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

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

Research output: Contribution to journalArticleResearchpeer-review

11 Citations (Scopus)

Abstract

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
Volume71
Issue number3
Publication statusPublished - 1 Mar 2000

Keywords

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

Cite this

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abstract = "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.",
keywords = "+Gz, Acceleration, Adapta tion, Baroreflex, Cardiovascular, Impedance cardiography, Peripheral resistance, Postural, Stroke volume, Tilt",
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The effect of baroreflex adaptation on the dynamic cardiovascular response to head-up tilt. / Newman, David G.; White, Saxon W.; Callister, Robin.

In: Aviation Space and Environmental Medicine, Vol. 71, No. 3, 01.03.2000, p. 255-259.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The effect of baroreflex adaptation on the dynamic cardiovascular response to head-up tilt

AU - Newman, David G.

AU - White, Saxon W.

AU - Callister, Robin

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N2 - 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.

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KW - Tilt

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