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Mediators of a 12-month change in physical activity in ethnically diverse sample of postpartum women.

ABSTRACT: Purpose:Understanding theoretically derived social and behavioral mediators of long-term increases in physical activity (PA) in a vulnerable population at risk for being underactive is needed to inform future research, clinical applications, and public health efforts. This is an analysis of potential mediators of an intervention that increased long-term (12-month) moderate-to-vigorous physical activity (MVPA) in postpartum (2-12months) women in a randomized trial, using a longitudinal analysis. Methods:Healthy, underactive (i.e., not meeting national guidelines for MVPA) women (n = 311; mean age = 32 ± 5.6 years, 85% minorities) with infants (mean age: 5.7 ± 2.8 months) were randomly assigned to either a tailored eHealth condition consisting of personalized telephone counseling plus access to a website tailored to new mothers' MVPA issues or to a standard MVPA materials-only website. MVPA was assessed via surveys completed at baseline, then 6 and 12 months later. Theoretically derived mediators included social support for MVPA, self-efficacy to increase MVPA, barriers to increasing MVPA, and benefits of increasing MVPA. Results:All mediators, except benefits, improved over the 12 months in the tailored eHealth condition. The tailored condition's effect on increasing MVPA from 6 months to 12 months was mediated by an increase in social support from baseline to six months. No other hypothesized mediators were significant. Conclusion:Our results demonstrated that learning strategies to increase social support for MVPA was instrumental in new mothers' increase in MVPA over a 12 month intervention. During this brief but impactful life-stage, where the focus can understandably be on her baby, being able to elicit support from friends and family may facilitate women's efforts to focus on their own needs with respect to MVPA. Trial Registration:ClinicalTrials.gov number.

SUBMITTER: Albright CL

PROVIDER: S-EPMC6980416 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Mediators of a 12-month change in physical activity in ethnically diverse sample of postpartum women.

Albright Cheryl L CL Wilkens Lynne R LR Saiki Kara K White Kami K KK Steffen Alana D AD

Translational journal of the American College of Sports Medicine 20191001 19

<h4>Purpose</h4>Understanding theoretically derived social and behavioral mediators of long-term increases in physical activity (PA) in a vulnerable population at risk for being underactive is needed to inform future research, clinical applications, and public health efforts. This is an analysis of potential mediators of an intervention that increased long-term (12-month) moderate-to-vigorous physical activity (MVPA) in postpartum (2-12months) women in a randomized trial, using a longitudinal an ...[more]

PMID: 31984225

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Project description:BackgroundFew studies have examined recreational physical activity (RPA) after participating in a structured exercise intervention. More specifically, little is known about the long-term effects of exercise interventions in post-menopausal women. This study had two objectives: 1) To compare RPA in postmenopausal women in the exercise group and the control group 12 months after the end of the Alberta Physical Activity and Breast Cancer Prevention (ALPHA) Trial; and 2) To apply the Theory of Planned Behaviour (TPB) to identify predictors of RPA 12 months post-intervention among women in the exercise group.MethodsSelf-reported RPA 12-months post-intervention from a validated questionnaire was used to estimate RPA levels for control group (118/160, 74% response) and exercise group participants (126/160, 79% response). Bivariate analysis was used to compare RPA between exercise and control group participants and to identify TPB variables for multivariate analysis. Logistic regression was applied to TPB data collected from self- administered questionnaires at end of trial by exercise group participants (126/160, 79% response) to identify predictors of long-term RPA.ResultsAt 12 months post-intervention, 62% of women in the exercise group were active compared to 58% of controls (p = 0.52). Of the TPB constructs examined, self-efficacy (OR =2.98 (1.08-8.20)) and behavioural beliefs (OR = 1.46 (1.03-2.06)) were identified as predictors of RPA for exercise group participants.ConclusionsLevels of RPA in the exercise and control groups were comparable 12 months post intervention, indicating that participation in the ALPHA trial was associated with increased physical activity in previously inactive women, regardless of randomization into either the exercise group or in the control group. Exercise interventions that promote self-efficacy and positive behavioural beliefs have the potential to have long-term impacts on physical activity behaviour, although further research is needed to examine additional psychological, social and environmental predictors of long-term RPA in post-menopausal women.Trial registrationClinicalTrials.gov NCT00522262.

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Mediators of a 12-month change in physical activity in ethnically diverse sample of postpartum women.

Publications

Mediators of a 12-month change in physical activity in ethnically diverse sample of postpartum women.

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