The thermoregulatory responses before and after the onset of sweating when wearing undershirts of different moisture absorption

Ishii Tomoko, Nakajima (Kamiji) Ayumi, Hirata Kozo

doi:10.11227/seikisho.46.3

The purpose of this study was to make clear influence on thermoregulatory responses of the body while wearing two types of undershirts differing in moisture absorption by two percent, in the before and after the onset of sweating. Seven female subjects wore long-sleeved undershirts of circular knitting Polyester (P: moisture absorption 0.6%) or a circular knitting Cupro/Polyester mixtured (C: moisture absorption 2.6%) and kept at seated rest. The ambient temperature was changed to 26°, 20° and 35°C over 240 minutes. The results show, skin blood flow was significantly lower in C than that in P before the onset of sweating, and was significantly higher in C after the onset of sweating (p<0.05). The difference between C and P (C-P) in mean skin temperature was −0.52±0.33°C before the onset of sweating. After the onset of sweating, the difference became −0.03±0.16°C, significantly rose by 0.49°C (p<0.05). Local skin temperatures also rose after the onset of sweating. It is inferred that these changes was influenced by the facilitation of vaporization from skin and of heat of sorption from the undershirts due to higher moisture absorption in C, before and after the onset of sweating, respectively. It is clear that the influences of difference in moisture absorption between P and C on skin blood flow and temperature were differed before and after the onset of sweating.<br>

The thermoregulatory responses before and after the onset of sweating when wearing undershirts of different moisture absorption

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