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Supramaximal Intensity Hypoxic Exercise and Vascular Function Assessment in Mice
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Right ventricular function with hypoxic exercise: effects of sildenafil.

Jesper Kjaergaard1, Eric M Snyder, Christian Hassager

  • 1Department of Cardiology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark. jesper.kjaergaard@rh.regionh.dk

European Journal of Applied Physiology
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PubMed
Summary
This summary is machine-generated.

Sildenafil improves right ventricular contractility during hypoxic exercise, maintaining performance similar to normoxia. This effect on contractility appears independent of its impact on pulmonary vascular resistance.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Pharmacology

Background:

  • Sildenafil is known to reduce pulmonary vascular resistance and right ventricular systolic pressure (RVSP) during exercise at high altitudes.
  • The specific impact of sildenafil on right ventricular contractility under hypoxic exercise conditions remains largely unexplored.

Purpose of the Study:

  • To investigate the effects of sildenafil on right ventricular pressure and performance during controlled normobaric hypoxia and maximal exercise.
  • To evaluate changes in right ventricular contractility with sildenafil administration compared to placebo under hypoxic conditions.

Main Methods:

  • A cross-over, double-blind, placebo-controlled trial involving 14 healthy subjects.
  • Measurements included right ventricular systolic pressure (RVSP) via Doppler echocardiography and tricuspid annular isovolumic acceleration (IVA) at rest and during maximal exercise.
  • Subjects were tested in three conditions: normoxia, normobaric hypoxia with placebo, and normobaric hypoxia with 100 mg sildenafil.

Main Results:

  • Hypoxia increased RVSP at rest, which was significantly reduced by sildenafil administration.
  • While hypoxia with placebo blunted the increase in IVA during exercise, sildenafil administration normalized the exercise-induced increase in IVA.
  • Right ventricular contractility, assessed by IVA, was enhanced by sildenafil during hypoxic exercise, reaching levels comparable to normoxic exercise.

Conclusions:

  • Sildenafil administration improves right ventricular contractility during maximal exercise in hypoxia.
  • The enhancement of right ventricular contractility by sildenafil appears to be independent of its effects on RVSP.
  • Sildenafil may be beneficial in maintaining right ventricular function during strenuous activity at high altitudes.