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).
- physical activity
- sedentary behaviour
- Seniors USP
Dall, P. M., Skelton, D. A., Dontje, M. L., Coulter, E. H., Stewart, S., Cox, S. R., Shaw, R. J., Cukic, I., Fitzsimons, C. F., Greig, C. A., Granat, M. H., Der, G., Deary, I. J., & Chastin, S. F. M. (2018). Characteristics of a protocol to collect objective physical activity/sedentary behaviour data in a large study: Seniors USP (understanding sedentary patterns). Journal for the Measurement of Physical Behaviour, 1(1), 26-31. https://doi.org/10.1123/jmpb.2017-0004