Table 4.

Challenges and solutions or strategies for utilizing the Fitbit physical activity (PA) tracker in health interventions at the data management stage.

Challenges			Strategies and solutions
Determining Fitbit wear time
	Individualized manual approach (not recommended for large studies)	Review participants’ daily heart rate data through the Fitbit platform to identify gaps indicating nonwear time and develop rules for determining adherence to wearing Fitbit.
	Automated approach	Utilize an existing platform or application (eg, iCardia, Fitabase) that will automatically calculate Fitbit wear time based on the incoming heart rate data or develop your own application to remotely collect the data utilizing Fitbit’s Web APIa.
Accuracy of sedentary minutes calculated by Fitbit			Calculate adjusted sedentary time based on heart rate and wear-time data.
Data export			Export and organize participant data weekly and before study closeout.

^aAPI: application programming interface.