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Acute and chronic changes in baroreflex sensitivity in hypobaric vs. normobaric hypoxia.

Nicolas Bourdillon1, Jonas Saugy2, Laurent Schmitt2,3

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Summary

Normobaric hypoxia (NH) and hypobaric hypoxia (HH) similarly decrease baroreflex sensitivity (BRS) acutely and chronically. This BRS reduction persists after exposure, with no significant difference between NH and HH conditions.

Keywords:
AltitudeBaroreflexHypobaric hypoxiaLHTLNormobaric hypoxia

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Area of Science:

  • Physiology
  • Altitude Medicine
  • Cardiovascular Regulation

Background:

  • Normobaric hypoxia (NH) is often used to simulate hypobaric hypoxia (HH) found at altitude.
  • Previous research suggests physiological differences between NH and HH.
  • Baroreflex sensitivity (BRS) is known to decrease with altitude exposure and intense training.

Purpose of the Study:

  • To compare acute and chronic changes in BRS under normobaric hypoxia (NH) versus hypobaric hypoxia (HH).
  • To investigate if simulated altitude (NH) elicits the same BRS response as real altitude (HH).

Main Methods:

  • BRS was measured in healthy males after 20 hours at 3450m in NH vs. HH (Study 1).
  • BRS was assessed in athletes after 18 days of live-high train-low (LHTL) at 2250m in NH vs. HH (Study 2).

Main Results:

  • BRS significantly decreased (p<0.05) in both NH and HH conditions after acute and chronic exposures.
  • The magnitude of BRS decrease was similar between NH and HH for both study durations.
  • The observed decrease in BRS persisted after the cessation of hypoxic exposure, with no difference between NH and HH.

Conclusions:

  • Both NH and HH similarly reduce BRS acutely and chronically.
  • The physiological differences between NH and HH are not sufficient to cause distinct BRS responses.
  • Altitude exposure leads to a persistent decrease in BRS, regardless of whether it is experienced under normobaric or hypobaric conditions.