title: Differences in trunk kinematic between frail and nonfrail elderly persons during turn transition based on a smartphone inertial sensor.
abstract: OBJECTIVE
  Firstly, to, through instrumentation with the iPhone4 smartphone, measure and describe variability of tridimensional acceleration, angular velocity, and displacement of the trunk in the turn transition during the ten-meter Extended Timed-Get-up-and-Go test in two groups of frail and physically active elderly persons. Secondly, to analyse the differences and performance of the variance between the study groups during turn transition (frail and healthy).
  
  
  METHODS
  This is a cross-sectional study of 30 subjects over 65 years, 14 frail subjects, and 16 healthy subjects.
  
  
  RESULTS
  Significant differences were found between the groups of elderly persons in the accelerometry (P < 0.01) and angular displacement variables (P < 0.05), obtained in the kinematic readings of the trunk during the turning transitions. The results obtained in this study show a series of deficits in the frail elderly population group.
  
  
  CONCLUSIONS
  The inertial sensor found in the iPhone4 is able to study and analyse the kinematics of the turning transitions in frail and physically active elderly persons. The accelerometry values for the frail elderly are lower than the physically active elderly, whilst variability in the readings for the frail elderly is also lower than the control group.
authors.affiliation: Department of Physical Therapy, School of Medicine, University of Málaga, 29071 Málaga, Spain.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Galán-Mercant
authors.affiliation: Department of Physical Therapy, School of Medicine, University of Málaga, 29071 Málaga, Spain ; School of Clinical Sciences of the Faculty of Health at the Queensland University of Technology, Brisbane, QLD 4000, Australia.
authors.forename: Antonio I
authors.initials: AI
authors.lastname: Cuesta-Vargas
mesh_terms: D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D040421:Cell Phone; D005260:Female; D016330:Frail Elderly; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology