The objective of this study is to optimize a novel, audio-recorded physical activity intervention that is scalable. Using principles of the Multiphase Optimization Strategy (MOST) framework, a full factorial study will test the unique and combined effects of different intervention components to identify which combination of components is optimal for increasing physical activity and mechanisms by which the components are or are not effective. This information will inform decisions about an optimal intervention package that is effective, efficient, and minimizes participant burden.
Eligible participants who provide informed consent will be enrolled in a 6-week study. At the baseline session, participants will be randomized to listen to a brief audio-recording of different guided thinking tasks. The audio-recordings are based on combinations of four different intervention components that will be tested in a 2 (positive affect imagery vs. neutral) x 2 (episodic future thinking vs. recent thinking) x 2 (action planning: yes, no) x 2 (dose: high vs. low) factorial trial. Participants will also complete a 30-minute brisk walking session on a treadmill. Participants will return for weekly visits in which they again listen to their assigned audio-recording and complete a 30-minute brisk walking session.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
192
Participants will listen to a guided thinking task directing them to think about themselves at a future, positive event and to imagine the event in vivid and specific detail.
Participants will listen to a guided thinking task directing them to think about positive feelings and associations about physical activity in specific, personal, and positive detail.
Participants will listen to a guided thinking task directing them to think about the remainder of their week and when, where, and how they plan to attain their remaining activity for the week.
Participants will listen to the audio-recording with the guided thinking tasks 5 times/week.
Participants will listen to a guided thinking task directing them to think about a regular habit or activity they completed in the past week and to imagine that activity in specific and vivid detail.
Participants will listen to a guided thinking task directing them to imagine physical sensations (i.e., movements, muscles used) of a routine, daily activity (non-physical activity).
Participants will listen to the audio-recording with the guided thinking tasks 1 time/week.
Southern Methodist University
Dallas, Texas, United States
RECRUITINGChange in Weekly Physical Activity Minutes Across 6 Weeks (accelerometer-assessed)
Amount of weekly moderate-to-vigorous (MVPA) minutes (i.e., minutes of MPVA weighted by intensity) will be determined from accelerometers (ActiGraph wGT3X-BT) worn for one-week periods for six consecutive weeks.
Time frame: Assessed weekly at Weeks 1-6
Change in Weekly Physical Activity Minutes Across 6 Weeks (self-reported)
Amount of weekly self-reported MVPA (i.e., minutes of MPVA weighted by intensity) will be determined using the 7-day Physical Activity Recall (PAR) interview.
Time frame: Assessed weekly at baseline and at Weeks 1-6
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