Effects of sweat gland training by repeated local heating.

Ogawa, Tokuo; Asayama, Masami; Miyagawa, Toshiaki

doi:10.2170/jjphysiol.32.971

Cited by 39 publications

(22 citation statements)

References 8 publications

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“…The density and capacity of the sweat glands may differ from one body region to another (Sato and Sato, 1983;Shibasaki et al, 1997;Kondo et al, 1998). However, the forearm sweat glands have widely been used to approximate sweating activity of whole body (Wyndham et al, 1964;Wyndham, 1967;Chen & Elizondo, 1974;Ogawa et al, 1982;Kondo et al, 2001). …”

Section: Discussionmentioning

confidence: 99%

“…Although it is widely known that tropical natives maintain suppressed sweating during heat stress (Matsumoto et al, 1993;Ogawa et al, 1993; et , 2002, 2004, 2008Bae et al, 2006), the precise site and nature of the sweat suppression has not been fully established. Experimental evidence has previously shown that peripheral mechanisms play a predominant role, compared to the central nervous system, in the suppression or augmentation of sweating (Collins & Weiner, 1962;Fox et al, 1962;Ogawa et al, 1982). We have hypothesized that suppressed sweating in tropical natives results from the blunted sensitivity of the sweat glands to ACh, because of continuous exposure to the tropical environment.…”

Section: Introductionmentioning

confidence: 94%

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Heat Acclimatization in Hot Summer for Ten Weeks Suppress the Sensitivity of Sweating in Response to Iontophoretically-administered Acetylcholine

Lee

2008

Korean J Physiol Pharmacol

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Heat Acclimatization in Hot Summer for Ten Weeks Suppress the Sensitivity of Sweating in Response to Iontophoretically-administered Acetylcholine

Lee

2008

Korean J Physiol Pharmacol

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“…They consist of secretory ducts and excretory ducts. In the secretory cells of the secretory ducts, precursor sweat is produced, reabsorbs many elements during its passage through the excretory ducts, and is secreted onto the skin surface as sweat (21). In summer when acclimation to heat occurs, reabsorption of major elements in the excretory ducts increases, and therefore the major element concentrations in sweat are low in summer (10).…”

Section: Discussionmentioning

confidence: 99%

“…The sweat samples examined in the present study were collected using arm bags. It was reported that since vapor derived from sweat is saturated in the arm bag worn for a long time, possibly preventing the evaporation of sweat, hydromeiosis is likely to occur (21). Hydromeiosis, which is more likely to occur in summer than in winter due to a larger amount of sweat, would affect the concentration of trace elements in the sweat.…”

Section: Discussionmentioning

confidence: 99%

Seasonal Variation of Trace Element Loss to Sweat during Exercise in Males

Hoshi

Watanabe

Chiba

et al. 2002

Environ. Health Prev. Med.

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Objective: To clarify the seasonal differences of the trace element excretion in sweat, the trace element concentrations in sweat and their loss during exercise were compared between summer and winter.Methods: Sweat samples were collected from ten healthy adult males. Bicycle ergometer exercise was conducted by each subject at a heart rate of 140 beats/min for 1 hour, in summer and in winter. Sweat was collected by the arm bag method.Results: Concentrations of major (Na, K, Ca, and Mg) and trace elements (Zn, Cu, Fe, Ni, Mn, and Cr) in sweat tended to be lower in summer than in winter, and significantly lower concentrations of Mg (p<0.01), Na, Cu, and Mn (p<0.05) were found in summer. The sweat volume in summer (0.90 L) was 1.7-fold larger than that in winter (0.52 L) (p<0.01). The amount of loss of each element to sweat calculated from the concentrations in sweat and sweat volume showed no significant difference between summer and winter.Conclusions: It is suggested that there was no significant difference in the amount of loss of trace elements in sweat due to exercise between summer and winter.

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“…In other words, repetitive rises in brain temperature are considered to play an important role in the attainment of heat acclimation. Sweat glands, however, can be trained by repeated local heating, and this process has been considered to play a substantial role in ehnancement of sweating capacity in association with heat acclimation (Fox et al, 1964;OGAWA et al, 1982). On the other hand, CHEN and ELIzoNDO (1974) maintained that sweat glands could not be trained to increase secretory capacity unless they were heated above the physiological limit.…”

Section: Discussionmentioning

confidence: 99%

Effect of facial cooling during heat acclimation process on adaptive changes in sweating activity.

et al. 1988

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On assumptions that tympanic temperature (1) reflects brain temperature and that the latter can be lowered by cooling of the face, effect of facial cooling during acclimation process on adaptive changes in sweating activity was examined, in comparison with the results of our previous studies on heat acclimation with controlled hyperthermia. Face fanning, by which Tty was clamped at approximately 37.1 °C, was combined with either of the following 9-day acclimation procedures: 90-min heating in a "Sauna box," keeping mean skin temperature slightly above 40°C, or 90-min exercise on a bicycle, clamping rectal temperature (Tre) at approximately 38°C. Each procedure was imposed on the same four male subjects on different occasions, two of whom had participated in our previous experiments. Sweat tests, carried out before and immediately after the completion of the procedure, consisted of measurements of local sweat rates, whole body sweat rate, T1e, and skin temperatures on 5 areas, and of calculations of mean body temperature (Tb) and the rate of sweat expulsions (FSW, as an indicator of central sudomotor activity). No or only a slight increase in sweating activity was observed following the acclimation procedures with face fanning, whereas similar procedures without face fanning had resulted in substantial enhancement of sweating activity in most of the cases, which had been attributed mainly to adaptive changes in central sudomotor activity (as indicated by a shift of the regression line relating FSW to Tb). Similar results were obtained in an additional series of experiments, where the effects of 9-day 90-min exercise in heat, clamping Tre at approximately 38.2°C, with and without facial cooling, were compared with each other in a subject. From the above results it is inferred that Tty reflects brain temperature and that enhancement of sweating activity induced by repeated heat load is strongly impeded, if not accompanied, by an elevation of brain temperature.

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Effects of sweat gland training by repeated local heating.

Abstract: Effects of sweat gland training by daily local heating were examined and its significance in heat acclimatization was evaluated.Training by 2-hr immersion of an arm in hot water of 43°C caused distinct augmentation of sweat gland activity in the trained area, with reduc-

Cited by 39 publications

References 8 publications

Heat Acclimatization in Hot Summer for Ten Weeks Suppress the Sensitivity of Sweating in Response to Iontophoretically-administered Acetylcholine

Heat Acclimatization in Hot Summer for Ten Weeks Suppress the Sensitivity of Sweating in Response to Iontophoretically-administered Acetylcholine

Seasonal Variation of Trace Element Loss to Sweat during Exercise in Males

Effect of facial cooling during heat acclimation process on adaptive changes in sweating activity.

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