LAUSR

OBJECTIVE Intervening on barrier beliefs (BBs) may inhibit the role of barriers as mediating factors in lifestyle behavior. The aim of this study was to analyze the effects of a barrier-belief counseling intervention (BBCI) on physical activity (PA) and healthy food intake. METHODS An RCT was conducted in a primary care setting among adults (aged 18-70), with two interventions: a BBCI (n = 123) and a standardized lifestyle group intervention (SLI) (n = 122). A non-treated hanging control group (n = 36) received no intervention. Outcomes on PA (accelerometer and SQUASH) and fruit and vegetable intake (self-report) were measured with follow-ups at 6, 12 and 18 months, and analyzed using multiple regression. RESULTS The BBCI was more effective on PA compared with the SLI (p < .01): in the short term all PA outcomes improved (p < .05), in the long term moderate-to-vigorous PA outcomes improved (p < .05), all with small effect sizes. No differences between interventions were found on fruit and vegetable intake. None of the outcomes in the control group changed over time. CONCLUSIONS BBCI in primary care improves PA compared with SLI. PRACTICE IMPLICATIONS The customized BB approach seems promising for implementation in healthcare practice to stimulate PA.