Analysis of the Transient Response of Temporal Artery Blood Flow Data Relative to Various Anti-G Suit Pressure Schedules

摘要

Recent incidences of G-induced loss of consciousness (LOC) by aircrew flying high performance aircraft have reestablished the operational need for increased G-protection for aircrewmen and have prompted a renewed interest in the development of new and improved G-protective equipment and techniques. Of current concern is the rapidity with which these high performance aircraft can achieve high G-levels. This high rate of G-onset creates a period during which the physiological response of the aircrewman and the protective action of his anti-G suit lab behind the G profile, and during which visual symptoms which normally precede LOC and serve to warn the pilot, do not occur. A method is presented for objectively measuring the relative effectiveness of various G protective equipment or techniques by comparing the quantitative response of a subject's mean Doppler flow velocity signal to a series of modest G profiles when using each protective system in turn. The method is applied to evaluate two configurations of the Navy's new servo controlled anti-G valve in comparison with the standard ALAR valve during exposure to G profiles having various rates of G onset.