Abstract
The paper provides a new approach for detection using bio-impedance. This impedance is measured by the four-electrode method. As impedance changes resulting from ankle, knee, and hip movements depended heavily on electrode placement, we determined the optimal electrode configurations for those movements by searching for high correlation coefficients, large impedance changes, and minimum interferences in ten subjects (age: 20/spl plusmn/4 years). Our optimal electrode configurations showed very strong relationships between the ankle joint angle and ankle impedance (/spl gamma/= -0.913/spl plusmn/0.03), between the knee joint angle and knee impedance (/spl gamma/= -0.944/spl plusmn/0.02), and between the hip joint angle and hip impedance (/spl gamma/=0.823/spl plusmn/0.08). The study showed the possibility that lower leg movement can be easily measured by an impedance measurement system with two pairs of skin-electrodes.
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