Introduction: Teachers have a high prevalence of insufficient physical activity (PA) levels. However, the barriers to the practice of PA in this population and their associated factors are still not established in the literature. Objective: To describe the barriers to PA and identify associated factors in public school teachers. Methods: The sample was composed of 246 teachers (45.2 ± 10.4 years, 76% women). Barriers to PA, socioeconomic status, work-related factors, and habitual level of PA were assessed by questionnaire. The PA level according to each reported barrier was compared by analysis of variance and the association between barriers for PA and the categories of independent variables was analyzed by binary logistic regression. Results: Lack of Time (LT) and laziness, tiredness, or discouragement (LTD) were the most widely reported barriers (36.2% and 35.0%, respectively). Obese teachers were more likely to report LTD (OR = 2.34, p < 0.05) and less likely to report no barrier to PA (OR = 0.07, p < 0.05), when compared with teachers with normal weight. Teachers who reported working 21-30 hours per week were more likely to report LTD than those who worked 20 hours or less per week (OR = 4.12, p < 0.05). Teachers with a moderate-to-low PA level in leisure-time and sports practice were more likely to report LTD as the main barrier to PA (OR = 2.53, p < 0.05 and OR = 2.29, p < 0.05; respectively). Conclusion: LT and LTD were the most frequently reported barriers to PA by teachers. LTD was associated with obesity, higher hours worked, and lower levels of PA in leisure-time and sports practice.
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