Propriedades psicométricas de uma escala de autoeficácia para a prática de atividade física em adultos Brasileiros

Translated title of the contribution: Psychometric properties of a self-efficacy scale for physical activity in Brazilian adults

Cassiano Ricardo Rech, Tais Taiana Sarabia, Rogério César Fermino, Pedro Curi Hallal, Rodrigo Siqueira Reis

Research output: Contribution to journalArticlepeer-review

Abstract

Objective. To test the validity and reliability of a self-efficacy scale for physical activity (PA) in Brazilian adults. Methods. A self-efficacy scale was applied jointly with a multidimensional questionnaire through face-to-face interviews with 1 418 individuals (63.4% women) aged ≥?18 years. The scale was submitted to validity (factorial and construct) and reliability analysis (internal consistency and temporal stability). A test-retest procedure was conducted with 74 individuals to evaluate temporal stability. Results. Exploratory factor analyses revealed two independent factors: self-efficacy for walking and self-efficacy for moderate and vigorous PA (MVPA). Together, these two factors explained 65.4% of the total variance of the scale (20.9% and 44.5% for walking and MVPA, respectively). Cronbach's alpha values were 0.83 for walking and 0.90 for MVPA, indicating high internal consistency. Both factors were significantly and positively correlated (rho ≥?0.17, P < 0.001) with quality of life indicators (health perception, self-satisfaction, and energy for daily activities), indicating an adequate construct validity. Conclusions. The scale's validity, internal consistency, and reliability were adequate to evaluate self-efficacy for PA in Brazilian adults.

Translated title of the contributionPsychometric properties of a self-efficacy scale for physical activity in Brazilian adults
Original languagePortuguese
Pages (from-to)259-266
Number of pages8
JournalRevista Panamericana de Salud Publica/Pan American Journal of Public Health
Volume29
Issue number4
DOIs
StatePublished - Apr 2011
Externally publishedYes

Keywords

  • Brazil
  • Exercise
  • Motor activity
  • Psychometrics
  • Self-efficacy

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

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