Body-worn sensor based surrogates of minimum ground clearance in elderly fallers and controls

Annu Int Conf IEEE Eng Med Biol Soc. 2011:2011:6499-502. doi: 10.1109/IEMBS.2011.6091732.

Abstract

Falls in the elderly are a major problem worldwide with enormous associated economic and societal costs. Minimum ground clearance (MGC) is an important gait variable when considering trip-related falls risk. This study aimed to investigate the clinical relevance of inertial sensor derived parameters, previously shown to be related to MGC. Previous research by the authors reported a surrogate method for assessing minimum ground clearance (MGC) using shank-mounted inertial sensors in young controls. The present study tests this method on a cohort of 114 community dwelling elderly adults, with and without a history of falls, completing a 30 m continuous walk. Parameters based on the shank angular velocity signals that were shown to be associated with MGC showed significant differences (p<0.05) between fallers and non-fallers yet did not correlate strongly (r<0.7) with two standard measures of falls risk (TUG & BBS). Weak correlations were observed between the angular velocity derived parameters and gait velocity. We conclude that these parameters are clinically meaningful and therefore may constitute a new measure of falls risk.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Accidental Falls / prevention & control*
  • Aged
  • Cohort Studies
  • Equipment Design
  • Female
  • Gait*
  • Humans
  • Male
  • Middle Aged
  • Monitoring, Ambulatory / methods*
  • Movement
  • Postural Balance
  • Residence Characteristics
  • Risk Assessment
  • Walking