Knowledge of the psychosocial determinants of physical activity is critical to informing preventive and therapeutic interventions in the workplace. This study reviewed available evidence on psychosocial factors that have been associated with physical activity among workers. Studies were selected in December 2019 from the Scopus, Web of Science, and PubMed databases, with no date limits, using the following search terms: “physical activity”, “physical exercise”, “psychosocial”, “workers”, and “working-age”. Thirty-nine studies published between 1991 and 2019 were evaluated. The determinants of physical activity investigated among workers were smoking status, stress, psychosocial working conditions, depression, anxiety, social relationships, work ability, job satisfaction, burnout, and self-efficacy. Some consistencies and controversies were observed in the associations among these determinants and physical activity and are discussed, as are suggestions for future studies. The findings of this review may be of interest to physical activity interventions designed to reduce psychosocial risks factors in work environments.

Objective: To examine the effects of high-intensity interval training on body fat indicators in overweight and obese adults. Methods: Randomized trials were included in the systematic review. Direct measures (e.g. whole-body fat) and indirect measures (e.g. waist circumference) were examined. Results: From 1156 articles initially screened, 24 were included. The majority of studies were conducted, at least, for 10 weeks. High-intensity interval training elicited reductions in whole- body fat indicators. The meta-analytic models showed significant differences after high-intensity interval training intervention among body weight, fat mass and fat percentage. On the other hand, body mass index and waist circumference did not present significant results. Conclusions: High-intensity exercise training can induce body composition improvements in overweight and obese individuals. High-intensity interval training may be a time-efficient component of weight management programs.

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Fatores psicossociais do trabalho podem afetar a saúde física e mental dos indivíduos. Neste sentido, evidências mostram que a atividade física e o apoio social no trabalho promovem benefícios à saúde de trabalhadores, sobretudo na redução do estresse. Objetivos: Avaliar a associação entre estresse ocupacional, apoio social no trabalho e frequência semanal de atividade física em trabalhadores terceirizados. Métodos: Estudo transversal com amostra de conveniência de 182 trabalhadores terceirizados de ambos os sexos e de diferentes cargos, com idade entre 21 e 72 anos (39±11,4), os quais responderam ao questionário Demand Control-Support Questionnaire, para avaliar o estresse ocupacional e o apoio social no trabalho, e ao Questionário Internacional de Atividade Física curto, para avaliar a frequência da atividade física. A associação entre os constructos foi investigada através da regressão de Poisson. O nível de significância adotado foi de 5%. Resultados: Uma associação inversa significativa (p < 0,05) foi encontrada entre trabalho passivo e frequência de atividade física de caminhada para mulheres (risco relativo de 0,70; intervalo de confiança de 95% de 0,5-0,9), enquanto, para homens, foi encontrada com frequência de atividade física vigorosa (risco relativo de 0,70; intervalo de confiança de 95% de 0,4-0,9). Todavia, uma associação inversa significativa (p < 0,05) entre apoio social e atividade física foi encontrada apenas em mulheres (risco relativo de 0,66; intervalo de confiança de 95% de 0,4-0,9) e para intensidade moderada e vigorosa (risco relativo de 0,65; intervalo de confiança de 95% de 0,4-0,9). Conclusões: Estresse ocupacional e apoio social no trabalho estão associados à frequência semanal de atividade física. No entanto, disparidades podem ser observadas entre homens e mulheres e intensidade de atividade física. Palavras-chave | estresse ocupacional; saúde mental, exercício físico; relações interpessoais. ABSTRACT | Introduction:Psychosocial factors at work can affect individuals' physical and mental health. In this sense, evidence shows that physical activity and social support at work promote benefits to workers' health, especially regarding stress reduction. Objectives: To evaluate the association between occupational stress, social support at work, and weekly frequency of physical activity among outsourced workers. Methods: This is a cross-sectional study with a convenience sample comprising 182 outsourced workers of both sexes and different positions, aged between 21 and 72 years (39 ± 11.4); the participants answered the Demand-Control-Support Questionnaire for assessing occupational stress and social support at work and the International Physical Activity Questionnaire -Short Form for assessing the frequency of physical activity. The association between constructs was investigated through a Poisson regression. The significance level was set to 5%. Results: A significant inverse association (p < 0.05) was found between passive work and frequency of physical activity (walking) among women (r...