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Table 4 Coefficients for predicting regional variations in glandular density and sweat rates

From: Regional variations in transepidermal water loss, eccrine sweat gland density, sweat secretion rates and electrolyte composition in resting and exercising humans

Site Coefficient A Coefficient B
  Fractional surface area B1: gland density B2: sweat rate (rest) B3: sweat rate (exercise)
Head 0.0743 186 0.489 2.450
Hand (palm) 0.0181 518 0.312 1.461
Hand (dorsal) 0.0283 166 0.495 1.851
Forearm 0.0598 104 0.370 0.927
Upper arm 0.0822 91 0.250 0.606
Axilla 0.0109 84 0.312 0.850
Chest 0.0760 94 0.393 1.403
Abdomen 0.0747 102 0.346 1.053
Back 0.1242 103 0.564 1.658
Buttocks 0.0509 37 0.400 0.553
Thigh 0.1986 69 0.179 0.706
Leg 0.1366 57 0.189 0.886
Foot (sole) 0.0290 497 0.240 0.464
Foot (dorsal) 0.0364 119 0.372 0.932
  1. The coefficients can be used to predict regional variations during resting, passive heating and light-moderate exercise. For passive heating, predictions relate to conditions that elicit a core temperature of 37.2°C (or a 0.6°C elevation above baseline), and a whole-body sweat rate of 0.4 L.h−1. During exercise, the core temperature was 38.8°C (elevation of 2.2°C), external work rate was 125 W and the sweat rate was approximately 1.0 L.h−1. General equation: Body surface area (cm2) × coefficient A (fractional surface area[110]) × coefficient B (site-specific glandular density (B1: glands.cm−2) or sweat rate (B2 or B3: mg.min−1)). Gland densities are from Figure2A. Sweat rates are pooled from data in Figures7 and8 (authors' laboratory). Data for the axilla and buttocks (in both states), and for the forearm, upper arm, thigh and leg during exercise were obtained from the literature. Bilateral predictions include both limbs.