Blood Flow through Arteriovenous Anastomoses (AVA) and Regulation of Heat Losses from the Extremities in Human

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  • Hirata Kozo
    Faculty of Home Economics, Kobe Women’s University

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  • 動静脈吻合（AVA）血流と四肢からの熱放散調節
  • ドウ ジョウミャク フンゴウ(AVA)ケツリュウ ト シシ カラ ノ ネツ ホウサン チョウセツ

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The aim of this study was to investigate to what extent venous blood flow from the hand affects evaporative (E) and non-evaporative (R+C) heat losses from the forearm during heat load. Blood flow to and venous flow from the hand were occluded at the wrist for 30 min with cuff (5 cm width) at a pressure of 250 mmHg. Blood circulation in the control hand was not disturbed. After hand vasodilation, forearm skin temperature increased by 3.1℃ on the control side but remained at rest value on the occluded side, with an increased esophageal temperature averaging 0.82℃. Forearm sweat rate at the end of heat load on the control sides was 0.21 units significantly higher than on the occluded side (0.13 units). These results clearly show contributes to the increase in forearm sweat rate and skin temperature after hand vasodilation (mainly through arteriovenous anastomoses: AVA) during heat load.

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