posture on circulating ANP, BNP, and CGRP levels.
  • To explore the potential roles of natriuretic peptides in fluid balance and kidney function in aging individuals.

Main Methods:

  • Treadmill exercise test (modified Bruce protocol) in 10 elderly subjects (mean age 71.1 years).

Related Experiment Videos

  • Measurements of plasma immunoreactivity for ANP (irANP), BNP (irBNP), and CGRP (irCGRP) at rest, peak exercise, and post-exercise.
  • Assessment of steady-state exercise (30% and 50% intensity) and postural changes (supine vs. sitting) on peptide levels.

    • Main Results:

    • Plasma levels of irANP and irCGRP significantly increased with exercise.
    • Human BNP levels did not show a significant change with exercise.
    • A greater than 40% rise in irCGRP and irANP was observed at 50% compared to 30% steady-state exercise.
    • irCGRP levels declined in the upright position compared to the supine position and did not increase with exercise.
    • BNP concentration may be a more sensitive indicator of left ventricular dysfunction than ANP due to differential release rates.

    Conclusions:

    • Exercise stimulates the release of irANP and irCGRP in elderly individuals.
    • The ANP system may play a role in regulating diuresis, natriuresis, and kidney function in aging subjects.
    • BNP's potential as a more sensitive marker for left ventricular dysfunction warrants further study.