Step-count accuracy of three motion sensors for older and frail medical inpatients

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dc.contributor.authorMcCullagh, Ruth
dc.contributor.authorDillon, Christina B.
dc.contributor.authorO'Connell, Ann Marie
dc.contributor.authorHorgan, N. Frances
dc.contributor.authorTimmons, Suzanne
dc.contributor.funderHealth Research Boarden
dc.date.accessioned2016-09-28T11:34:43Z
dc.date.available2016-09-28T11:34:43Z
dc.date.issued2016-09-22
dc.description.abstractObjectives: To measure the step-count accuracy of an ankle-worn accelerometer, a thigh-worn accelerometer and one pedometer in older and frail inpatients. Design: Cross-sectional design study. Setting: Research room within a hospital. Participants: Convenience sample of inpatients aged ≥65 years, able to walk 20 metres unassisted, with or without a walking-aid. Intervention: Patients completed a 40-minute programme of predetermined tasks while wearing the three motion sensors simultaneously. Video-recording of the procedure provided the criterion measurement of step-count. Main Outcome Measures: Mean percentage (%) errors were calculated for all tasks, slow versus fast walkers, independent versus walking-aid-users, and over shorter versus longer distances. The Intra-class Correlation was calculated and accuracy was visually displayed by Bland-Altman plots. Results: Thirty-two patients (78.1 ±7.8 years) completed the study. Fifteen were female and 17 used walking-aids. Their median speed was 0.46 m/sec (interquartile range, IQR 0.36-0.66). The ankle-worn accelerometer overestimated steps (median 1% error, IQR -3 to 13). The other motion sensors underestimated steps (40% error (IQR -51 to -35) and 38% (IQR -93 to -27), respectively). The ankle-worn accelerometer proved more accurate over longer distances (3% error, IQR 0 to 9), than shorter distances (10%, IQR -23 to 9). Conclusions: The ankle-worn accelerometer gave the most accurate step-count measurement and was most accurate over longer distances. Neither of the other motion sensors had acceptable margins of error.en
dc.description.sponsorshipHealth Research Board (Research Fellowship Training Grant HPF-2013-451)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMcCullagh, R., Dillon, C., O’Connell, A. M., Horgan, N. F. and Timmons, S. (2016) ‘Step-count accuracy of three motion sensors for older and frail medical inpatients’, Archives of Physical Medicine and Rehabilitation, 98(2), pp. 295-302. doi: 10.1016/j.apmr.2016.08.476en
dc.identifier.doi10.1016/j.apmr.2016.08.476
dc.identifier.endpage302
dc.identifier.issn0003-9993
dc.identifier.issued2
dc.identifier.journaltitleArchives of Physical Medicine and Rehabilitationen
dc.identifier.startpage295
dc.identifier.urihttps://hdl.handle.net/10468/3129
dc.identifier.volume98
dc.language.isoenen
dc.publisherElsevier B.V.en
dc.rights© 2016 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0 licenseen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectWalkingen
dc.subjectDimensional measurement accuracyen
dc.subjectFrailen
dc.subjectElderlyen
dc.subjectIn-patientsen
dc.titleStep-count accuracy of three motion sensors for older and frail medical inpatientsen
dc.typeArticle (peer-reviewed)en
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