Sedentary behavior and health outcomes: an overview of systematic reviews

1) To synthesize the current observational evidence for the association between sedentary behavior and health outcomes using information from systematic reviews. 2) To assess the methodological quality of the systematic reviews found. Medline; Excerpta Medica (Embase); PsycINFO; and Web of Science w...

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Published in:	PloS one Vol. 9; no. 8; p. e105620
Main Authors:	de Rezende, Leandro Fornias Machado, Rodrigues Lopes, Maurício, Rey-López, Juan Pablo, Matsudo, Victor Keihan Rodrigues, Luiz, Olinda do Carmo
Format:	Journal Article
Language:	English
Published:	United States Public Library of Science 21-08-2014 Public Library of Science (PLoS)
Subjects:	Activities of Daily Living Adolescent Adolescents Adult Adults Age Behavior Biology and Life Sciences Blood pressure Cardiovascular disease Cardiovascular diseases Children Cholesterol Citation management software Colon Diabetes Diabetes mellitus Diabetes mellitus (non-insulin dependent) Endometrial cancer Endometrium Epidemiology Exercise Female Fitness Health aspects Health risk assessment Health Status Humans Information systems Literature reviews Male Medicine and Health Sciences Meta-analysis Metabolic disorders Metabolic syndrome Mortality Obesity Physical activity Physical fitness Quality Quality assessment Research and Analysis Methods Reviews Sedentary behavior Sedentary Lifestyle Social behavior Social Sciences Systematic review Systematics Teenagers Type 2 diabetes
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Summary:	1) To synthesize the current observational evidence for the association between sedentary behavior and health outcomes using information from systematic reviews. 2) To assess the methodological quality of the systematic reviews found. Medline; Excerpta Medica (Embase); PsycINFO; and Web of Science were searched for reviews published up to September 2013. Additional publications were provided by Sedentary Behaviour Research Network members. The methodological quality of the systematic reviews was evaluated using recommended standard criteria from AMSTAR. For each review, improper use of causal language in the description of their main results/conclusion was evaluated. Altogether, 1,044 review titles were identified, 144 were read in their entirety, and 27 were included. Based on the systematic reviews with the best methodological quality, we found in children and adolescents, strong evidence of a relationship between time spent in sedentary behavior and obesity. Moreover, moderate evidence was observed for blood pressure and total cholesterol, self-esteem, social behavior problems, physical fitness and academic achievement. In adults, we found strong evidence of a relationship between sedentary behavior and all-cause mortality, fatal and non-fatal cardiovascular disease, type 2 diabetes and metabolic syndrome. In addition, there is moderate evidence for incidence rates of ovarian, colon and endometrial cancers. This overview based on the best available systematics reviews, shows that sedentary behavior may be an important determinant of health, independently of physical activity. However, the relationship is complex because it depends on the type of sedentary behavior and the age group studied. The relationship between sedentary behavior and many health outcomes remains uncertain; thus, further studies are warranted.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-3 content type line 23 ObjectType-Review-1 Competing Interests: The authors have declared that no competing interests exist. Conceived and designed the experiments: LFMR ML JPRL VKRM OCL. Performed the experiments: LFMR ML JPRL VKRM OCL. Analyzed the data: LFMR ML JPRL. Contributed reagents/materials/analysis tools: LFMR ML JPRL. Wrote the paper: LFMR ML JPRL VKRM OCL.
ISSN:	1932-6203 1932-6203
DOI:	10.1371/journal.pone.0105620