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

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dc.check.date2017-09-22
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
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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