Coriolis-induced Cutaneous Blood Flow Increase in the Forearm and Calf

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Authors
  1. Cheung, B.
  2. Hofer, K.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
Using venous occlusion plethysmography, Sunahara et al. reported that Coriolis induced nausea was accompanied by an increase in forearm blood flow suggesting a decrease in sympathetic activity to this vascular bed. No significant blood pressure and heart rate changes were observed. Vasodilation of the limbs theoretically impairs orthostatic tolerance, particularly if blood flow is shown to increase simultaneously in the lower limbs. This study examined the latter possibility. Seventeen subjects were exposed to the Coriolis cross coupling effects induced by 20 RPM yaw rotation, and a simultaneous 45 degrees pitch forward head movement in the sagittal plane every 12 seconds. Forearm and calf skin blood flow were monitored in real-time using Laser-Doppler flowmetry (PeriFlux 4001). Our results indicated a significant (p < 0.001) simultaneous forearm and calf skin blood flow increase as a result of Coriolis cross coupling across all 15 susceptible subjects, no significant changes in blood pressure and heart rate were observed. Our results have significant implications on the maintenance of G tolerance in flight when acceleration follows manoeuvres that could provoke the cross coupling effects. Coriolis induced cardiovascular changes may confound previous reports on reduced G tolerance using ground-based centrifuges to simulate negative to positive Gz that invariably evoke cross coupling effects.

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Keywords
Hyperemia;Hypotension
Report Number
DRDC-TORONTO-SL-2000-078 — Scientific Literature
Date of publication
01 Mar 2001
Number of Pages
10
Reprinted from
Brain Research Bulletin, vol 54, no 6, 2001, p 609-618
DSTKIM No
CA023162
CANDIS No
520357
Format(s):
CD ROM

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