Finger cooling by contact with cold aluminium surfaces--effects of pressure, mass and whole body thermal balance.
Finger skin temperature change during contact with a cold aluminium surface was studied in 20 subjects (10 men and 10 women). Contact pressure (0.1 N, 5.9 N and 9.8 N), contact material mass (large one, mass 3559 g, small one, mass 108 g), surface temperatures (-7 degrees C, 0 degree C, +7 degrees C) and whole body thermal balance were controlled as independent factors. The contact experiments were performed in a small chamber and only the first section of the index finger of the left hand was in contact with the aluminium surface. The results indicated that all the factors studied had significant effects on the contact skin temperature change with time. The study confirmed that a modified Newtonian model with two components can accurately describe the contact skin temperature change with time. The study resulted in three predictive models for critical skin temperature when in contact with cold aluminium. The results indicated that metal surfaces in contact with bare hands should not be below 4 degrees C surface temperature. Lower temperatures require insulating material or the wearing of protective gloves.
Department of Work and Environmental Physiology, National Institute of Occupational Health, Solna, Sweden.
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Chen
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Nilsson
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Holmér
D000328:Adult; D001833:Body Temperature Regulation; D003080:Cold Temperature; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D008433:Mathematics; D011312:Pressure; D012881:Skin Temperature / Q000502:physiology*