A novel behavioural INTErvention to REduce Sitting Time in older adults undergoing orthopaedic surgery (INTEREST): results of a randomised-controlled feasibility study

Justin Avery Aunger, Colin J Greaves, Edward T Davis, Evans Atiah Asamane, Anna C Whittaker, Carolyn Anne Greig, Justin Avery Aunger, Colin J Greaves, Edward T Davis, Evans Atiah Asamane, Anna C Whittaker, Carolyn Anne Greig

Abstract

Background: Osteoarthritis is a prevalent condition in older adults that causes many patients to require a hip or knee replacement. Reducing patients' sedentariness prior to surgery may improve physical function and post-operative outcomes.

Methods: We conducted a pragmatic randomised-controlled feasibility study with 2:1 allocation into intervention or usual care groups. The intervention, based on Self-Determination Theory, involved techniques to reduce sedentary behaviour, including motivational interviewing, setting of behavioural goals, and more. The primary outcome was feasibility, assessed using mixed methods. We included exploratory measures to inform a future definitive trial, such as ActivPal3 accelerometry to measure movement, the Short Physical Performance Battery (SPPB), Basic Psychological Needs, and cardiometabolic biomarkers. Assessments were at baseline, 1-week pre-surgery, and 6-week post-surgery.

Results: We recruited 35 participants aged ≥ 60 years approximately 8 weeks before hip or knee arthroplasty. Participant uptake rate was 14.2%, and retention rate 85.7%. Participants were very satisfied with the study which was found to be feasible with some modifications. Exploratory within-group comparisons found that the intervention has potential to improve SPPB by 0.71 points from baseline to pre-surgery, a clinically significant increase, and reduce sedentary time by up to 66 min d-1.

Conclusion: In this older surgical population, it is feasible to use behavioural techniques to displace sedentary time to activity and to conduct a trial spanning the period of surgical intervention. This may improve physical function and surgical outcomes. The INTEREST intervention is now ready for evaluation in a full-scale randomised-controlled trial.

Registration: This trial was registered on Clinicaltrials.gov on 13/11/2018. ID: NCT03740412.

Keywords: Behaviour change; Intervention; Older adults; Osteoarthritis; Prehabilitation; Sedentary.

Conflict of interest statement

The authors have no competing interests to declare.

Figures

Fig. 1
Fig. 1
Consort 2010 participant flow diagram [33]
Fig. 2
Fig. 2
Step count targets set during intervention, versus mean daily step counts measured at pre-surgery (T2)
Fig. 3
Fig. 3
Plots of individual changes in short physical performance battery (SPPB) in each group, as well as sedentary time, from T1 to T2. For SPPB, positive change is better, and for sedentary time, negative change is preferred
Fig. 4
Fig. 4
Changes over time in variables assessed within this section. Error bars are standard error. SPPB short physical performance battery, BPNS basic psychological needs in general scale
Fig. 5
Fig. 5
INTEREST logic model with areas assessed by an outcome measure indicated in blue, and those unassessed indicated in red. Bold, italic text indicates the outcome measure used to measure the attached outcome or assumption

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