Abstract
Little is known about the impact that physical activity (PA) coaching interventions have on sedentary behaviours. The aim of this study was to investigate if a coaching intervention that increases PA coincidentally influences objectively measured sedentary time in insufficiently physically active adults. We recruited 120 insufficiently physically active ambulatory hospital patients and randomized them to either receive a PA coaching intervention designed to increase objectively measured moderate-to-vigorous-intensity PA (MVPA) or be part of a control group. Participants wore an accelerometer for seven days at baseline, post-intervention (three months) and follow-up (nine months). Changes in the average length of sedentary bouts, proportion of time in sedentary behaviours and number of sedentary bouts were evaluated using mixed-model ANOVAs. At baseline, both groups undertook 67 ± 13 sedentary bouts and spent 69% ± 6% of their time in sedentary behaviours. Compared with control, the intervention group decreased the number of sedentary bouts by 24% and the proportion of time in sedentary behaviours by 7% (p < 0.001). Significant changes were not observed between the groups for average length of sedentary bouts. The PA intervention led to a decrease in the number of sedentary bouts and proportion of time in sedentary behaviours. Future research should investigate PA coaching interventions designed to target simultaneous changes in MVPA and sedentary behaviours.
Highlights
Both insufficient physical activity (PA) and sedentary behaviours contribute significantly to ill health and are major challenges to public health [1]
The Healthy 4U-2 study was a randomised controlled trial examining the effectiveness of a PA coaching intervention for insufficiently physically active adults recruited from an ambulatory hospital clinic
Baselineoutcome outcomemeasures measures were werecompleted completedfor forall allparticipants participantsprior priortotogroup groupallocation
Summary
Both insufficient physical activity (PA) and sedentary behaviours contribute significantly to ill health and are major challenges to public health [1]. Sedentary behaviour refers to any waking activity, performed in a sitting, lying or reclining position, with an energy expenditure of ≤1.5 metabolic equivalents (METs) [2]. Insufficient PA refers to not meeting PA guidelines of 150 min of moderate-to-vigorous physical activity (MVPA) per week for health [3]. Individuals can meet or exceed the PA guidelines and still spend the majority of the day in sedentary behaviours [4]. A recent review using accelerometer-based estimates indicated that adults spend approximately 8.2 h of their waking day in sedentary behaviours [6].
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