Author/Editor		Kakitsuba, N; Mekjavić, IB
Title		Determining the rate of body heat storage by incorporating body composition
Type		članek
Source		Aviat Space Environ Med
Vol. and No.		Letnik 58, št. 4
Publication year		1987
Volume		str. 301-7
Language		eng
Abstract		The rate of body heat storage (S) is often used as an index of thermal stress. The traditional approach for determining S assumes that the specific heat (Cp) of all body tissues may be averaged to 0.83 kcal X kg-1 X degrees C-1, irrespective of the actual proportion of different tissues in the body. The present theoretical analysis primarily partitions the body into N compartments. However, this analytical approach involves the difficulty of making an exact evaluation of the mass and temperature of multiple compartments. Therefore, by adopting a two-compartment (core and shell) model, the specific heat capacities, mass fractions, and changes in the temperatures of the two compartments are combined, and S is defined as a function of adiposity (= mass fraction of peripheral tissues). Evaluation of a newly developed equation showed close agreement with observations during a series of cold-water immersion trials, and indicated that the new approach seems to adequately predict S as related to body composition.
Descriptors		BODY COMPOSITION BODY TEMPERATURE REGULATION HEAT ADULT BODY SURFACE AREA CALORIMETRY COLD IMMERSION MODELS, BIOLOGICAL RECTUM SKIN TEMPERATURE SKINFOLD THICKNESS