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J Appl Physiol 90: 2445-2452, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 6, 2445-2452, June 2001

Relationship between body heat content and finger temperature during cold exposure

Dragan Brajkovic, Michel B. Ducharme, and John Frim

Defence and Civil Institute of Environmental Medicine, Toronto, Ontario, Canada M3M 3B9

The purpose of the present experiment was to examine the relationship between rate of body heat storage (S), change in body heat content (Delta Hb), extremity temperatures, and finger dexterity. S, Delta Hb, finger skin temperature (Tfing), toe skin temperature, finger dexterity, and rectal temperature were measured during active torso heating while the subjects sat in a chair and were exposed to -25°C air. S and Delta Hb were measured using partitional calorimetry, rather than thermometry, which was used in the majority of previous studies. Eight men were exposed to four conditions in which the clothing covering the body or the level of torso heating was modified. After 3 h, Tfing was 34.9 ± 0.4, 31.2 ± 1.2, 18.3 ± 3.1, and 12.1 ± 0.5°C for the four conditions, whereas finger dexterity decreased by 0, 0, 26, and 39%, respectively. In contrast to some past studies, extremity comfort can be maintained, despite S that is slightly negative. This study also found a direct linear relationship between Delta Hb and Tfing and toe skin temperature at a negative Delta Hb. In addition, Delta Hb was a better indicator of the relative changes in extremity temperatures and finger dexterity over time than S.

finger dexterity; torso heating; heat storage; heat loss


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