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Publication AbstractsThe Effect of Baroreflex Adaptation on the Dynamic Cardiovascular Response to Head-Up TiltDavid G. Newman, M.B., B.S., D.Av.Med., Saxon W. White, M.D., FRACS, and Robin Callister, M.Sc., Ph.D.Aviat Space Environ Med 2000; 71:255-9 AbstractBackground: 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: stroke volume, peripheral resistance, impedance cardiography, +Gz, tilt, postural, acceleration, baroreflex, cardiovascular, adaptation. Information on subscribing, and on obtaining copies of an article or of an entire issue. Table of Contents for Volume 71, Number 3 of the ASME journal.
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