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      Epidemiology of physical inactivity, sedentary behaviors, and unhealthy eating habits among brazilian adolescents Translated title: Epidemiologia da inatividade física, comportamentos sedentários e hábitos alimentares não-saudáveis em adolescentes brasileiros

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          Abstract

          This systematic review analyzed the prevalence of physical inactivity, sedentary behaviors and unhealthy eating habits among Brazilian adolescents. Searches were conducted in five databases (Lilacs, SciELO, Medline, Web of Science, and Google Scholar) and in the references cited in the articles retrieved. The literature search yielded 5,872 potentially relevant titles and a total of 69 studies met all the inclusion criteria. The risk behavior most often evaluated was physical inactivity (48/69; 69.6%), and its prevalence rate ranged from 2.3% to 93.5%. Twenty-eight studies estimated the prevalence of physical inactivity at over 50%. Most studies observed the prevalence of greater physical inactivity among girls. The prevalence of sedentary behaviors (lengthy screen time or TV use) was also frequently over 50%. Several variables were used to identify unhealthy eating habits, and some criteria/studies have indicated unhealthy eating habit estimates at close to 100% among adolescents. In conclusion, the estimates of these risk behaviors among Brazilians adolescents were very close to or even greater than those found in developed countries in several studies analyzed in this review.

          Translated abstract

          Esta revisão sistemática analisou a prevalência de inatividade física, comportamentos sedentários e hábitos alimentares não-saudáveis em adolescentes brasileiros. Buscas foram realizadas em cinco bases de dados (Lilacs, SciELO, Medline, Web of Science e o Google Scholar) e nas referências dos artigos recuperados. A pesquisa bibliográfica rendeu 5.872 títulos potencialmente relevantes; 69 estudos preencheram todos os critérios de inclusão. O comportamento de risco mais frequentemente avaliado foi a inatividade física (48/69; 69,6%), e sua taxa de prevalência variou de 2,3% a 93,5%. Vinte e oito estudos estimaram taxas de inatividade física acima de 50%. A maioria dos estudos indicou taxas de inatividade física superiores entre meninas. As prevalências de comportamentos sedentários (elevado tempo de tela ou usando TV) também esteviveram, frequentemente, acima de 50%. Diversas variáveis foram utilizadas para a definição de hábitos alimentares não saudáveis , e alguns critérios têm indicado estimativas próximas a 100%. Em conclusão, diversos estudos analisados nesta revisão apontaram estimativas de comportamentos de risco em adolescentes brasileiros muito próximas, ou até superiores, às obtidas em países desenvolvidos.

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          Sedentary behaviors and subsequent health outcomes in adults a systematic review of longitudinal studies, 1996-2011.

          To systematically review and provide an informative synthesis of findings from longitudinal studies published since 1996 reporting on relationships between self-reported sedentary behavior and device-based measures of sedentary time with health-related outcomes in adults. Studies published between 1996 and January 2011 were identified by examining existing literature reviews and by systematic searches in Web of Science, MEDLINE, PubMed, and PsycINFO. English-written articles were selected according to study design, targeted behavior, and health outcome. Forty-eight articles met the inclusion criteria; of these, 46 incorporated self-reported measures including total sitting time; TV viewing time only; TV viewing time and other screen-time behaviors; and TV viewing time plus other sedentary behaviors. Findings indicate a consistent relationship of self-reported sedentary behavior with mortality and with weight gain from childhood to the adult years. However, findings were mixed for associations with disease incidence, weight gain during adulthood, and cardiometabolic risk. Of the three studies that used device-based measures of sedentary time, one showed that markers of obesity predicted sedentary time, whereas inconclusive findings have been observed for markers of insulin resistance. There is a growing body of evidence that sedentary behavior may be a distinct risk factor, independent of physical activity, for multiple adverse health outcomes in adults. Prospective studies using device-based measures are required to provide a clearer understanding of the impact of sedentary time on health outcomes. Copyright © 2011 American Journal of Preventive Medicine. Published by Elsevier Inc. All rights reserved.
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            Television viewing time and mortality: the Australian Diabetes, Obesity and Lifestyle Study (AusDiab).

