This is a substudy to a randomised trial investigating the effect of liraglutide on body weight and pain in overweight or obese patients with knee osteoarthritis (NCT02905864). In the parent trial, patients will be subjected to an 8-week diet intervention phase including a low-calorie diet and dietetic counselling, after which.they will be randomised to receive either liraglutide 3 mg or liraglutide 3 mg placebo as an add-on to dietetic guidance on re-introducing regular foods and a focus on continued motivation to engage in a healthy lifestyle. This substudy aims to investigate any changes in physical activity associated with the initial 8-week weight loss intervention.
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Further Inclusion Criteria: * Eligible for parent trial (NCT02905864) * Owner of a smart phone Exclusion Criteria: * Known allergies against band-aids The eligibility criteria for this sub-study (i.e. owner of a smartphone and no known allergies against Band-Aids) are not considered requirements for participation in the parent study. Nor will any violation of this sub-study protocol affect participation, care, or attention given from the parent study.