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Verity Cleland, Michael Schmidt, Jo Salmon, Terry Dywer and Alison Venn

Background:

We investigated associations of total sedentary behavior (SB) and objectively-measured and self-reported physical activity (PA) with obesity.

Methods:

Data from 1662 adults (26–36 years) included daily steps, self-reported PA, sitting, and waist circumference. SB and PA were dichotomized at the median, then 2 variables created (SB/self-reported PA; SB/objectively-measured PA) each with 4 categories: low SB/high PA (reference group), high SB/high PA, low SB/low PA, high SB/low PA.

Results:

Overall, high SB/low PA was associated with 95 –168% increased obesity odds. Associations were stronger and more consistent for steps than self-reported PA for men (OR 2.68, 95% CI 1.36–5.32 and OR 1.95, 95% CI 1.01–3.79, respectively) and women (OR 2.66, 95% CI 1.58–4.49 and OR 2.00, 95% CI 1.21–3.31, respectively). Among men, obesity was higher when daily steps were low, irrespective of sitting (low SB/low steps OR 2.07, 95% CI 1.03–4.17; high SB/low steps OR 2.68, 95% CI 1.36–5.32).

Conclusions:

High sitting and low activity increased obesity odds among adults. Irrespective of sitting, men with low step counts had increased odds of obesity. The findings highlight the importance of engaging in physical activity and limiting sitting.

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Murielle Grangeon, Cindy Gauthier, Cyril Duclos, Jean-Francois Lemay and Dany Gagnon

The study aimed to (1) compare postural stability between sitting and standing in healthy individuals and (2) define center-of-pressure (COP) measures during sitting that could also explain standing stability. Fourteen healthy individuals randomly maintained (1) two short-sitting positions with eyes open or closed, with or without hand support, and (2) one standing position with eyes open with both upper limbs resting alongside the body. Thirty-six COP measures based on time and frequency series were computed. Greater COP displacement and velocity along with lower frequency measures were found for almost all directional components during standing compared with both sitting positions. The velocity, 95% confidence ellipse area, and centroidal frequency were found to be correlated between unsupported sitting and standing. Despite evidenced differences between sitting and standing, similarities in postural control were highlighted when sitting stability was the most challenging. These findings support further investigation between dynamic sitting and standing balance.

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Joan E. Deffeyes, Regina T. Harbourne, Wayne A. Stuberg and Nicholas Stergiou

Sitting is one of the first developmental milestones that an infant achieves. Thus measurements of sitting posture present an opportunity to assess sensorimotor development at a young age. Sitting postural sway data were collected using a force plate, and the data were used to train a neural network controller of a model of sitting posture. The trained networks were then probed for sensitivity to position, velocity, and acceleration information at various time delays. Infants with typical development developed a higher reliance on velocity information in control in the anterior-posterior axis, and used more types of information in control in the medial-lateral axis. Infants with delayed development, where the developmental delay was due to cerebral palsy for most of the infants in the study, did not develop this reliance on velocity information, and had less reliance on short latency control mechanisms compared with infants with typical development.

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Sheri J. Hartman, Catherine R. Marinac, Lisa Cadmus-Bertram, Jacqueline Kerr, Loki Natarajan, Suneeta Godbole, Ruth E. Patterson, Brittany Morey and Dorothy D. Sears

, 6 – 8 more recent evidence points to sedentary behavior as a novel yet understudied predictor of health outcomes—even after adjusting for physical activity. 9 Sedentary activities are commonly defined as those with a low energy expenditure (<1.5 metabolic equivalents) and performed in a sitting or

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Katie Weatherson, Lira Yun, Kelly Wunderlich, Eli Puterman and Guy Faulkner

Sedentary behavior (SB), defined as “any waking behavior characterized by an energy expenditure of ≤1.5 metabolic equivalents while in a sitting, reclining, or lying posture,” is a risk factor for poor health, independent of moderate to vigorous physical activity (PA). 1 High levels of SB and

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Stephanie Alley, Jannique G.Z. van Uffelen, Mitch J. Duncan, Katrien De Cocker, Stephanie Schoeppe, Amanda L. Rebar and Corneel Vandelanotte

Prolonged sitting is detrimental to the health of older adults aged 65+ years ( Wullems, Verschueren, Degens, Morse, & Onambele, 2016 ). A recent review found that prolonged sitting leads to a range of health problems in older adults, including chronic disease, musculoskeletal problems, low

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Amber Watts, Mauricio Garnier-Villarreal and Paul Gardiner

A recent consensus project by the Sedentary Behaviour Research Network ( Tremblay et al., 2017 ) defines sedentary behavior as any waking behavior characterized by an energy expenditure of ≤1.5 metabolic equivalents (METs), while in a sitting, reclining, or lying posture. This definition emphasizes

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Nicholas D. Gilson, Caitlin Hall, Andreas Holtermann, Allard J. van der Beek, Maaike A. Huysmans, Svend Erik Mathiassen and Leon Straker

sitting, or the daily accumulation of light- (1.6–2.9 METs) and moderate-intensity (3.0–5.9 METs) movement, such as slow or brisk walking, which occurs through occupational physical activity (PA). 3 Work design 4 and the sociocultural norms that characterize work environments 5 are recognized as major

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Katherine L. Downing, Jo Salmon, Anna Timperio, Trina Hinkley, Dylan P. Cliff, Anthony D. Okely and Kylie D. Hesketh

Sedentary behavior refers to activities undertaken in a sitting or lying position and requiring minimal energy expenditure, 1 for example, sitting down watching television (TV) or reading. There is increasing evidence that sedentary behavior, particularly sedentary screen time, is associated with

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Akio Kubota, Alison Carver and Takemi Sugiyama

physical activity, sedentary behavior, defined as any waking behavior in a sitting or reclining posture involving an energy expenditure ≤1.5 metabolic equivalents ( Owen, Bauman, & Brown, 2009 ), has emerged as a distinctive behavior detrimentally associated with health ( Owen, Healy, Matthews, & Dunstan