Development of thermal-physiological model for blood flow by posture change

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04381
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23020:Architectural environment and building equipment-related
• Research Institution: Tokyo City University
• Principal Investigator: Nagano Hideaki 東京都市大学, 理工学部, 准教授 (50610044)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 温熱快適性 / 血流 / 血圧 / 姿勢 / 重力 / 人体熱もでる / 実験参加者実験

Outline of Final Research Achievements

As a result of participant experiments to consider the effects of different postures in the evaluation of human thermal comfort, which is comfort such as “hot” or “cold,” data were obtained to support the hypothesis that changes in posture can alter blood flow and, in turn, skin temperature. In order to predict this effect with a numerical model, the blood flow determined by the thermal signal was formulated to be affected by gravity in a conventional two-node model divided into body parts by considering the depth-skin as a one-dimensional blood vessel and taking into account all driving forces acting on the blood. The model was formulated so that the blood flow determined by the thermal signal is affected by gravity in the conventional two-node model. This enables the skin temperature to reflect the effect of gravity on the skin temperature due to changes in the posture of the human body.

Free Research Field

建築環境工学

Academic Significance and Societal Importance of the Research Achievements

人体の温熱快適性の評価および予測は、建築内外空間において人が快適かつ健康に過ごすために重要であり、建物や空調システムの設計に際しては重要な項目である。本研究では、対象とする空間において人が過ごす典型的な姿勢によって快適性が異なることを裏付けるものである。たとえば病院の病室であれば仰臥位で過ごす時間が多く、また工場においては立位で過ごす時間が多いと考えられるとき、人体の作業量（代謝量）のみならず姿勢による影響が無視できないのであれば、そのことを考慮することで、空間ごとに適切な快適性評価に基づく空調設計が可能になり、ひいては人々の健康増進に寄与するといえる。