            Television viewing time, the predominant leisure-time sedentary behavior, is associated with biomarkers of cardiometabolic risk, but its relationship with mortality has not been studied. We examined the associations of prolonged television viewing time with all-cause, cardiovascular disease (CVD), cancer, and non-CVD/noncancer mortality in Australian adults. Television viewing time in relation to subsequent all-cause, CVD, and cancer mortality (median follow-up, 6.6 years) was examined among 8800 adults > or =25 years of age in the Australian Diabetes, Obesity and Lifestyle Study (AusDiab). During 58 087 person-years of follow-up, there were 284 deaths (87 CVD deaths, 125 cancer deaths). After adjustment for age, sex, waist circumference, and exercise, the hazard ratios for each 1-hour increment in television viewing time per day were 1.11 (95% confidence interval [CI], 1.03 to 1.20) for all-cause mortality, 1.18 (95% CI, 1.03 to 1.35) for CVD mortality, and 1.09 (95% CI, 0.96 to 1.23) for cancer mortality. Compared with a television viewing time of or =2 to or =4 h/d. For CVD mortality, corresponding hazard ratios were 1.19 (95% CI, 0.72 to 1.99) and 1.80 (95% CI, 1.00 to 3.25). The associations with both cancer mortality and non-CVD/noncancer mortality were not significant. Television viewing time was associated with increased risk of all-cause and CVD mortality. In addition to the promotion of exercise, chronic disease prevention strategies could focus on reducing sitting time, particularly prolonged television viewing.
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              Association between child and adolescent television viewing and adult health: a longitudinal birth cohort study.

              Watching television in childhood and adolescence has been linked to adverse health indicators including obesity, poor fitness, smoking, and raised cholesterol. However, there have been no longitudinal studies of childhood viewing and adult health. We explored these associations in a birth cohort followed up to age 26 years. We assessed approximately 1000 unselected individuals born in Dunedin, New Zealand, in 1972-73 at regular intervals up to age 26 years. We used regression analysis to investigate the associations between earlier television viewing and body-mass index, cardiorespiratory fitness (maximum aerobic power assessed by a submaximal cycling test), serum cholesterol, smoking status, and blood pressure at age 26 years. Average weeknight viewing between ages 5 and 15 years was associated with higher body-mass indices (p=0.0013), lower cardiorespiratory fitness (p=0.0003), increased cigarette smoking (p<0.0001), and raised serum cholesterol (p=0.0037). Childhood and adolescent viewing had no significant association with blood pressure. These associations persisted after adjustment for potential confounding factors such as childhood socioeconomic status, body-mass index at age 5 years, parental body-mass index, parental smoking, and physical activity at age 15 years. In 26-year-olds, population-attributable fractions indicate that 17% of overweight, 15% of raised serum cholesterol, 17% of smoking, and 15% of poor fitness can be attributed to watching television for more than 2 h a day during childhood and adolescence. Television viewing in childhood and adolescence is associated with overweight, poor fitness, smoking, and raised cholesterol in adulthood. Excessive viewing might have long-lasting adverse effects on health.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                csc
                Ciência & Saúde Coletiva
                Ciênc. saúde coletiva
                ABRASCO - Associação Brasileira de Saúde Coletiva (Rio de Janeiro )
                1413-8123
                January 2014
                : 19
                : 1
                : 173-194
                Article
                S1413-81232014000100173
                10.1590/1413-81232014191.0446
                24473615
                f4721c1f-204c-467e-a95f-36f167fdb81c

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielosp.org/scielo.php?script=sci_serial&pid=1413-8123&lng=en
                Categories
                Health Policy & Services

                Public health
                Risk factors,Sedentary lifestyle,Eating behavior,Adolescent,Review,Fatores de risco,Estilo de vida sedentário,Comportamento alimentar,Jovem,Revisão

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