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Postnatal Exercise Partners Study (PEEPS): a pilot randomized trial of a dyadic physical activity intervention for postpartum mothers and a significant other
Carr RM, Quested E, Stenling A, Thogersen-Ntoumani C, Prestwich A, Gucciardi DF, McVeigh J, Ntoumanis N
Health Psychology and Behavioral Medicine 2021;9(1):251-284
clinical trial
6/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: Yes; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: No; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

BACKGROUND: Research suggests dyadic interventions can increase physical activity; such interventions are untested within postpartum parent couples. METHODS: A three-armed pilot randomized trial addressed this gap and tested which type of dyadic intervention is most effective. Inactive postpartum mothers and a significant other were recruited in Australia (n = 143 assessed for eligibility) and randomised in a single-blinded fashion (ie, participants were blinded) to 1 of 3 dyadic conditions involving a single face-to-face session with access to web-based group support: a minimal treatment control (n = 34), collaborative planning group (n = 38), or collaborative planning plus need supportive communication group (n = 30). Participants were asked to wear their accelerometers for 8 days and completed self-report measures at baseline, end of intervention (week 4), and follow-up (week 12). We expected dyads in the collaborative planning plus need supportive communication group would have the greatest increases in physical activity (PA), autonomous motivation, and partners' need supportive behaviours; and decreases in controlled motivation and controlling partner behaviours. RESULTS: Results from 51 dyads using Bayesian actor-partner interdependence models provided some evidence for a small positive effect on total PA at follow-up for postpartum mothers in the collaborative planning group and for partners in the collaborative planning plus need supportive communication group. Furthermore, partners in the collaborative planning plus need supportive communication group were more likely to engage in some vigorous PA. At follow-up, postpartum mothers in the collaborative planning plus need supportive communication group scored lower on personal autonomous reasons. CONCLUSIONS: The impact of prior specification mean intervention effects need to be interpreted with caution. Progression to a full trial is warranted.

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