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Effect of Fine Alteration in Ambient Temperature on Thermal Sweating at Rest and during Exercise under Thermo-neutral Conditions


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Title: Effect of Fine Alteration in Ambient Temperature on Thermal Sweating at Rest and during Exercise under Thermo-neutral Conditions
Authors: Matsumoto, Takaaki / Yamauchi, Masaki / Kosaka, Mitsuo / Nakamura, Koichi
Issue Date: 30-Sep-1989
Publisher: 長崎大学熱帯医学研究所 / Institute of Tropical Medicine, Nagasaki University
Citation: 熱帯医学 Tropical medicine 31(3). p131-139, 1989
Abstract: In order to clarify the influence of ambient temperature on thermal sweating, especially within thermo-neutral temperature, sweat response during resting and exercise were examined by using capacitance hygrometer-sweat capture capsule method. In the resting series, at 25℃ and 28℃, local heat load (43℃ water bath) was applied on the lower legs for 30 min. In the exercise series, at 20℃ and 28℃, 50% of VO_2max bicycle ergometer exercise was carried out for 30 min. Mean skin temperatures before heat load or exercise were 31.68℃, 33.07℃ and 34.09℃ at ambient temperatures of 20℃, 25℃ and 28℃, respectively. Oral temperature at 20℃ was slightly but significantly lower than that at 28℃ (p<0.01). In the resting series, sweat-onset time after heat load was 11.8 min at 25℃ and 4.1 min at 28℃ (p<0.01). Local sweat volume on the chest was 10.26 mg/cm^2 at 25℃ and 22.91 mg/cm^2 at 28℃. In the exercise series, sweat-onset time after the beginning of exercise was 8.5 min at 20℃ and 3.4 min at 28℃ (p<0.01). Local sweat volume on the chest was 33.06 mg/cm^2 at 20℃ and 47.98 mg/cm^2 at 28℃. The study shows that fine displacement of ambient temperature within thermo-neutral temperature significantly affects thermal sweating in thermo-regulation. Significant negative correlations between initial mean skin temperature and sweat-onset time were observed not only during resting but also during exercise. The slope of the regression line during exercise was less steep than that during resting. This indicates that during exercise, non-thermal factors may play an important role on the onset of sweating.
URI: http://hdl.handle.net/10069/4551
ISSN: 03855643
Type: Departmental Bulletin Paper
Appears in Collections:Volume 31, No. 3

Citable URI : http://hdl.handle.net/10069/4551

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