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Related Experiment Videos

Pulmonary angiotensin-converting enzyme substrate hydrolysis during exercise.

J Dupuis1, C A Goresky, J W Ryan

  • 1McGill University Medical Clinic, Montreal General Hospital, Quebec, Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 1, 1992
PubMed
Summary

Exercise increases lung tissue recruitment and pulmonary vascular surface area. This enhances angiotensin-converting enzyme activity, indicating improved lung function during physical activity.

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Area of Science:

  • Cardiovascular Physiology
  • Pulmonary Circulation
  • Enzyme Kinetics

Background:

  • The angiotensin-converting enzyme (ACE) plays a crucial role in cardiovascular regulation.
  • Understanding how exercise affects ACE activity in the lungs is important for assessing physiological responses.
  • Previous studies have not fully elucidated the relationship between exercise intensity and ACE kinetic parameters in the pulmonary vasculature.

Purpose of the Study:

  • To investigate exercise-induced alterations in the first-order kinetic parameter (Amax/Km) of angiotensin-converting enzyme in the pulmonary circulation.
  • To determine the impact of increasing exercise levels on pulmonary vascular recruitment and lung tissue perfusion.
  • To correlate changes in central blood volume and extravascular lung water with ACE activity during exercise.

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Main Methods:

  • Utilized indicator-dilution techniques with vascular and water space tracers in 10 mongrel dogs.
  • Administered a specific angiotensin-converting enzyme substrate ([3H]BPGP) to measure enzymatic hydrolysis.
  • Monitored changes at rest and during two levels of treadmill exercise, assessing cardiac output and blood volume.

Main Results:

  • Cardiac output and central blood volume increased linearly with exercise intensity.
  • Extravascular lung water reached near-complete lung tissue recruitment asymptotically.
  • Angiotensin-converting enzyme substrate hydrolysis remained constant, but the computed Amax/Km increased linearly with exercise.

Conclusions:

  • Exercise leads to complete recruitment of lung tissue for perfusion.
  • Pulmonary vascular surface area available for substrate hydrolysis expands linearly with increased blood flow during exercise.
  • Pulmonary vascular recruitment continues even after full lung tissue recruitment is achieved, suggesting dynamic adaptation of lung vasculature.