Physical Inactivity
Conditions
Brief summary
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.
Detailed description
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.
Interventions
BEHAVIORALAction planning
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.
BEHAVIORALHigh dose
Participants will listen to the audio-recording with the guided thinking tasks 5 times/week.
BEHAVIORALRecent thinking
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.
BEHAVIORALEpisodic future thinking
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.
BEHAVIORALPositive affect imagery
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.
BEHAVIORALNeutral imagery
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).
BEHAVIORALLow dose
Participants will listen to the audio-recording with the guided thinking tasks 1 time/week.
Sponsors
National Cancer Institute (NCI)
University of Kansas Medical Center
University of North Carolina, Charlotte
Southern Methodist University
Study design
Allocation
RANDOMIZED
Intervention model
FACTORIAL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 64 Years
Healthy volunteers
Yes
Inclusion criteria
* Adults ages 18-64 * Not currently meeting physical activity guidelines (\<150 minutes/week of self-reported moderate-to-vigorous physical activity) * Capable of providing informed consent * Access to a smartphone with active data plan * Willing to attend all study visits and comply with the protocol * Conversant in English
Exclusion criteria
* BMI \> 40 * orthopedic problems that would limit physical activity * self-reported coronary artery disease, stroke, COPD, chronic bronchitis, emphysema, diabetes
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in Weekly Physical Activity Minutes Across 6 Weeks (accelerometer-assessed) | Assessed weekly at Weeks 1-6 | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change in Weekly Physical Activity Minutes Across 6 Weeks (self-reported) | Assessed weekly at baseline and at Weeks 1-6 | 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. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Delayed Discounting | Assessed weekly at baseline and at Weeks 1-6 | The rapid delay discounting task will be assessed after listening to the audio-recording in-person (post-intervention). Will be assessed as a putative mechanism. |
| Affective Response to Exercise | Assessed weekly at baseline and at Weeks 1-6 | The Feeling Scale measures affective responses to exercise on a -5 to +5 scale with higher scores indicated a more positive affective response. It will be assessed during- and post-exercise for the in-person brisk walking sessions. Will be assessed as a putative mechanism. |
| Physical Activity Intentions | Assessed weekly at baseline and at Weeks 1-6 | The physical activity intentions scale (Conner et al., 2017) measures intentions for physical activity on a 1 to 5 scale with higher scores indicating stronger intentions. It will be assessed after the in-person brisk walking session. Will be assessed as a putative mechanism. |
| Action Planning | Assessed weekly at baseline and at Weeks 1-6 | The action planning scale (Sniehotta et al., 2005) measures action planning for physical activity on a 1 to 4 scale with higher scores indicating higher levels of planning. It will be assessed after listening to the audio-recording in-person (post-intervention). Will be assessed as a putative mechanism. |
| Intrinsic Motivation for Exercise | Assessed weekly at baseline and at Weeks 1-6 | The intrinsic subscale of the Behavioral Regulations in Exercise Questionnaire measures intrinsic motivation using a 0 to 4 response scale with higher scores indicating greater intrinsic motivation. It will be assessed after listening to the audio-recording in-person (post-intervention). Will be assessed as a putative mechanism. |
Countries
United States
Contacts
Primary ContactColin Lamb, BA
Outcome results
None listed