A continuous patient activity monitor: Validation and relation to disability

D.J. Walker, P.S. Heslop, C J Plummer, T Essex, Colin Chandler

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The measurement of patient activity over prolonged periods has been attempted with accelerometer-based devices, but these summate total acceleration and deceleration over time periods, are difficult to relate to recognizable activities and are influenced by passive movement. We describe the development of a portable monitor of ambulation. This logs posture (sitting, standing and lying) and number and vigour of steps in real time over prolonged periods, usually 24 h. This is based on a system of position sensors and an accelerometer which is sampled when the subject is standing. Data are processed through an interface and stored on a Psion Series 3 `palm top' computer. The system has been validated against observation, and the relationship of activity to disability in rheumatoid arthritis explored.
Original languageEnglish
Pages (from-to)49-59
JournalPhysiological Measurement
Issue number1
Publication statusPublished - 1997

Keywords / Materials (for Non-textual outputs)

  • monitoring
  • activity
  • disability


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