A Posture monitoring algorithm using a 3 axis acceleration sensor.

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  • ３軸加速度センサーによる姿勢検出アルゴリズムの改良と実用性の検討

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A Posture monitoring algorithm using a 3 axis acceleration sensor. Detection of change in the posture of a patient with an implanted pacemaker provides a useful means for diagnosing and treating fainting caused by hemodynamic changes relating to patients' postures. We conducted a study using a 3-axis acceleration sensor, built into a pacemaker. To obtain the variation and detect the change of posture, we twice integrated the absolute values of the vector of the acceleration generated by a movement. But this algorithm easily produces error caused by the integration of even a small noise or offset of the sensor. This resulted in a low detection rate. Therefore we modified this algorithm along more practical lines so as to detect the postural changes. We subtracted the gravity component using a filter rather than constant value. We limited the integration interval to a period of body movement and compensated for kinetic acceleration using centrifugal force from the rotating motion of the body that accompanies posture change. We recorded acceleration during posture changes from sitting to standing and standing to sitting in 13 subjects. The algorithm detected posture changes by the double integration of acceleration signal with a 92% recognition rate from a total of 474 postural changes. This algorithm generated stable detection.

Journal

  • Jinko Zoki

    Jinko Zoki 28 (1), 78-82, 1999

    JAPANESE SOCIETY FOR ARTIFICIAL ORGANS

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