Physical activity and sedentary time in persons with obstructive sleep apnea and overweight enrolled in a randomized controlled trial for enhanced physical activity and healthy eating

• BackgroundThe aim of the study was to describe the amount of physical activity and sedentary time in patients with obstructive sleep apnea syndrome (OSAS) and overweight, and to explore potential disease-related and psychological correlates.MethodsA descriptive and correlational study was performed. Prospective data of physical activity and sedentary time were collected through accelerometry, and a one-point measurement of body mass index (BMI), daytime sleepiness, exercise self-efficacy, fear of movement, and depressive symptoms. Seventy-three participants with overweight (mean BMI 35kg/m2 SD 5) and moderate/severe OSAS (Apnea-Hypopnea Index >15) were consecutively recruited. Multivariate associations were determined through multiple linear regression analysis.ResultsThe participants took a daily average of 7734 (SD 3528) steps, spent an average of 77 (SD 54) minutes in moderate-to-vigorous physical activity (MVPA), and spent 11h 45 min (SD 2h 8 min) sedentary. BMI, daytime sleepiness, exercise self-efficacy, fear of movement, and depressive symptoms did not explain variance in MVPA or steps, but explained 22.9% of variance in sedentary time. In backward selection analysis, BMI contributed to the explanatory degree of MVPA with 9% whereas, fear of movement explained 6.3% of the variance in steps and 14.3% of the variance in sedentary time.ConclusionsAn important implication for future physical activity interventions is that both physical activity and sedentary behaviors should be targeted, and fear of movement may be an important determinant for change in patients with OSAS and overweight.

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