NCT07044570

eMOTION: Examining Implicit Attitudes in Physical Activity Engagement

Using Real-Time Data Capture to Examine Implicit Attitudes as Mediators of Physical Activity Adherence in Interventions

• Status: Recruiting
• Phase: —
• Study type: Observational
• Enrollment: 120 (estimated)
• Sponsor: University of Southern California · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Accepted

Summary

This early-phase trial will test intervention strategies to influence implicit attitudes towards physical activity and determine whether changes in those mechanisms result in change in physical activity behavior among inactive adults who are overweight or obese.

Detailed description

This ORBIT model phase 1 trial will examine whether implicit attitudes (1) can be experimentally manipulated in real-world settings; and (2) mediate the relationship between interventions and physical activity behavior. A novel physical activity intervention will be optimized by efficiently disentangling the effects of its core component and two enhancement components on affective mechanisms associated with physical activity engagement.

Conditions

• Physical Activity
• Overweight or Obesity
• Cancer

Interventions

Type	Name	Description
BEHAVIORAL	Physical Activity Goals mHealth Intervention	On days participants plan to exercise, they engage in two daily goal sessions (morning and evening). Morning sessions provide an activity goal for the day and ask the participant to create a plan, anticipate barriers, and brainstorm solutions for achieving this goal. The affect-based goal condition asks participants to engage in either (1) a type (50% of daily goals) or (2) a context (50% of daily goals) of physical activity that allows them to experience positive affect. Goals focused on context are randomly generated to suggest that the participant performs activity (1) in a place; (2) in a social situation; or (3) while listening to something that makes them feel good. The intensity-based goal condition asks participants to maintain a certain target heart rate range during physical activity. Starting heart rate reflects the approximate age-adjusted heart rate max, with goals progressively increasing from 55% to 70% heart rate max.
BEHAVIORAL	TYPE/CONTEXT enhancement	TYPE/CONTEXT augments intervention effects by providing tailored recommendations for activity types and contexts that satisfy personally-important psychological needs as rated by each participant at baseline. Ratings from a crowdsourced panel of adults on Amazon Mechanical Turk will be used to determine the potential for specific activity types and contexts to satisfy psychological needs; our tailoring algorithm will then recommend the corresponding activity type or context while accounting for reported constraints (e.g., ability, access). These details will be incorporated into a tailored recommendation provided to participants each Sunday as they make activity plans for the upcoming week. Specifically, the program will randomly select either type or context (i.e., location, audio, social) recommendations and will rotate every two weeks. For TYPE, participants' top 3 activity types are recommended; for CONTEXT, participants' top 3 activity contexts are recommended.
BEHAVIORAL	SAVOR enhancement	SAVOR implements a brief savoring exercise on the smartphone that takes place either after the planned physical activity session or during the evening goal session (after the self-monitoring module). Participants will respond to questions that are intended to enhance and prolong positive experiences during physical activity. To trigger attentional deployment, a common savoring strategy that involves intensifying experiences by focusing on them, participants will answer three open-ended prompts. These prompts are drawn from a prompt pool with slightly varied wording to promote a sense of novelty. Savoring prompts will rotate daily and have a day lag built in every week (i.e., Week 1 Monday Savoring Prompts are Week 2 Tuesday Savoring Prompts).

Timeline

• Start date: 2025-03-24
• Primary completion: 2026-04-30
• Completion: 2026-06-30
• First posted: 2025-07-01
• Last updated: 2025-11-03

Locations

1 site across 1 country: United States