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dc.rights.licenseCreative Commons Attribution 4.0 International License
dc.contributor.authorPrescott, Sean
dc.contributor.authorTraynor, Jamie P.
dc.contributor.authorShilliday, Ilona
dc.contributor.authorZanotto, Tobia
dc.contributor.authorRush, Robert
dc.contributor.authorMercer, Tom
dc.identifier.citationPrescott, S., Traynor, J. P., Shilliday, I., Zanotto, T., Rush, R. & Mercer, T. (2020) Minimum accelerometer wear-time for reliable estimates of physical activity and sedentary behaviour of people receiving haemodialysis. BMC Nephrology, 21:230.
dc.descriptionFrom Springer Nature via Jisc Publications Router
dc.descriptionHistory: received 2020-01-31, accepted 2020-06-01, registration 2020-06-01, online 2020-06-16, epub 2020-06-16, collection 2020-12
dc.description.abstractBackground: Low levels of physical activity are implicated in low life expectancies of people receiving maintenance haemodialysis. Accelerometers are increasingly being used to quantify activity behaviours of this population but guidance to quality-assure such data is lacking. The objective of this study was to provide data processing and reduction recommendations to ensure accelerometer-derived outcomes are sufficiently reliable for interpretative analysis. Methods: Seventy people receiving maintenance haemodialysis (age 55.9 ± 15.7 years, 34% women, 23% diabetic) from a single outpatient renal unit volunteered for the study. Participants wore Actigraph GT3x and ActivPAL monitors during waking hours over seven days. Reliability of accelerometer output (normalised to wear-time) was assessed via intraclass correlation coefficient (ICC). The Spearman-Brown prophecy formula was subsequently applied to the ICCs to derive the minimum required accelerometer wear-time for each behavioural outcome. Results: Monitor wear compliance was greater on dialysis compared to non-dialysis days (90% v 77%). Participants were significantly more active on non-dialysis days compared to dialysis days but there were no significant differences in estimated behaviours between days within the same condition. Average measure ICCs for all accelerometer outcomes were high (range 0.76–0.96). Computations indicated that habitual physical activity and sedentary behaviour could be estimated with a minimum reliability level of 0.80 from one dialysis day and two non-dialysis days, and at least eight hours monitor wear per day. Applying this rubric allowed 90% of participant data to be retained for further analysis. Conclusions: Regardless of accelerometer, one dialysis and two non-dialysis days data with a minimum of eight hours wear each day should enable habitual activity of people receiving maintenance haemodialysis to be characterised with acceptable reliability. These recommendations reconcile the tension between wear-time criteria stringency and retention of an adequately representative sample.
dc.publisherBioMed Central
dc.relation.ispartofBMC Nephrology
dc.subjectResearch Article
dc.subjectPre-dialysis Care And Dialysis
dc.subjectPhysical Activity
dc.titleMinimum accelerometer wear-time for reliable estimates of physical activity and sedentary behaviour of people receiving haemodialysis
qmu.authorMercer, Tom
qmu.authorZanotto, Tobia
qmu.authorRush, Robert
qmu.authorPrescott, Sean
qmu.centreCentre for Health, Activity and Rehabilitation Research

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Creative Commons Attribution 4.0 International License
Except where otherwise noted, this item's license is described as Creative Commons Attribution 4.0 International License