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Evaluation of Cardiac Function in Humans Wearing Combat Edge or the Tactical Life Support System when Exposed to +Gz-Acceleration
NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA
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Current and future high performance aircraft operate in an envelope which requires both high altitude and acceleration protection for their aircrew. Such protection includes both positive pressure breathing PPB and an anti-G suit. These factors have been incorporated into a variety of different aircrew clothing ensemble concepts. As part of an ongoing US Navy evaluation of these integrated life support ensembles, 7 subjects 6 male were exposed to acceleration stress in the Naval Air Warfare Center Aircraft Division Warminster human centrifuge while wearing the Combined Advanced Technology Enhanced Design G Ensemble COMBAT EDGE - CE or the Tactical Life Support System TLSS. The following report describes how cardiac function, as measured using impedance cardiography, was effected under Gz-stress will subjects wore these ensembles. It was found that relaxed rapid onset Gz-tolerance without anti-G straining maneuvers was about 1.5 G higher when the subjects wore TLSS as compared to CE. Stroke SI and CI indices both decreased and heart rate rose as Gz-stress was increased regardless of the outfit worn. While the absolute value of these induces were somewhat higher when CE was worn, the relative change in SI and Cl Delta SI, Delta CI, with respect to pre-stress values was smaller with the TLSS ensemble. For both garments, Delta SI and Delta CI was greatest at 6 Gz PBG 24 mmhg. However, TLSS, Delta SI and Delta CI were markedly reduced with PBG levels 30 mmHg 6.5 Gz. Impedance cardiography, Stroke volume, G-Protection, Combat edge, TLSS.
APPROVED FOR PUBLIC RELEASE