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L. Jasper1, L. Beaupre1, C.A. Jones1, J. Spence2
1University of Alberta, Department of Physical Therapy, Edmonton, Canada, 2University of Alberta, Faculty of Kinesiology, Sport, and Recreation, Edmonton, Canada
Background: Total knee arthroplasty (TKA) has been shown to improve pain and function but little information exists on whether levels of stationary behavior also improve in older adults following this surgery. Accurate information on stationary behavior is necessary to avoid the detrimental effects of stationary behavior on health. The use of <5000 steps per day as been suggested as a clinically relevant step-defined sedentary lifestyle index (SLI) but the index’s association with stationary behavior has not yet been determined.
Purpose: To measure stationary behavior in older adults following total TKA and determine the clinical utility of the SLI as a measure of stationary behavior following TKA.
Methods: Stationary behaviors, including stationary time, stationary bouts, breaks from stationary time, and the proportion of participants meeting the SLI, were measured in a cohort of older adults three months post-TKA using accelerometry. A two-way analysis of variance test (α = 0.05) was conducted to determine the effects of SLI (<5000 or ≥5000 daily steps) and possible interactions with sex on stationary behavior.
Results: Sixty-five older adults spent 80% (13.17 hours, SD 2.30) of their waking time in stationary time and had an average of 6 bouts of >30 consecutive minutes in stationary time per day. Forty (61.5%) of the participants fell below the SLI of 5000 steps/day. SLI had significant effects on both waking stationary time (p<0.001) and number of breaks in stationary time (p<0.001) with participants taking <5000 daily steps having longer stationary times (13.98 vs. 11.88 hours, mean difference 2.09, 95% CI 1.13 to 3.06) and fewer breaks in stationary time (22.62 vs. 35.98, mean difference 13.36, 95% CI -8.48 to 18.25). No interactions were found between SLI and sex.
Conclusion(s): Both women and men had high levels of stationary behavior three months following TKA. The SLI discriminated waking stationary time and breaks in stationary time between those participants taking <5000 or ≥5000 daily steps so may have clinical utility in the measurement of stationary behavior.
Implications: These findings will influence recommendations regarding stationary behavior as well as informing design of appropriate interventions to maximize health for older adults following TKA. As step counting is a common and easily accessible form of measuring activity, these findings suggest the SLI may be a clinically relevant tool for measuring stationary behavior.
Funding, acknowledgements: This study was supported by an Innovation Grant from the Covenant Health Network of Excellence in Seniors’ Health and Wellness.
Keywords: sedentary behavior, accelerometry, steps
Topic: Health promotion & wellbeing/healthy ageing/physical activity
Did this work require ethics approval? Yes
Institution: University of Alberta
Committee: University of Alberta Research Ethics Board
Ethics number: Pro00062054
All authors, affiliations and abstracts have been published as submitted.
