The Evolving Definition of "Sedentary"

Department of Exercise Science, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA.
Exercise and sport sciences reviews (Impact Factor: 4.82). 11/2008; 36(4):173-8. DOI: 10.1097/JES.0b013e3181877d1a
Source: PubMed

ABSTRACT Studies that did not directly measure sedentary behavior often have been used to draw conclusions about the health effects of sedentariness. Future claims about the effects of sedentary, light, and moderate-to-vigorous activities on health outcomes should be supported by data from studies in which all levels of physical activity are differentiated clearly and measured independently.

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Available from: Felipe Lobelo, Mar 13, 2014
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    • "Ainsi, des seuils ont été déterminés et sont assez communément acceptés (synthèse sur la Fig. 2). Les activités et comportements sont qualifiés de sédentaires quand la sollicitation requise est strictement inférieure à 1,6 MET [27]. Ils comprennent alors exclusivement des activités au cours desquelles la personne est quasiment immobile, couchée ou assise. "
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    ABSTRACT: For physical activity promotion to be effective from a public health view, adequate communication between the different actors is required. In this perspective, we propose to explicit the bioenergetic notions used to quantify and qualify intensity of physical activities, physical activity and sedentary behaviors, and lifestyles. Public health recommendations for physical activity in healthy adults from different authorities vary between 675 and 1350 METs/min per week, which, for example, is the equivalent of the energy spent with the participation 5 times per week in activities leading to a 4.5-times increase of the basal metabolic rate during 30 or 60 minutes for the low and high limit, respectively. For every population category, researchers in different scientific fields and all various responsible actors must work harder or better to reach successful physical activity promotion that would be evidenced by rarefaction of sedentary lifestyles. Very different lifestyles are compatible with energy expenditure large enough at a population scale to contribute to the prevention and control of many non-communicable diseases.
    Nutrition Clinique et Métabolisme 05/2015; 29(2). DOI:10.1016/j.nupar.2015.04.001 · 0.62 Impact Factor
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    • "About 10 years ago, the term sedentary behavior (SB) was often used to describe a lack of physical activity including also activities of low intensity (Pate et al., 2008). But in contrast to physical inactivity, SB is defined more appropriately as a distinct behavioral category comprising exclusively activities that do not substantially increase energy expenditure compared to resting level (Sedentary Behaviour Research Network, 2012; Pate et al., 2008). In the past few years, the amount of time spent in SB has emerged as an important and independent risk factor for children's and adolescents' physical health, additionally to the level of physical activity. "
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    ABSTRACT: The presented systematic review aims at giving a comprehensive overview of studies assessing the relationship between sedentary behavior and indicators of mental health in school-aged children and adolescents. Six online databases (MEDLINE, EMBASE, PsycINFO, PsycARTICLES, CINAHL and SPORTDiscus) as well as personal libraries and reference lists of existing literature were searched for eligible studies. Ninety-one studies met all inclusion criteria. There was strong evidence that high levels of screen time were associated with more hyperactivity/inattention problems and internalizing problems as well as with less psychological well-being and perceived quality of life. Concerning depressive symptoms, self-esteem, eating disorder symptoms, and anxiety symptoms, no clear conclusion could be drawn. But, taking quality assessment into account, self-esteem was negatively associated with sedentary behavior, i.e. high levels of time engaging in screen-based sedentary behavior were linked to lower scores in self-esteem. Overall, the association between sedentary behavior and mental health indicators was rather indeterminate. Future studies of high quality and with an objective measure of sedentary behavior will be necessary to further examine this association as well as to investigate longitudinal relationships and the direction of causality. Furthermore, more studies are needed to identify moderating and mediating variables. Copyright © 2015. Published by Elsevier Inc.
    Preventive Medicine 04/2015; 76. DOI:10.1016/j.ypmed.2015.03.026 · 2.93 Impact Factor
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    • "Total minutes b 100 counts/min (Healy et al., 2008; Matthews et al., 2008; Pate et al., 2008). "
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    ABSTRACT: Objective: Low physical activity and high sedentary behaviour levels are major concerns in persons with multiple sclerosis (MS) and these differ depending on the level of mobility disability. However, the manner in which daily activity is accumulated is currently unknown in this population. Methods: A secondary analysis was performed on a combined data set of persons with MS from two previous investigations of physical activity and symptomatic or quality of life outcomes in the United States over a two year period (2007-2009). Mobility disability status was determined using the Patient Determined Disease Steps (PDDS) while activity behaviour was objectively monitored using ActiGraph accelerometer for 7 days. Results: Persons with MS who have mobility disability were involved in sedentary behaviour, light and moderate intensity activity for 65%, 34% and 1% of the day, respectively compared to 60%, 37%, and 3%, respectively in those without mobility disability (p < 0.05). Breaks in sedentary time did not differ by mobility disability status. Compared to those without mobility disability, the average number of sedentary bouts longer than 30 minutes was greater in those with mobility disability (p= 0.016). Conclusion: Persons with MS with mobility disability are less active, engage in more sedentary behaviour and accumulate prolonged sedentary bouts.
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