title: A new approach for detection of leg movement using segmental electrical impedance changes.
abstract: The purpose of this paper is to provide a new approach for detection using bio-impedance. This impedance is measured by the four-electrode method. As the impedance changes resulting from ankle, knee, and hip movements depend on electrode placement, we determined the optimal electrode configurations for these movements by searching for high correlation coefficients, large impedance changes, and minimum interference in ten subjects (age: 20 +/- 4). Our optimal electrode configurations showed very strong relationships between the ankle joint angle and ankle impedance (gamma = - 0.913 +/- 0.03), between the knee joint angle and knee impedance (gamma = 0.944 +/- 0.02), and between the hip joint angle and hip impedance (gamma = 0.823 +/- 0.08). This study showed that lower leg movement could be easily measured by the impedance measurement system with two pairs of skin electrodes.
authors.affiliation: Division of Electronics and Information Engineering, Chonbuk National University, Jeonju 561-756, Korea. cgsong@chonbuk.ac.kr
authors.forename: C-G
authors.initials: CG
authors.lastname: Song
authors.forename: J-H
authors.initials: JH
authors.lastname: Seo
authors.forename: K-S
authors.initials: KS
authors.lastname: Kim
authors.forename: D-Y
authors.initials: DY
authors.lastname: Youn
authors.forename: D Won
authors.initials: DW
authors.lastname: Kim
mesh_terms: D000328:Adult; D000843:Ankle Joint / Q000502:physiology; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D017097:Electric Impedance; D005260:Female; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D007866:Leg / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D010808:Physical Examination / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity