Influence of allowable interruption period on estimates of accelerometer wear time and sedentary time in older adults

Emily L. Mailey, Neha P. Gothe, Thomas R. Wójcicki, Amanda N. Szabo, Erin A. Olson, Sean P. Mullen, Jason T. Fanning, Robert W. Motl, Edward McAuley

Research output: Contribution to journalArticlepeer-review

Abstract

The criteria one uses to reduce accelerometer data can profoundly influence the interpretation of research outcomes. The purpose of this study was to examine the influence of 3 different interruption periods (i.e., 20, 30, and 60 min) on the amount of data retained for analyses and estimates of sedentary time among older adults. Older adults (N = 311, Mage = 71.1) wore an accelerometer for 7 d and reported wear time on an accelerometer log. Accelerometer data were downloaded and scored using 20-, 30-, and 60-min interruption periods. Estimates of wear time, derived using each interruption period, were compared with self-reported wear time, and descriptive statistics were used to compare estimates of sedentary time. Results showed a longer interruption period (i.e., 60 min) yields the largest sample size and the closest approximation of self-reported wear time. A short interruption period (i.e., 20 min) is likely to underestimate sedentary time among older adults.

Original languageEnglish (US)
Pages (from-to)255-260
Number of pages6
JournalJournal of Aging and Physical Activity
Volume22
Issue number2
DOIs
StatePublished - Apr 2014

Keywords

  • Data reduction
  • Measurement
  • Physical activity
  • Sedentary

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Gerontology
  • Geriatrics and Gerontology

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