This project capitalizes on principles of control systems engineering to build a dynamical model that predicts weight change during weight loss maintenance using behavioral, psychosocial, and environmental indicators evaluated in a system identification experiment. A 6-month behavioral obesity treatment will be administered to produce weight loss. Participants losing at least 3% of initial body weight will be followed for an additional 12 months via daily smartphone surveys that incorporates passive sensing to objectively monitor key behaviors. Survey data pertaining to behavioral, psychosocial, and environmental indicators will be used to develop a controller algorithm that can predict when an individual is entering a heightened period of risk for regain and why risk is elevated. Interventions targeting key risk indicators will be randomly administered during the system ID experiment. Survey and passive sensing data documenting the effects of the interventions will likewise drive development of the controller algorithm, allowing it to determine which interventions are most likely to counter risk of regain.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
180
This intervention involves learning and practicing relaxation exercises and setting aside time for pleasurable activities.
This intervention involves identifying values related to weight, lifestyle, and health; identifying barriers to value-consistent living; exploring the consequences of letting barriers drive behavior; and 4) setting goals that are small, specific, attainable, and values-consistent.
This intervention involves dietary self-monitoring with the goal of staying within a calorie goal ranging from 1,200 kcal/day to 1,800 kcal/day. Participants are also provided with meal planning tools and encouraged to addresses hunger and cravings by promoting feelings of satiety via consumption of foods that are high in volume but low in calories.
This simple intervention prompts participants at the start of the day to schedule up to 30 minutes of moderate-to-vigorous intensity physical activity; brisk walking is encouraged. Participants also set a bedtime and wake time and are encouraged to set a reminder alarm to ensure at least 8 hours of sleep.
Miriam Hospital Weight Control and Diabetes Resarch Center
Providence, Rhode Island, United States
RECRUITINGWeight change
This will be measured throughout the system identification experiment using a consumer scale with internet connectivity.
Time frame: Every day during the 52-week system identification experiment
Intervention engagement
Intervention engagement will be measured by the smartphone application that delivers intervention. Engagement is defined as the count of clicks to open intervention resources.
Time frame: Every day during the 52-week system identification experiment
Weight Locus of Control
Mean scale score of questionnaire items adapted from the Multidimensional Health Locus of Control scale for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Perceived Benefit of Weight Control
Mean scale score of questionnaire items adapted from the Beliefs about Dietary Compliance Scale and the Exercise Benefits/Barriers scale for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Weight Control Strategies Intentions and Implementation
Mean scale score of questionnaire items adapted from the Weight Control Strategies scale for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Hunger and Cravings
Mean scale score of questionnaire items adapted from the Three Factor Eating Questionnaire for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Affect
Mean scale score of questionnaire items adapted from the Profile of Mood States and Positive and Negative Affect States for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Stress
Mean scale score of questionnaire items adapted from Cohen's Stress Scale for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Self-efficacy
Mean scale score of questionnaire items adapted from the short-form Weight Efficacy Lifestyle Questionnaire for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Sleep
Wrist-worn accelerometer-measured sleep timing, duration \& quality.
Time frame: Every day during the 52-week system identification experiment
Social Support
Mean scale score of questionnaire items adapted from the short-form Multidimensional Scale of Perceived Social Support for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Physical Activity
Wrist-worn accelerometer-measured minutes per day of physical activity.
Time frame: Every day during the 52-week system identification experiment
Dysregulated Eating
Mean scale score of questionnaire items adapted from the Three Factor Eating Questionnaire for smartphone administration.
Time frame: Every day during the 52-week system identification experiment
Dietary Lapse
Count of self-reported instances of unintended eating, eating larger portions than one intended, and eating foods that one intended to avoid
Time frame: Every day during the 52-week system identification experiment
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