Recent evidence demonstrates the health benefits of reducing sedentary time, but this monitoring protocol was not designed to capture the full extent of sedentary time. The sedentary time is reported as a percentage of wear time, recognizing that the amount of sedentary time is influenced by the daily wear time of the accelerometer. Subjects were instructed to wear the accelerometer during waking hours and we compared accelerometry data with activity logs, but there is no way to establish the extent to which subjects actually adhered to these instructions. There was no change in sedentary time; this is not surprising because of the potential measurement issues, and the self-efficacy intervention did not emphasize the importance of reducing sedentary time.