Standing Bout Patterns
Although the treadmill desk group engaged in more prescribed bouts (ie, 10-30 min) relative to controls after M6 and M12 over both the total day and workday (approximately 0.6-1.0 bout/day), an unintended response of engaging in more prolonged duration (ie, >30 min) standing bouts was observed among treadmill desk users. Specifically, treadmill desk users demonstrated trends of engaging in approximately 0.6 to 0.9 more prolonged standing bouts per day, relative to controls and sit-to-stand desk groups over both the total day and workday after M3 and sustained after M12. In contrast, sit-to-stand desk users were more compliant with the recommended intervention by increasing standing in prescribed bouts or shorter (ie, 1-10 min) after M3 and sustained this after M12 over both the total day (ie, approximately 1-2 bouts/day) and workday (approximately 3-8 bouts/day). These findings are noteworthy because prolonged static standing may be detrimental to cardiovascular health [Total day standing bout pattern distributions impacted total daily usual standing bout durations such that (1) both treatment groups demonstrated longer total daily usual standing bouts relative to controls after M3 and M12, where the increase ranged from approximately 4 to 7 minutes per bout, and (2) the treadmill desk group’s total daily usual standing bout duration was approximately 7 minutes longer than that of the sit-to-stand desk group at M3, but this trend was not sustained through M12. Similar increasing workday trends were evident when comparing the treadmill desk group with controls and sit-to-stand desk users after M3, where the increase ranged from approximately 6 to 9 minutes per bout, but these trends were only sustained through M12 in relation to the control group.