A Dyadic Action Control Trial in Overweight and Obese Couples (DYACTIC)

Area of Science:

• Behavioral science
• Health psychology
• Public health

Background:

• Physical activity is crucial for overweight/obese individuals.
• Health behavior change theories often overlook social context.
• The Health Action Process Approach (HAPA) emphasizes self-regulation for behavior change.

Purpose of the Study:

• To investigate the effectiveness of a dyadic conceptualization of action control for promoting physical activity.
• To integrate social influences into the HAPA model.
• To compare dyadic action control with individual action control and control groups.

Main Methods:

• Single-blind randomized controlled trial with four groups: dyadic action control, individual action control, and two controls.
• Participants: Overweight/obese adult couples intending to increase physical activity.
• Intervention: 14-day ecological momentary intervention, followed by diary phases and 1-month/6-month follow-ups.

Main Results:

• Primary outcomes: self-reported and accelerometer-assessed physical activity.
• Secondary outcomes: Body Mass Index (BMI), aerobic fitness, habitual physical activity.
• This study is the first to examine dyadic action control in this context.

Conclusions:

• This study pioneers the examination of dyadic action control interventions for physical activity in couples.
• Discusses challenges and advantages of couple-based study designs.
• Highlights the importance of considering social context in health behavior interventions.