Long-term findings from a dyadic planning intervention with couples motivated to increase physical activity
AbstractBackground: Individual action planning was shown to help increase physical activity. Dyadic planning involves a source of support in the planning process and refers to a target person creating plans together with a partner for when, where, and how the target person will act. We report 1-year follow-up findings of an RCT with couples investigating effects of a dyadic-planning intervention on physical activity and -fitness in target persons and partners. Relationship quality was explored as a moderator. Methods: Couples (N=338, target persons randomised) were randomly assigned to one of 3 conditions: a) dyadic-planning (DPC), b) individual-planning, where target persons planned and partners worked on a distractor task (IPC), and c) a no-planning dyadic-control condition (CC). Physical activity was objectively measured in 4 one-week assessments up to 1-year post-intervention. Cardio-respiratory fitness and relationship quality were assessed at baseline and 1-year follow-up. Multi-level models were fit. Findings: Compared to IPC- and CC-target persons, whose moderate activity increased up to 1-year post-intervention, DPC-target persons remained stable. Follow-up analyses indicated that only within the DPC, target persons with higher, as opposed to lower, a-priori relationship quality increased moderate activity (p<.10). DPC-partners showed steeper increases in cardio-respiratory fitness when compared to partners of the IPC, but not the CC. Discussion: A dyadic planning intervention appeared to have more beneficial long-term effects on planning partners than on target persons. Although a-priori relationship quality further qualified this pattern, findings resemble social support evidence indicating more beneficial effects for support providers than for recipients.
Copyright (c) 2017 N. Knoll, J. Keller, D.H. Hohl, G. Hosoya, U. Scholz, S. Burkert
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