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Characteristics of a protocol to collect objective physical activity/sedentary behaviour data in a large study: Seniors USP (understanding sedentary patterns

Research output: Contribution to journalArticle

  • Philippa M. Dall
  • Dawn A. Skelton
  • Manon L. Dontje
  • Elaine Coulter
  • Sarah Stewart
  • Simon Cox
  • Reuben J Shaw
  • Iva Čukić
  • Claire Fitzsimons
  • Carolyn A Greig
  • Malcolm H. Granat
  • Geoff Der
  • Ian Deary
  • Sebastien Francois Martin Chastin

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Original languageEnglish
Pages (from-to)26-31
JournalJournal of the Measurement of Physical Behaviour
Issue number1
Early online date31 Mar 2018
Publication statusE-pub ahead of print - 31 Mar 2018


The Seniors USP study measured sedentary behaviour (activPAL3, 9 day wear) in older adults. The measurement protocol had three key characteristics: enabling 24-hour wear (monitor location, waterproofing); minimising data loss (reducing monitor failure, staff training, communication); and quality assurance (removal by researcher, confidence about wear). Two monitors were not returned; 91% (n=700) of returned monitors had 7 valid days of data. Sources of data loss included monitor failure (n=11), exclusion after quality assurance (n=5), early removal for skin irritation (n=8) or procedural errors (n=10). Objective measurement of physical activity and sedentary behaviour in large studies requires decisional trade-offs between data quantity (collecting representative data) and utility (derived outcomes that reflect actual behaviour).

    Research areas

  • methodology, accelerometer, adherence, data loss, activpal, posture

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