Health messages to promote fruit and vegetable consumption at different stages: A match-mismatch design.

Auteur(s) :
Godinho CA., Lima ML., Schwarzer R., Alvarez MJ.
Date :
Juil, 2015
Source(s) :
Psychology & health. # p
Adresse :
Instituto Universitário de Lisboa (ISCTE-IUL), CIS-IUL , Lisboa , Portugal. godinhocristina@gmail.com

Sommaire de l'article

OBJECTIVE:
To examine the effectiveness of matching health messages promoting fruit and vegetable intake to the Health Action Process Approach stages of change.

DESIGN:
In a randomised controlled trial, 205 undergraduate students (non-intenders n = 123; intenders n = 82) were exposed to one of three health messages, targeted at non-intenders, intenders and controls.

MAIN OUTCOME MEASURES:
Three longitudinal assessments of stage, fruit and vegetable intake, and social-cognitive determinants were obtained.

RESULTS:
Stage-specific effects of the interventions were confirmed. For self-efficacy, a stage by health message crossover interaction emerged, with both non-intenders and intenders in the matched conditions scoring higher in self-efficacy. Furthermore, in line with predictions, non-intenders in the matched condition showed higher risk perception, outcome expectancies, intention, and stage progression immediately after message exposure, and lower levels of action planning and coping planning a week later in the mismatched condition, but for these outcomes no differences across conditions were obtained among intenders. Multiple mediation analyses confirmed the facilitating role of self-efficacy and behavioural intention among non-intenders.

CONCLUSIONS:
Stages should be considered when designing health messages, although more interactive interventions for intenders and extended measurement time frames may be required.

Source : Pubmed
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