Improving Hip-Worn Accelerometer Estimates of Sitting Using Machine Learning Methods

PURPOSEThis study aimed to improve estimates of sitting time from hip-worn accelerometers used in large cohort studies by using machine learning methods developed on free-living activPAL data. METHODSThirty breast cancer survivors concurrently wore a hip-worn accelerometer and a thigh-worn activPAL...

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Bibliographic Details
Published in:Medicine and science in sports and exercise 2018-07, Vol.50 (7), p.1518-1524
Main Authors: KERR, JACQUELINE, CARLSON, JORDAN, GODBOLE, SUNEETA, CADMUS-BERTRAM, LISA, BELLETTIERE, JOHN, HARTMAN, SHERI
Format: Article
Language:English
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SPECIAL COMMUNICATIONS: Methodological Advances
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Summary:PURPOSEThis study aimed to improve estimates of sitting time from hip-worn accelerometers used in large cohort studies by using machine learning methods developed on free-living activPAL data. METHODSThirty breast cancer survivors concurrently wore a hip-worn accelerometer and a thigh-worn activPAL for 7 d. A random forest classifier, trained on the activPAL data, was used to detect sitting, standing, and sit–stand transitions in 5-s windows in the hip-worn accelerometer. The classifier estimates were compared with the standard accelerometer cut point, and significant differences across different bout lengths were investigated using mixed-effect models. RESULTSOverall, the algorithm predicted the postures with moderate accuracy (stepping, 77%; standing, 63%; sitting, 67%; sit-to-stand, 52%; and stand-to-sit, 51%). Daily level analyses indicated that errors in transition estimates were only occurring during sitting bouts of 2 min or less. The standard cut point was significantly different from the activPAL across all bout lengths, overestimating short bouts and underestimating long bouts. CONCLUSIONSThis is among the first algorithms for sitting and standing for hip-worn accelerometer data to be trained from entirely free-living activPAL data. The new algorithm detected prolonged sitting, which has been shown to be the most detrimental to health. Further validation and training in larger cohorts is warranted.
ISSN:0195-9131
1530-0315
DOI:10.1249/MSS.0000000000001578