Development of interactive guidance for cold exposure using a thermoregulatory model

Figures & data

Figure 1. Schematic of Six Cylinder Thermoregulatory Model (SCTM).

Figure 2. Interactive Guidance for cold injury prevention cold weather ensemble decision aid (PC version and Mobile version).

Table 1. CoWEDA predicted frostbite time (min), hypothermia time (h) and Wind Chill Index (WCT) frostbite time (min).

		CoWEDA frostbite time (min)									CoWEDA hypothermia time (h)
	T ºCV m/s	2	−9		−21		−32		−43		2	−9	−21	−32	−43
A	2		32		18		14		11			4.2	1.8	1.2	1.0
	11	69	15		10		8		7		22.9	2.3	1.3	0.9	0.7
	20	38	13		9		7		6		20.3	2.0	1.2	0.9	0.7
M	2		33		18		14		11				23.5	7.1	2.9
	11	93	15		11		8		7				20.1	4.5	2.4
	20	39	13		9		7		6			24	19.1	4.0	2.3
		WCT frostbite time (min)
	2							30		10
	11					30		10		5
	20					30		10		5

T: ambient temperature °C, V: wind speed m/s; A: Army Combat Uniform; M: Moderate Cold Weather Ensemble.

Table 2. CoWEDA predicted duration of hand manual performance (min) when wearing the moderate cold weather ensemble.

	No glove: Rest					Glove: Rest					Glove: Exercise
T °C V m/s	2	−9	−21	−32	−43	2	−9	−21	−32	−43	2	−9	−21	−32	−43
2	21	13	10	8	7	150	64	42	32	26			73	42	31
11	12	8	6	5	5	122	56	37	28	23			55	35	27
20	10	7	5	4	4	112	54	36	28	23			52	34	26

T: ambient temperature °C, V: wind speed m/s.

Figure 3. Probability of Survival Decision Aid (PSDA).

Figure 4. Predicted hypothermia survival time for 100 victims during immersion at 0°C, 5°C, 10°C, 15 and 20°C water.