Effect of thermal environment on water turnover of Japanese children aged 4 to 6 years

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  • 日本人小児4-6歳の体水分の代謝回転に及ぼす温熱環境の影響
  • ニホンジン ショウニ 4 6サイ ノ タイ スイブン ノ タイシャ カイテン ニ オヨボス オンネツ カンキョウ ノ エイキョウ

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This study examined the effect of thermal environment on water turnover (WT) in 86 Japanese children aged 4 to 6 years. We compared WT between 32 children on summer day and 54 on winter day. WT was measured in spring in Miyazaki and from the end of fall to the beginning of winter in Akita prefecture, respectively. Deuterium oxide (99.9%) was administered and the elimination rate (kh) over 6 days was calculated. WT, expressed as a percentage of total body water (%TBW), was calculated as a product of kd and 100. WT (%TBW) was 17% higher on a summer day than on a winter day. This result suggests that thermal environment is among factors which contribute to the individual differences in WT in children.

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