Effect of Patient Weight as a Factor During Use of an Immobilization System versus No Immobilization System
Technical Report,09 May 2019,04 Nov 2019
ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL FORT RUCKER United States
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This goal of this study was to evaluate the effect of patient weight as a factor when using an immobilization system versus no immobilization system litter only during patient transport. The hypothesis that patients with different weights produce different biodynamic responses was tested under two immobilization conditions 1 immobilized with a U.S. Army Immobilization Kit while secured to a U.S. Army Decontaminable Litter with standard litter straps, and 2 non-immobilized where subjects were simply secured to the Decontaminable Litter with two litter straps. Subjects were divided into high- and low-weight groups. High-weight subjects were those who weighed 190 to 240 pounds lb. and low-weight subjects were those who weighed 110 to 150 lb. Accelerometers were placed on each subjects forehead, sternum, pelvis, and knee, as well as the input surface litter mesh or spine board and Multi-Axis Ride Simulator MARS platform surface. The subjects were placed in the immobilized and non-immobilized configurations ON THE mars, then ride signatures of a Mine-Resistant Ambush Protected ground vehicle, HH-60M helicopter, and constructed white-noise vibration profile were simulated. Significant differences were found between weight groups andz-axis transmissibility, area under z-axis transmissibility curve, z-axis transmissibility resonance frequency, root mean square RMS z-axis acceleration, and RMS rotational velocity.
- Military Aircraft Operations
- Anatomy and Physiology