Evaluation of a Body-Worn Sensor System to Measure Physical Activity in Older People With Impaired Function.
Background. There is limited information on reliable and valid measures of physical activity in older people with impaired function. Objective. This study was conducted to compare the accuracy of single-axis accelerometers in recognizing postures and transitions and step counting with the accuracy o...
| Publicado en: | Physical Therapy Vol. 91; no. 2; pp. 277 - 286 |
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| Autores principales: | , , , , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Oxford University Press / USA
Feb2011
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=104821708&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104821708 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00319023 PTH jtl: Physical Therapy issn: 00319023 maglogo: N pubinfo: dt: Feb2011 vid: 91 iid: 2 pid: 10398 pub: Oxford University Press / USA artinfo: ui: 104821708 58615479 10.2522/ptj.20100159 NLM21212377 104821708 ppf: 277 ppct: 9 formats: fmt: @attributes: type: P tig: atl: Evaluation of a Body-Worn Sensor System to Measure Physical Activity in Older People With Impaired Function. aug: au: Taraldsen, Kristin Askim, Torunn Sletvold, Olav Einarsen, Elin Kristin BjÃ¥stad, Karianne Grüner Indredavik, Bent Helbostad, Jorunn Laegdheim affil: PhD student, Department of Neuroscience, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway; Department of Geriatrics, St. Olav¿s Hospital, Trondheim University Hospital, Olav Kyrres g 17, N-7006 Trondheim, Norway sug: subj: Physical Activity Evaluation Persons with Disabilities Accelerometers Equipment Reliability Human Aged Cross Sectional Studies Clinical Assessment Tools Scales Barthel Index Data Analysis Software Videorecording P-Value Validation Studies Funding Source Body Positions Female Male Middle Age Aged, 80 and Over Stroke Physiopathology Hip Fractures Physiopathology Gait Aged: 65+ years Middle Aged: 45-64 years Aged, 80 & over Female Male ab: Background. There is limited information on reliable and valid measures of physical activity in older people with impaired function. Objective. This study was conducted to compare the accuracy of single-axis accelerometers in recognizing postures and transitions and step counting with the accuracy of video recordings in people with stroke (n=14), older inpatients (n=14), people with hip fracture (n=8), and a reference group of 10 adults who were healthy. Design. This was a cross-sectional study, evaluating the concurrent validity of small body-worn accelerometers against video observations as the criterion measure. Methods. Activity data were collected from 3 sensors (activPAL) attached to the thighs and the sternum and from registration of the same activities from video recordings. Participants performed a test protocol of in-bed, transfer, and walking activities. Results. The sensor system was highly accurate in classifying lying, sitting, and standing positions (100%) and in recognizing transitions from lying to sitting positions and from sitting to standing positions (100%). Placement of a sensor on the nonaffected leg resulted in less underestimation of step counts than placement on the affected leg. Still, the sensor system underestimated step counts during walking, especially at slow walking speeds (≤0.47 m/s) (limits of agreement=-2.01 to 16.54, absolute percent error=40.31). Limitations. The study was performed in a controlled setting and not during the natural performance of activities. Conclusions. The activPAL sensor system provides valid measures of postures and transitions in older people with impaired walking ability. Step counting needs to be improved for the sensor system to be acceptable for this population, especially at slow walking speeds. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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