CalFitness Smartphone-Delivered Physical Activity Intervention With Messaging

Study Overview
=================
Brief Summary
-----------------
The overall goal of this study is to test personalized mobile phone-based physical activity interventions among students at the University of California, Berkeley. Most physical fitness applications for smartphones and activity trackers use a constant goal for the number of steps each day. However, if the step goals are dynamically adjusted according to past behavior, then the corresponding goals may encourage individuals to increase their physical activity level. This study consists of a randomized controlled trial in which we are assessing the efficacy of four different algorithms for calculating personalized goals for the number of steps each day and for determining which motivational messages to send each day.

Official Title
-----------------
Mobile Phone-Based Physical Activity Intervention on University Staff

Conditions
-----------------
Sedentary Lifestyle, Physical Activity

Intervention / Treatment
-----------------
* Behavioral: Step Goal Delivery by Smartphone
* Behavioral: Message Delivery by Smartphone


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: intent to become physically active own an iPhone 5s (or newer model) willing to keep the iPhone in pockets during the day willing to install and use the intervention app every day for 4 months ability to speak and read English. Exclusion Criteria: known medical conditions or physical problems that require special attention in an exercise program planning an international trip during the next 4 months, which could interfere with daily server uploads of mobile phone data pregnant/gave birth during the past 6 months severe hearing or speech problem history of an eating disorder current substance abuse current participation in lifestyle modification programs or research studies that may confound study results history of bariatric surgery or plans for bariatric surgery in the next 12 months.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
Accepts Healthy Volunteers

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Constant Steps Goal<br>Step Goal Delivery by Smartphone | Behavioral: Step Goal Delivery by Smartphone<br>* Step Goal Delivery by Smartphone<br>|
| Experimental: Averaged Steps Goals and Random Messages<br>Step Goal Delivery by Smartphone Message Delivery by Smartphone | Behavioral: Step Goal Delivery by Smartphone<br>* Step Goal Delivery by Smartphone<br>Behavioral: Message Delivery by Smartphone<br>* Message Delivery by Smartphone<br>|
| Experimental: Algorithm Steps Goal and Random Messages<br>Step Goal Delivery by Smartphone Message Delivery by Smartphone | Behavioral: Step Goal Delivery by Smartphone<br>* Step Goal Delivery by Smartphone<br>Behavioral: Message Delivery by Smartphone<br>* Message Delivery by Smartphone<br>|
| Experimental: Algorithm Steps Goal and Messages<br>Step Goal Delivery by Smartphone Message Delivery by Smartphone | Behavioral: Step Goal Delivery by Smartphone<br>* Step Goal Delivery by Smartphone<br>Behavioral: Message Delivery by Smartphone<br>* Message Delivery by Smartphone<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Daily Steps Taken Per Day |  | 10 weeks |