Sedentary time and physical activity were derived from sensor-based triaxial accelerometers, ActiGraph model wGT3X-BT (ActiGraph LCC, Pensacola, FL, USA). Participants were instructed to wear the accelerometers for 7 days in a belt around the right hip during waking hours. The only exception was during water-based physical activity. The software ActiLife v.6.13.3 was used to start the accelerometers and for transferring and processing collected data. The movements from three axes were recorded by accelerometer. Accelerometer data was extracted as 60-s epochs and expressed in counts per minute (cpm). Non-wear time was considered when the participants had no movements for 60 or more consecutive minutes. Wear time was estimated as 24 h minus non-wear time. Participants with at least 4 days wear time were included.
Total physical activity was expressed in daily mean cpm. Sedentary time was expressed when activity was less than 200 cpm, low intensity physical activity as 200–2689 cpm, moderate intensity physical activity as 2690–6166 cpm, and vigorous physical activity as 6167 cpm or more. A sedentary time of 20 min or more of below 200 cpm was defined as prolonged sedentary. Detailed information about assessment of physical activity is described by Ekblom-Bak et al. [17 (link)].
Total physical activity was expressed in daily mean cpm. Sedentary time was expressed when activity was less than 200 cpm, low intensity physical activity as 200–2689 cpm, moderate intensity physical activity as 2690–6166 cpm, and vigorous physical activity as 6167 cpm or more. A sedentary time of 20 min or more of below 200 cpm was defined as prolonged sedentary. Detailed information about assessment of physical activity is described by Ekblom-Bak et al. [17 (link)].
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