著者

鶴岡 典子 河野 隆宏 松永 忠雄 永富 良一 芳賀 洋一

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.54, no.5, pp.207-217, 2016-10-10 (Released:2017-01-14)

参考文献数

20

被引用文献数

1

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Quantitative measurement of sweating rate is a useful indicator of the state of autonomic nerves and related factors such as stress response or body temperature regulation. Specifically, it is known that mental stress increases mental sweating, and deep body temperature and dehydration increase thermal sweating. Therefore, continuous sweat measurement with a small sweating rate meter is expected to be useful for the management of mental stress as well as the prevention of heat stroke. In this study, two small sweating rate meters, one having high resolution and the other having a large dynamic range, were developed and used to measure mental sweating and thermal sweating. These devices determine the sweating rate by the conventional method, which measures the humidity difference between ambient air and air moistened by sweat. Measurement resolution and dynamic range can be adjusted by controlling the air flow rate. The device for measuring mental sweating rate consists of a main body, which has an air pump and two humidity sensors, and a capsule connected to the main body by tubes in which air flows. The device for measuring thermal sweating rate has a pump and two humidity sensors, an aperture instead of a capsule, and a flow channel on a flexible substrate. The mental sweating rates during arithmetic and speech tasks were measured on the plantar aspect of the big toe using the mental sweating rate meter. The present study on part of the sole showed two sweating types ; a reaction type and a low-reaction type. During the mental stress tasks, sweating rate increased by 0.43 mg/min/cm2 compared to that at rest in reaction type subjects, but by less than 0.1 mg/min/cm2 in low-reaction type subjects, showing very low responses to stimulations. The thermal sweating rate during immersion of the lower legs in warm water was measured using the thermal sweating meter worn on the forearm. Sweating rate increased by approximately 0.4 mg/min/cm2 on average due to thermal stress, and was also successfully measured. These results show that the small sweating rate meters developed in this study can be used for measuring mental and thermal sweating rates.

著者

芳賀 洋一 松永 忠雄 牧志 渉

出版者

東北大学

雑誌

萌芽研究

巻号頁・発行日

2006

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1本の光ファイバーを電磁的に2次元スキャンさせ画像を構成する原理を用い、細径かつ解像度の高い医療用内視鏡の実現を目指した。血管内、乳管内、歯周ポケットなどへ挿入し光学的観察を行うことを想定している。外径2mmのポリイミドチューブを基板とし、円筒面上へのフォトリソグラフィーと銅の電解めっきにより2次元駆動のための多層コイルを作製した。円筒状基板へのフォトリソグラフィーは、露光光としてレーザ光をスポットで照射し、基板をステージ制御で動かすレーザ描画で行う。スプレーコーターでレジストを均一な膜厚で塗布し、レーザ描画露光装置を用いてコイル形状をパターニングする。その後レジストを型として電解めっきを行いコイルの作成を行った。光ファイバーを電磁的に駆動し振動させるため、永久磁石を取り付けたコリメートレンズ付き光ファイバーをコイル内に内蔵する。永久磁石は、外径500μm、内径140μm、長さ2mmのFe-Cr-Co系永久磁石を使用した。また、コリメートレンズは外径125μmで長さ790μm、焦点距離750μmのファイバー融着型グリンレンズを使用した。コイルに交流電流を流すと永久磁石の磁気モーメントが磁界と揃うように曲がり光ファイバーを振動させる。X,Yそれぞれの1次元の駆動および、X方向とY方向の位相を90度ずらした状態で正弦波振動させ円を描き、2次元駆動を確認した。