公开(公告)号：US20250107720A1

公开(公告)日：2025-04-03

申请号：US18833133

申请日：2023-03-01

Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

Inventor： Jin KAWAKITA ,  Takeshi KUROSAWA

IPC: A61B5/024 ,  A61B5/0533

Abstract: A heart rate variability measurement system including: a perspiration detection unit; and a signal arithmetic processing unit. The perspiration detection unit includes: a microdroplet detection unit in which a first thin wire and a second thin wire are disposed in juxtaposition with each other on an insulating substrate; and a perspiration signal output unit that measures a change in an electrical characteristic between the first thin wire and the second thin wire and outputs the change as a perspiration signal. The signal arithmetic processing unit includes: a calculation unit; an information storage unit; and a heart rate variation value output unit, while setting time t, a time lag Δt, a value CH(t) of the perspiration signal at the time t, a heart rate factor Y(t+Δt) indicating heart rate variability at time t+Δt, coefficients a and b, and a predetermined constant as α, the calculation unit calculates Y(t+Δt)=a·X(t)+b and X(t)=CH (t)−CH(t−α).