Sweaty hands: differences in sweat secretion from palmar and dorsal surfaces
The hand is one of the most closely studied body segments with respect to sweat secretion, with previous research focussing on its neural control, secretion differences between glabrous and non-glabrous (hairy) skin surfaces, and upon the impact of thermal and non-thermal stimuli on sudomotor function. It is generally considered that the glabrous palmar surfaces are adrenergically activated during times of mental or emotional stress, while the non-glabrous dorsal surfaces are cholinergically innervated, and respond to thermal stimuli (Wolf and Maibach, 1974). However, surprisingly little is known concerning the regional distribution of sweating within the palmar and dorsal surfaces of the hand. Therefore, in this project, we investigated the distribution of sweating within the hand, and measured sweat rates from ten sites on the dorsal and palmar surfaces during mild hyperthermia.