title: Can an accelerometer-based monitor be used to accurately assess physical activity in a population of survivors of critical illness?
abstract: OBJECTIVE
  To investigate the validity and reliability of the Activity Monitoring Pod (AMP331) to record gait parameters in  healthy young adults (YA) and intensive care unit inpatients (ICU).
  
  
  METHODS
  Fifteen YA completed a series of over-ground walks. Another 15 YA completed a series of treadmill walks. The ICU group (N=20) completed a series of over-ground walks with repeat trials. Gait parameters were recorded simultaneously for each walk.
  
  
  RESULTS
  For the YA over-ground condition, no significant differences were found between the measures recorded by the systems. For the YA treadmill condition, 43% of the measures differed (P &lt; .05). For the ICU group, the AMP331 underestimated distance and speed by 3m and 25cm/s respectively. Reliability measures for distance (ICC 0.99, 95%CI 0.98 - 0.99) and step count (ICC 0.99, 95%CI 0.99 - 1.00) were excellent.
  
  
  CONCLUSIONS
  The AMP 331 is a valid instrument for recording basic gait parameters for over-ground walking in healthy YA and ICU survivors.
authors.affiliation: Department of Physiotherapy, The University of Melbourne, Victoria, Australia. larae@unimelb.edu.au
authors.forename: Lara
authors.initials: L
authors.lastname: Edbrooke
authors.forename: Noel
authors.initials: N
authors.lastname: Lythgo
authors.forename: Unna
authors.initials: U
authors.lastname: Goldsworthy
authors.forename: Linda
authors.initials: L
authors.lastname: Denehy
mesh_terms: D056044:Actigraphy / Q000295:instrumentation*; D000293:Adolescent; D000328:Adult; D016638:Critical Illness / Q000534:rehabilitation; D005260:Female; D006801:Humans; D007297:Inpatients; D008297:Male; D009043:Motor Activity; D017741:Survivors; D055815:Young Adult