PREDICTION OF SEA SURVIVAL TIME

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Authors
  1. Tikuisis, P.
  2. Keefe, A.A.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Despite advances in personal protective equipment and locator technologies, circumstances can lead to life-threatening exposures at sea. Of particular concern is the survival time (ST) when one is immersed in cold water. Estimations of ST are difficult since reliable controlled data are not available. However, studies on accidental immersions are sufficient to begin the construction and calibration of a predictive ST model. The model is based on the cylindrical core-shell concept of heat conduction with internal heat production augmented by shivering. Variables include ambient temperature, clothing protection (with and without leakage), subject characteristics, sea state, and level of immersion. If heat loss exceeds one's maximal rate of heat production, then ST is largely determined by the body's rate of cooling. Conversely, if a heat balance can be established, then ST is dependent on the depletion time of one's energy capacity based on glycogen stores. ST is defined by the deep core temperature reaching 30C. As an example, the predicted ST for a healthy normal sedentary individual immersed in a heavy sea condition at 5C are 1.9, 2.3, 4.8, 12.6, and 24.2 h for nude, short + sweater, shirt + anti-exposure suit, shirt + dry immersion suit, and 4 mm neoprene wet suit conditions, respectively. TRUNCATED
Keywords
Survival time
Report Number
DCIEM-96-R-12 — Technical Report
Date of publication
01 Feb 1996
Number of Pages
26
DSTKIM No
96-01733
CANDIS No
389689
Format(s):
Document Image stored on Optical Disk;Hardcopy

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