Pulse Wave Delay for +Gz Tolerance Assessment.
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE
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We have found that pulse wave delay increases linearly with Gz experienced by conscious subjects and that G-tolerance limits as measured using conventional light bars occur repeatedly at the same pulse wave delays or delta delay. When protective modalities such as anti-G suits or supinating seats are used, the delta delays increase at a slower rate as a function of Gz. G-tolerance thresholds occur at higher Gz levels with protection but the delta pulse wave delays reach the same value for all tolerance levels. This parameter can be used to warn expert systems of the approach of GLOC during actual flight andor provides an objective measure of G-protection provided by new or modified anti-G equipment. Therefore, this tool can be used in the research setting to evaluate the efficacy of G-protective equipment in an objective manner. Keywords include Pulse Waves Doppler Flow and Acceleration Tolerance.
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