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Related Experiment Video

Updated: Feb 8, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
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AltitudeOmics: Baroreflex Sensitivity During Acclimatization to 5,260 m.

Nicolas Bourdillon1, Sasan Yazdani2, Andrew W Subudhi3,4

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Baroreflex sensitivity (BRS) decreases with high altitude exposure, worsening with longer stays. This impacts blood pressure control and cardiovascular health during acclimatization.

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Area of Science:

  • Cardiovascular Physiology
  • Altitude Medicine
  • Human Physiology

Background:

  • Baroreflex sensitivity (BRS) is crucial for rapid blood pressure (BP) regulation.
  • Adaptive responses of BRS during high-altitude acclimatization, both at rest and during exercise, remain largely unexplored.

Purpose of the Study:

  • To investigate the changes in BRS during acute and chronic high-altitude exposure.
  • To examine the influence of hypoxia and carbon dioxide levels on BRS at rest and during exercise.

Main Methods:

  • Twenty-one healthy individuals were studied at sea level (SL), and at high altitude on day 1 (ALT1) and day 16 (ALT16).
  • BRS was measured using the sequence method with radial artery catheterization.
  • Resting measurements involved hyperoxic breathing to isolate CO2 chemoreceptors and rebreathing to assess baroreflex response to CO2 increase. Exercise testing involved incremental cycling.

Main Results:

  • Resting BRS significantly decreased at ALT1 and was further reduced at ALT16.
  • The decrease in resting BRS at ALT1 was reversible with inspired CO2, but not at ALT16.
  • Exercise-induced BRS reduction was more pronounced at lower workloads in ALT1 compared to SL, normalizing by ALT16.

Conclusions:

  • This study reveals attenuated BRS in acute hypoxia, exacerbated in chronic hypoxia.
  • Hypocapnia triggered BRS reduction in acute hypoxia, while chemoreceptor resetting contributed in chronic hypoxia.
  • Impaired exercise BRS resetting in acute hypoxia normalized with acclimatization, suggesting improved cardiovascular control over time.