Abstract
Objective
We examine if the Gray Matters intervention (education and behavioral self-monitoring app targeting lifestyle risks for Alzheimer’s disease [AD]) affected participants’ motivation for change and whether high motivation predicts improved diet and physical activity over 6 months.
Design
In this 6-month randomized controlled trial (treatment n=104; control n=42; assessed pre/post intervention) amotivation, external regulation, identified regulation, and intrinsic motivation were assessed via the Situational Motivation Scale (SIMS). Diet quality was assessed via adherence to the DASH diet, and physical activity was assessed in minutes.
Participants
Eligibility criteria included not having significant cognitive impairment. Participants were aged 39–64 (M = 54.17, SD = 6.9), 66% female, 81% married, 90% White, and 80% had a college degree.
Intervention
Treatment included an activity tracker, Gray Matters app, access to booster sessions, contact with a student health coach, and study website.
Setting
Participants were in the general community.
Results
Independent samples t-tests determined that intrinsic motivation (IM) increased significantly for the treatment group (M = 2.09 SD = 4.82), compared to the control group (M = 1.00 SD = 5.52; t (130) = -3.04, p =.003). Comparing subgroups of people with High vs Low IM we found that High IM males increased vigorous physical activity more than Lower IM males (F(1,42)=5.053, p=.030). Comparing persons aged 58–64 years with High vs Lower IM, High IM persons had less improvement in diet quality F(1,48)=4.538; p=0.038).
Conclusion
RCT results support that the Gray Matters AD-focused intervention increased IM, and IM was associated with improved physical activity and diet quality for some subgroups.
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Funding
Funding: This project was funded by the Vice President for Research seed grant, Utah State University, and the Department for Employment and Learning, Northern Ireland.
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Ethical Standards: This research was approved through Utah State University’s Institutional Review Board for the protection of human subjects and complies with all laws governing research in the United States.
Conflicts of Interest: Alex Schiwal reports no conflicts of interest. Elizabeth Fauth reports no conflicts of interest. Heidi Wengreen Reports no conflicts of interest. Maria Norton Reports no conflicts of interest.
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Schiwal, A., Fauth, E.B., Wengreen, H. et al. The Gray Matters App Targeting Health Behaviors Associated with Alzheimer’s Risk: Improvements in Intrinsic Motivation and Impact on Diet Quality and Physical Activity. J Nutr Health Aging 24, 893–899 (2020). https://doi.org/10.1007/s12603-020-1421-5
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DOI: https://doi.org/10.1007/s12603-020-1421-5