Assessing physical activity in persons with knee osteoarthritis using accelerometers: Data from the osteoarthritis initiative

Arthritis Care and Research - Tập 62 Số 12 - Trang 1724-1732 - 2010
Jing Song1, Pamela A. Semanik2, Leena Sharma2, Rowland W. Chang2, Marc C. Hochberg3, W. Jerry Mysiw4, Joan M. Bathon5, Charles B. Eaton6, Rebecca D. Jackson4, C. Kent Kwoh7, M. Nevitt8, Dorothy D. Dunlop2
1Northwestern University
2Northwestern University Feinberg School of Medicine, Chicago, Illinois
3University of Maryland School of Medicine, Baltimore
4Ohio State Univ., Columbus#TAB#
5Johns Hopkins University School of Medicine, Baltimore, Maryland
6Alpert Medical School of Brown University, Providence, Rhode Island
7University of Pittsburgh School of Medicine and Pittsburgh VA Healthcare System, Pittsburgh, Pennsylvania
8University of California—San Francisco

Tóm tắt

AbstractObjectivePhysical activity measured by accelerometers requires basic assumptions to translate the output into meaningful measures. We used accelerometer data from the Osteoarthritis Initiative to investigate in the context of knee osteoarthritis (OA) the following data processing assumptions derived from the general US adult population: nonwear (a period the monitor was removed), based on zero activity exceeding 60 minutes; and a valid day of monitoring, based on wear time evidence exceeding 10 hours.MethodsWe examined the influence of nonwear thresholds ranging from 20 to 300 minutes of zero activity on mean daily activity minutes (counts >0), mean daily activity counts, and mean daily moderate to vigorous physical activity minutes. The effect of selecting minimums of 8, 10, or 12 wear hours to signify a valid day of monitoring on data retention was examined.ResultsOur sample of 3,536 days of accelerometer data from 519 persons with knee OA showed that mean daily activity minutes increased with the nonwear threshold until stabilizing at 463 minutes per day, corresponding to the 90‐minute nonwear threshold. Similar patterns were observed for mean daily activity counts. Varying the nonwear threshold had no effect on mean daily moderate to vigorous physical activity minutes. Choosing the 90‐minute nonwear threshold and a minimum of 10 wear hours to constitute a valid day provided 94% data retention.ConclusionData supported applying the 90‐minute nonwear threshold to the knee OA population instead of the 60‐minute threshold for the general population, while retaining the 10‐hour valid day threshold.

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Arthritis Care and Research

Tập 62 Số 12

1724-1732

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