Does feedback from activity trackers influence physical activity? Evidence from a randomized controlled trial
Last registered on June 17, 2021

Pre-Trial

Trial Information
General Information
Title
Does feedback from activity trackers influence physical activity? Evidence from a randomized controlled trial
RCT ID
AEARCTR-0007831
Initial registration date
June 16, 2021
Last updated
June 17, 2021 2:49 PM EDT
Location(s)
Region
Primary Investigator
Affiliation
University of Michigan
Other Primary Investigator(s)
PI Affiliation
University of Southern California
PI Affiliation
University of Southern California
Additional Trial Information
Status
Completed
Start date
2019-07-17
End date
2020-02-13
Secondary IDs
Abstract
To estimate the effect of feedback provided by a commercial activity tracker (Fitbit Versa, FV) on measured physical activity (PA), we have designed an experiment in which participants (1) consecutively wear an activity monitor that provides feedback (Fitbit Versa) or (2) an activity monitor that does not provide feedback (GENEActiv, GA). During a one or two-day period subjects were wearing both devices, allowing for
calibration of FV to GA. We find a highly significant increase of about 7% in PA, resulting from the feedback provided by the commercial tracker.
External Link(s)
Registration Citation
Citation
Darling, Jill , Arie Kapteyn and Htay-Wah Saw. 2021. "Does feedback from activity trackers influence physical activity? Evidence from a randomized controlled trial." AEA RCT Registry. June 17. https://doi.org/10.1257/rct.7831-1.1.
Sponsors & Partners
Sponsor(s)
Experimental Details
Interventions
Intervention(s)
We asked respondents to wear electronic devices that tracked their activity level for 16 consecutive days.
Intervention Start Date
2019-07-17
Intervention End Date
2020-02-13
Primary Outcomes
Primary Outcomes (end points)
Level of Physical Activity
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
We have designed an experiment in which participants (1) consecutively wear an activity monitor that provides feedback (Fitbit Versa) for 8 consecutive days or (2) an activity monitor that does not provide feedback (GENEActiv, GA) for 8 consecutive days.
Experimental Design Details
Randomization Method
Randomization done in office by a computer
Randomization Unit
Individuals.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
120
Sample size: planned number of observations
120
Sample size (or number of clusters) by treatment arms
Wave 1 Arm 1: 32
Wave 1 Arm 2: 25
Wave 2 Arm 1: 31
Wave 2 Arm 2: 32
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
NA
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
University of Southern California
IRB Approval Date
Details not available
IRB Approval Number
N/A
Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
Yes
Intervention Completion Date
February 13, 2020, 12:00 AM +00:00
Is data collection complete?
Yes
Data Collection Completion Date
February 13, 2020, 12:00 AM +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
120
Was attrition correlated with treatment status?
No
Final Sample Size: Total Number of Observations
82
Final Sample Size (or Number of Clusters) by Treatment Arms
81
Data Publication
Data Publication
Is public data available?
No

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Program Files
Program Files
No
Reports, Papers & Other Materials
Relevant Paper(s)
REPORTS & OTHER MATERIALS