Author(s)

D. Gaffie, A. Guillaume & P. Quandieu

Abstract

Modelling of the cerebrovascular system behavior under +Gz acceleration D. Gai&f, A. Guillaume^ & P. Quandieu& "O.N.E.R.A., Direction de I'Energetique 29, avenue de la Division Leclerc, 92320 Chatillon, France ** Centre d'Etudes et de Recherche de Medecine Aerospatiale, Base d'Essais en Vol, 91228 Bretigny sur Orge, France INTRODUCTION During steep turns fighterpilots are exposed to a centrifugal force exerting itself in the axis head-seat, along the large blood vessels ([9], [10], [11]). In the aviation environment these conditions of hypergravity are described as +Gz acceleration. They can sometimes be notious and induce inflight loss of consciousness (LOG). In the case of gradual onset rate (GOR) accelerations the commonly incriminated pathophysiology is cerebral hypoxia. The blood mass is shifted to the lower part of the body and pools in the lower limb venous system due to the great distensibility of veins. This phenomenon results in

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