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[Analysis on the association of physical activity with metabolic syndrome in a population-based study of Japanese-Brazilians].

Sedentary behavior-related diseases can be prevented by lifestyle changes. Part of the cardiovascular benefits of physical activity (PA) may be due to low-grade inflammation. This study describes the PA of a population of Japanese and analyses its association with metabolic syndrome (MS) adjusted a number of variables. This was based on a database previously created following a population-based study of Japanese-Brazilians. 1,330 subjects aged > or = 30 years, of both sexes, living in Bauru, were included and they were submitted to interviews, being obtained sociodemographic, health, physical activity and dietary data, as well as clinical and laboratory data. Physical activity assessment focused on activities during work and leisure times. Diagnosis of MS was based on an adaptation of NCEP criteria for Asians. Non-conditional logistic regression had MS as the dependent variable. Men (46.1%) and women showed similar mean ages (57.0 +/- 12.8 and 56.9 +/- 12.2 years, respectively). A slight preponderance of females was observed. Men had a higher level of education and more frequently were smokers (p< 0.001); their mean values of BMI, waist and blood pressure (p< 0.001) were higher than the womens. For both sexes, the majority referred light and moderate activities (81.2% of men and 86.6% of women). As far as work time is concerned, 87.8% of men classified their effort as light or moderate versus 96.1% of women. Distribution by PA levels showed that women were always less active than men (p= 0.01). Stratifying by the presence of MS, men and women with MS were significantly older and showed greater anthropometric values. Considering the walking duration for work, there was a tendency of shorter periods among those with MS (p< 0.078). As expected, subjects with MS showed significantly higher levels of blood pressure, plasma glucose, lipids and HOMA-IR when compared to those without MS. HDL levels were lower in the MS group, being significant for the female sex. The mean values of CRP were higher in subjects with MS. In logistic regression, age, BMI, HOMA-IR and CRP were shown to be independently associated with MS, but not parameters used to measure physical activity. Our findings do not allow to state that physical inactivity is associated with MS in a Japanese-Brazilian population. High frequencies of physical inactivity should have contributed to the negative findings concerning protective effects of physical activity. The association of MS and serum CRP favors the hypothesis that a low-grade inflammatory state may participate in this syndrome.

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