Crosscultural adaptation and validation of Veterans Specific Activity Questionnaire for brazilian population with cardiovascular

Author(s)

Gabriela de Barros Leite Domingues

• Document type: Master's Dissertation
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Ciências Médicas
• Defense date: 2010-06-15

Examining board members

Maria Cecilia Bueno Jayme Gallani; Aparecida Maria Catai; Otávio Rizzi Coelho

• Advisor: Maria Cecilia Bueno Jayme Gallani; Claudio Alexandre Gobatto

Abstract

Exercise capacity is considered an important prognostic factor in patients with cardiovascular disease (CVD). Questionnaires have been developed to evaluate the exercise capacity, among which stands out the Veterans Specific Activity Questionnaire (VSAQ). Objectives: The aim of this study is to present the process of crosscultural adaptation of the VSAQ to the Brazilian culture, and to investigate its content validity, and assess its reliability and convergent validity by correlation with peak oxygen consumption (VO2 peak), with the lactate anaerobic threshold and with the level of physical activity. Methodology: The process of cultural adaptation followed internationally recommended methodology included the steps of translation, back translation, review by an experts committee to assess the semantic, idiomatic and cultural equivalences identity is not culturally relevant activities and lifting of the most frequent activities in daily (24-hour recall) with the sample of the population of interest (n = 20:24, respectively); analysis by a second committee, the equivalence of metabolic activities included to replace those not culturally compatible and two pretests (n = 30). The proportion of agreement of the first committee of experts was quantified using the Content Validity Index (CVI). Reliability was assessed using the criterion of stability (test-retest), with the remaining 50 patients, with an interval of 7-15 days. For the validity analysis was tested with a different sample of the first stage the correlation of the Brazilian version of METs VSAQ and nomogram with the direct and indirect measures of physical capacity: METs and VO2 peak (measured by cardiopulmonary exercise test), score Baecke habitual physical activity and lactate anaerobic threshold. This step was performed in 140 patients with symptoms of CVD, were referred to exercise testing for clinical reasons. Data analysis: For analysis of the evaluation agreement of the judges as to semantic, idiomatic and cultural equivalence was used content validity index (CVI); for analysis of the validity of agreement was used Kappa coefficient; for analysis of the correlation between VSAQ and objective measures of physical capacity and frequency of physical activity was used Pearson correlation coefficient. Adopted was p < 0.05 significance level. Results: The assessment of equivalence between metabolic activities and the original replaced showed 54% agreement among judges. Then, the activities with lower levels of agreement were replaced by others to achieve consensus among the committee members. Analysis of testretest showed concordance coefficient (Kappa) k = 0.86 (p < 0.001), suggesting evidence of temporal stability of the instrument. The Brazilian version VSAQ and nomogram showed moderate to strong correlation with measures of peak measured VO2 and peak measured METs (r =. 54, .63, .52, .60, p < .001). The score Baecke's habitual physical activity was significantly correlated with METs nomogram corrected by (r =. 28, p < .001). It was found a significant partial correlation (corrected by the protocol of exercise testing) between the anaerobic threshold and lactate METs nomogram and corrected by the measured peak VO2 (r =. 25, .52, p < .05, p < .001). Conclusion: The Brazilian version of VSAQ after extensive and rigorous process of cultural adaptation presented evidence of temporal stability and evidence of convergent validity for measuring exercise tolerance in people with cardiovascular symptoms. (AU)

• FAPESP's process: 08/07701-6 - CROSS-CULTURAL ADAPTATION AND VALIDATION OF THE VETERANS SPECIFIC ACTIVITY QUESTIONNAIRE
• Grantee: Gabriela de Barros Leite Domingues
• Support Opportunities: Scholarships in Brazil - Master