Article

OBJECTIVE: To develop and validate a self-report questionnaire to measure
barriers to regular physical activity (PA) in patients with stable coronary
artery disease (CAD). METHODS: Phase 1: 17 patients completed a semi-structured
interview. After grouping and reformulating the reported barriers, their
pertinence was reevaluated by the patients. Then, a decision algorithm was used
to select items. A principal component analysis was performed to determine
content validity. Phase 2: 49 patients completed the questionnaire resulting from
phase 1 twice, 7 days apart, and questionnaires to evaluate depression, anxiety,
and the level of physical activity. Construct validity was evaluated by analysis
of Spearman's correlation coefficient between the total score for the
questionnaire and a convergent dimension (anxiety), as well as a divergent
dimension (Dijon physical activity score). Internal consistency was evaluated by
Cronbach's alpha coefficient. Test-retest reliability was evaluated by the
intraclass coefficient (ICC). RESULTS: Eleven items were selected after phase 1.
The questionnaire presented good face validity and the content validity seemed
satisfactory after analysis of the literature by the experts. Construct validity
was moderate. Internal consistency was very good (Cronbach's alpha>0.81).
Reproducibility was excellent with an ICC at 0.95. Feasibility was good with less
than 3minutes to complete the questionnaire. CONCLUSION: This questionnaire
presents good psychometric properties. A further prospective study should
evaluate sensitivity to change and help determine a threshold value indicating
the need for a specific behavioral strategy to alleviate barriers to physical
activity in these patients.
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Langue : ANGLAIS