Abstract
The present study investigated the effect of non-uniform skin temperature distribution on thermoregulatory responses and subjective thermal sensation during water immersion. Ten healthy male subjects carried out 60 min water immersion twice, once with uniform (UST) and once with non-uniform (NUST) skin temperature. In UST condition, subjects immersed at 29°C in naked condition, while in NUST condition, subjects immersed at 26°C with partial coverage wetsuit (PCWS). The PCWS covers trunk region, upper arms, and thighs. The non-uniform skin temperature distribution, higher at trunk and lower at distal extremities, was observed in NUST condition. Shivering thermogenesis was not influenced by the skin temperature distribution at the experimental condition of this study. On the other hand, the tissue insulation (I tissue) was significantly higher in NUST condition compared to the UST condition. The increment of I tissue might have been caused by the peripheral vasoconstriction induced by the cold input from the distal extremities in NUST condition. The higher I tissue in NUST condition might lead to the significantly higher esophageal temperature compared to UST condition. No difference was observed in thermal sensation between the two conditions. Subjects felt slightly more comfortable in NUST condition than in UST condition. In conclusion, the non-uniform skin temperature distribution, higher at trunk and lower at distal extremities, might affect the peripheral vasoconstriction to increase the I tissue. On the other hand, shivering thermogenesis and subjective thermal sensation were not affected by the non-uniform skin temperature distribution at the present experimental condition.
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Wakabayashi, H., Kaneda, K., Sato, D. et al. Effect of non-uniform skin temperature on thermoregulatory response during water immersion. Eur J Appl Physiol 104, 175–181 (2008). https://doi.org/10.1007/s00421-008-0714-x
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DOI: https://doi.org/10.1007/s00421-008-0714-x