BIOLOGICAL IMPEDANCE MEASUREMENT METHOD AND MUSCLE FATIGUE EVALUATION METHOD

• Main Authors: SUGIHARA HIROKI, SAKAGAMI YUSUKE
• Format: Patent
• Language: English; Japanese
• Published: 28.09.2023
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; SURGERY

To suppress a measurement error of a biological impedance due to variations in a muscle output.SOLUTION: In a biological impedance measurement method in which at least two electrodes 10, 20 are arranged at a prescribed interval on a living body surface 30, which measures the first voltage V1 generated when connecting a first external resistor Rg1 in parallel between the two electrodes 10, 20 and the second voltage V2 generated when connecting a second external resistor Rg2 in parallel, and calculates a biological impedance Zb between the two electrodes 10, 20 in a muscle portion under the living body surface 30 on the basis of a voltage ratio V1/V2 of the first voltage V1 to the second voltage V2, external stimulation in a prescribed magnitude is applied to the muscle portion at timing synchronized at least with switching between the first external resistor Rg1 and the second external resistor Rg2.SELECTED DRAWING: Figure 2 【課題】筋出力の変動に起因した、生体インピーダンスの測定誤差を抑制する。【解決手段】生体表面３０に、少なくとも２つの電極１０、２０を、所定の間隔を空けて配置し、２つの電極１０、２０間に、第１の外部抵抗Ｒg1を並列接続したときに生じる第１の電圧Ｖ１、及び第２の外部抵抗Ｒg2を並列接続したときに生じる第２の電圧Ｖ２を測定し、第１の電圧Ｖ１及び前記第２の電圧Ｖ２の電圧比Ｖ１／Ｖ２に基づいて、生体表面３０下の筋肉部位における２つの電極１０、２０間の生体インピーダンスＺｂを算出する生体インピーダンス測定方法において、少なくとも第１の外部抵抗Ｒg1及び第２の外部抵抗Ｒg2の間の切り替えと同期するタイミングで、筋肉部位に対して所定の大きさの外部刺激を付与する。【選択図】図２