The effect of baroreflex adaptation on the dynamic cardiovascular response to head-up tilt

David G. Newman, Saxon W. White, Robin Callister

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14 Citations (Scopus)


Background: Baroreflex adaptation to repetitive +Gz has been reported previously. The underlying mechanism may involve different responses of stroke volume (SV) and total peripheral resistance (TPR) to +Gz. Hypothesis: The previously observed enhanced mean arterial pressure (MAP) regulation in fighter pilots (FP) is mediated by increases in SV and/or TPR. Methods: There were 8 pilots and 12 non-pilots who underwent head-up tilt. SV was determined using impedance cardiography. Results: MAP increased significantly in FP, due to heart rate (HR) and TPR increasing more and SV decreasing less. Conclusion: Baroreflex adaptation results in better performance of HR, SV and TPR in response to +Gz.

Original languageEnglish
Pages (from-to)255-259
Number of pages5
JournalAviation Space and Environmental Medicine
Issue number3
Publication statusPublished - 1 Mar 2000


  • +Gz
  • Acceleration
  • Adapta tion
  • Baroreflex
  • Cardiovascular
  • Impedance cardiography
  • Peripheral resistance
  • Postural
  • Stroke volume
  • Tilt

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