Validation of a Body-Worn Accelerometer to Measure Activity Patterns in Octogenarians

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• 作者：Lynne M. Taylor ; MSc<sup>asup><sup> ; sup><sup>lm.taylor@auckland.ac.nz" class="auth_mail" title="E-mail the corresponding authorsup> ; Jochen Klenk ; PhD<sup>bsup><sup> ; sup><sup>csup> ; Alistair J. Maney<sup>dsup> ; Ngaire Kerse ; PhD ; MBChB<sup>esup> ; Bruce M. MacDonald ; PhD<sup>fsup> ; Ralph Maddison ; PhD<sup>asup>
• 关键词：Accelerometry ; Geriatric assessment ; Physical activity ; Rehabilitation
• 刊名：Archives of Physical Medicine and Rehabilitation
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：95
• 期：5
• 页码：930-934
• 全文大小：453 K

文摘

To determine the validity of a triaxial body-worn accelerometer for detection of gait and postures in people aged >80 years.

sSec_2">Design

spara0015">Participants performed a range of activities (sitting, lying, walking, standing) in both a controlled and a home setting while wearing the accelerometer. Activities in the controlled setting were performed in a scripted sequence. Activities in the home setting were performed in an unscripted manner. Analyzed accelerometer data were compared against video observation as the reference measure.

sSec_3">Setting

spara0020a">Independent-living and long-term-care retirement village.

sSec_4">Participants

spara0020">Older people (N=22; mean age &plusmn; SD, 88.1&plusmn;5y) residing in long-term-care and independent-living retirement facilities.

sSec_5">Interventions

spara0025">Not applicable.

sSec_6">Main Outcome Measures

spara0030">The level of agreement between video observation and the accelerometer for the total duration of each activity, and second-by-second correspondence between video observation and the accelerometer for each activity.

sSec_7">Results

spara0035">The median absolute percentage errors between video observation and the accelerometer were <1% for locomotion and lying. The absolute percentage errors were higher for sitting (median, &minus;22.3%; interquartile range [IQR], &minus;62.8% to 10.7%) and standing (median, 24.7%; IQR, &minus;7.3% to 39.6%). A second-by-second analysis between video observation and the accelerometer found an overall agreement of ≥85% for all activities except standing (median, 56.1%; IQR, 34.8%&ndash;81.2%).

sSec_8">Conclusions

spara0040">This single-device accelerometer provides a valid measure of lying and locomotion in people aged >80 years. There is an error of approximately 25% when discriminating sitting from standing postures, which needs to be taken into account when monitoring longer-term habitual activity in this age group.