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Endothelial function does not improve with high-intensity continuous exercise training in SHR: implications of eNOS

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High-intensity exercise did not improve vascular function in hypertensive rats due to increased reactive oxygen species. This suggests exercise intensity is crucial for endothelial health in hypertension.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Hypertension Research

Background:

  • Exercise training enhances vascular endothelial function via nitric oxide (NO) bioavailability.
  • The impact of high-intensity exercise on endothelial function in hypertension remains unclear, with unknown mechanisms.

Purpose of the Study:

  • To investigate the effects of high-intensity exercise on vascular function and the NO pathway in spontaneous hypertensive rats (SHR).
  • To compare high-intensity exercise with moderate-intensity exercise in hypertensive models.

Main Methods:

  • Assessed endothelial function and NO contribution using aortic ring isometric forces in WKY, sedentary SHR, SHR-MOD, and SHR-HI rats.
  • Evaluated endothelial nitric oxide synthase (eNOS) expression and phosphorylation (ser1177) via western blotting.
  • Measured aortic reactive oxygen species (ROS) production using electron paramagnetic resonance.

Main Results:

  • High-intensity exercise increased eNOS levels but did not improve vasorelaxation in SHR-HI, unlike moderate exercise.
  • Increased eNOS-dependent ROS production was observed in SHR-HI aortas.
  • Recoupling or thiol-reducing agents reduced eNOS-dependent ROS, indicating redox-dependent eNOS uncoupling.

Conclusions:

  • High-intensity exercise failed to benefit endothelial function in hypertensive rats.
  • Redox-dependent eNOS uncoupling, leading to increased ROS and decreased NO generation, explains the lack of benefit.