Accession Number : AD1002032


Title :   Effects of U.S. Navy Diver Training on Physiological Parameters, Time of Useful Consciousness, and Cognitive Performance During Periods of Normobaric Hypoxia


Descriptive Note : Technical Report,10 Nov 2012,01 May 2014


Corporate Author : Navy Experimental Diving Unit Panama City United States


Personal Author(s) : Haran,F J ; Florian ,John P


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=AD1002032


Report Date : 01 Apr 2014


Pagination or Media Count : 15


Abstract : To investigate if U.S. Navy diver training has an effect on physiological parameters (i.e., heart rate [HR] and SpO2 levels), time of useful consciousness (TUC), and cognitive performance during periods of normobaric hypoxia. Methods: Each subject completed a helmet and aviator mask fitting, SynWin multitask battery training, a normobaric hypoxia symptom familiarization session, and a data collection session which consisted of simulated altitudes of 0 feet above MSL (0k), 18,000 feet (5,486 m) above MSL (18k), and 25,000 feet (7,620 m) above MSL (25k). Three separate two-way multivariate analysis of variance (MANOVA) were run for each simulated altitude with GRP (diver, non-diver) as the between-subjects variable were conducted for SpO2, HR, TUC, and SynWin composite score (SCS) data. Bonferonni corrections were applied as necessary to maintain a family-wise alpha of 0.05. Results: The results of the MANOVAs indicated that USN diver training had no effect on Fg-SpO2, HR, TUC, or SCS for the 0k, 18k, and 25k exposures. Conclusions: There were no significant differences between diver and non-diver physiological parameter measurements, TUC, and cognitive performance during any of the normobaric hypoxic exposures. The results of this study will help to validate the use of a 60% cut-point for SpO2 levels as one input for a physiological based definition of TUC. Future research should focus on developing a model that incorporates a 60% SpO2 cut-point, as well as changes in HR and blood pressure data that are based on the subjects individualized normative data.


Descriptors :   naval personnel , divers , diving , hypoxia , simulation , altitude , heart rate , Consciousness , cognition , Breathing apparatus , pressure , signs and symptoms , naval training


Distribution Statement : APPROVED FOR PUBLIC RELEASE