NCT03094858

Evaluation of a Smartphone Intervention to Reduce Sedentary Behavior

• Status: Withdrawn
• Phase: N/A
• Study type: Interventional
• Enrollment: 0 (actual)
• Sponsor: University of Oklahoma · Academic / Other
• Sex: All
• Age: 18 Years – 99 Years
• Healthy volunteers: Accepted

Summary

Participants (N = 300) will be randomly assigned to: 1) an equipment-only comparison group that receives a smartphone and an activity monitor wristband but does not receive smartphone intervention prompts, or 2) the intervention group who will receive an activity monitor wristband that works in conjunction with a smartphone to reduce sedentary time via smartphone prompts during prolonged sedentary bouts. All participants will be provided with a Fitbit® wristband activity monitor and an Android smartphone on the same day of the week (i.e., Mondays). Participants will complete a 1-week baseline accelerometer and EMA period prior to the start of the intervention. Participants will be followed for 26 weeks after the intervention begins with follow-up visits at 6, 13, and 26 weeks. The primary outcome will be accelerometer-measured time spent in sedentary activity. Sedentary breaks, total active time, and time spent in light, moderate, and vigorous activity will be additionally evaluated as outcomes. Contextual variables and potential treatment mechanisms will be assessed via traditional questionnaire measurement and daily random EMAs at baseline and all follow-up visits. Brief smartphone-based daily diary assessments will be completed daily for the duration of the study.

Conditions

• Risk Reduction Behavior

Interventions

Type	Name	Description
DEVICE	Smartphone with prompts	Smartphone will be used to prompt randomly selected participants in intervention group to be active
DEVICE	Wristband	Wristband will monitor activity of all participants
DEVICE	Smartphone	Smartphone will be used to monitor activity but prompts will not be given to randomly selected participants

Timeline

• Start date: 2019-03-01
• Primary completion: 2020-04-01
• Completion: 2020-04-01
• First posted: 2017-03-29
• Last updated: 2021-06-11