In the search for the advantage in aerial combat, increasingly higher performance aircraft are being developed that impose ever greater acceleration force loads on the human pilot. The symptomatology associated with increasing +Gz acceleration forces, culminating in Ginduced loss of consciousness caused by the cessation of cerebral blood circulation are described. The inability of the normal cardiovascular system mechanisms to provide adequate circulation to the brain and the eyes, and the resulting associated symptomatology and physiological changes are discussed.
The normal weight, hydrostatic pressure andphysiological ventilation /perfusion gradients in the lungs are exaggerated under high +Gz forces resulting in increasedpulmonary arterio-venous shunting. This causes impairment of circulatory oxygenation and may also result in acceleration inducedatelectasis. The effects of +Gz acceleration forces on the renal system and the limitations of the cervical musculature are also discussed.
This paper serves to describe the human physiological responses to increased +Gz acceleration forces in an attempt to provide a better understanding of the body’s reaction to such demanding physical stressors.
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The author(s) declare there are no affiliations with or involvement in any organisation or entity with any financial interest in the subject matter or materials discussed in this manuscript.
