Machado-Moreira Christiano A, Caldwell Joanne N, Mekjavic Igor B, Taylor Nigel A S
School of Health Sciences, University of Wollongong, Wollongong, Australia, NSW.
Aviat Space Environ Med. 2008 Nov;79(11):1034-40. doi: 10.3357/asem.2354.2008.
It is generally accepted that the palmar (volar) and dorsal surfaces of human hands display different sudomotor responses to mental or thermal stimuli. We tested the hypothesis that, during thermal stimulation, secretion from the dorsal surfaces would always exceed that from the volar aspect of the hand.
Sweat secretion from 10 hand sites and the forehead was examined (ventilated capsules) in 10 subjects during passive heating (climate chamber: 36 degrees C, 60% relative humidity, water-perfusion suit: 40 degrees C) immediately followed by incremental cycling to volitional fatigue.
This treatment significantly increased core temperature (39.3 degrees C), heart rate (178 bpm), and sweat rate at all sites. Mean sweat secretion during exercise was greater at the forehead (2.90 mg x cm(-2) x min(-1); +/- 0.19) than the hand (1.49 mg x cm(-2) min(-1); +/- 0.27). While no significant differences in sweating were observed among dorsal sites, a nonuniform secretion pattern was observed across the volar surface, with sweating at the palm being the lowest, and that from the volar aspect of the distal phalanges being equivalent to the dorsal hand. These differences became more evident as exercise progressed. Mean hand sweat rate during exercise was 41.7 ml x h(-1), with sweating from the palm accounting for only about 6% of sweat secretion.
Sweat secretion from both the palmar and dorsal surfaces of the hand increases during exercise in the heat, although this occurs in a nonuniform fashion. It is possible that a greater sweat gland density on the fingers may account for variations across the volar surface. However, higher dorsal sweating with lower gland counts (high glandular flow) may be attributable to either larger sweat glands, or to a greater cholinergic sensitivity of these glands.
人们普遍认为，人类手掌（掌侧）和手背对精神或热刺激表现出不同的汗腺运动反应。我们检验了这样一个假设，即在热刺激过程中，手背的汗液分泌量总是超过手掌的汗液分泌量。
对10名受试者的10个手部部位和前额进行汗液分泌检测（使用通风胶囊），在被动加热（气候室：36摄氏度，相对湿度60%，水灌注服：40摄氏度）后立即进行递增式循环运动直至自愿疲劳。
这种处理显著提高了核心体温（39.3摄氏度）、心率（178次/分钟）以及所有部位的出汗率。运动期间前额的平均汗液分泌量（2.90毫克×平方厘米−2×分钟−1；±0.19）大于手部（1.49毫克×平方厘米−2×分钟−1；±0.27）。虽然在手背各部位之间未观察到出汗的显著差异，但在手掌表面观察到分泌模式不均匀，手掌出汗量最低，而远端指骨掌侧的出汗量与手背相当。随着运动的进行，这些差异变得更加明显。运动期间手部平均出汗率为41.7毫升×小时−1，手掌出汗仅占汗液分泌量的约6%。
在热环境中运动时，手掌和手背的汗液分泌都会增加，尽管这种增加方式并不均匀。手指上可能有更高的汗腺密度，这可以解释手掌表面的差异。然而，汗腺数量较少但出汗较多（高腺体流量）可能归因于汗腺较大，或者这些腺体对胆碱能的敏感性更高。
