PROBLEM TO BE SOLVED: To evaluate contact pressure acting on a body from an electrode portion by a simple structure.SOLUTION: The electrode portion 14 includes an electrode pair PA (electrode E1 and electrode E2) coming into contact with a measurement region of a subject and an electrode pair PB (electrode E3 and electrode E4). A control portion 22 computes impedance ZA[n] by a two-electrode method using the electrode pair PA and computes impedance ZB[n] by a four-electrode method using the electrode pair PA and the electrode pair PB, and computes a contact pressure index C[n] of the electrode portion 14 relative to the measurement region on the basis of a difference between the impedance ZA[n] and the impedance ZB[n].COPYRIGHT: (C)2012,JPO&INPIT【課題】電極部から身体に作用する接触圧を簡易な構成で評価する。【解決手段】電極部14は、被験者の測定部位に接触する電極対PA(電極E1,電極E2)および電極対PB(電極E3,電極E4)を含む。制御部22は、電極対PAを利用した2電極法でインピーダンスZA[n]を算定するとともに、電極対PAと電極対PBとを利用した4電極法でインピーダンスZB[n]を算定し、測定部位に対する電極部14の接触圧に応じた接触圧指標C[n]をインピーダンスZA[n]とインピーダンスZB[n]との差分に基づいて算定する。【選択図】図2
