Independent and joint effects of sitting time with lifestyle factors on mortality, in post-menopausal, U.S. Women

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dc.contributor.advisorArdern, Chris
dc.creatorLee, Jasmine
dc.date.accessioned2016-09-13T13:13:44Z
dc.date.available2016-09-13T13:13:44Z
dc.date.copyright2013-07
dc.degree.disciplineKinesiology & Health Science
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractProlonged sitting has been linked to cardiovascular disease, diabetes, obesity, cancer and early mortality, independent of physical activity. As a result, it would be beneficial from a public health standpoint to examine the impact of sitting time amongst older populations who are prone to sitting. We grouped post-menopausal women of the Women's Health Initiative (n= 84 865; 50-79 years of age) into quartiles of total daily sitting time (Q1: <=5; Q2: 6-9; Q3: 10-13; Q4: 14+ hrs. /day). We also examined the joint effects of sitting time with other well-known risk factors on mortality. The two highest quartiles of sitting time had significantly higher all-cause (Q3: HR: 1.13, 95% CI: 1.04-1.22); (Q4: 1.26, 95% CI: 1.11-1.44) and cancer mortality (Q3: HR:1.17, 95% CI: 1.04-1.31 ); (Q4: 1.38, 95% CI: 1.13-1.67) risk in comparison to our referent group who sat less than or equal to 5 hours daily. Additionally, individuals who at baseline were smokers, or inactive in conjunction with high levels of sitting, were also at a considerably higher risk of all-cause and cancer mortality compared to women with a more optimal risk profile (non-smoker, or active and low sitting). These findings suggest that in older, post-menopausal women, limiting sitting time throughout the day may be a positive strategy to improve one's longevity. Further, high-risk individuals such as older women who exhibit high sitting with other behaviours such as, smoking, or inactivity should be of priority to limit sitting time.
dc.identifier.urihttp://hdl.handle.net/10315/31927
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subject.keywordsprolonged sitting
dc.subject.keywordssitting time
dc.subject.keywordslifestyle factors
dc.subject.keywordsmortality
dc.subject.keywordspost-menopausal women
dc.subject.keywordsdiseases
dc.subject.keywordsphysical activity
dc.subject.keywordsrisk factors
dc.titleIndependent and joint effects of sitting time with lifestyle factors on mortality, in post-menopausal, U.S. Women
dc.typeElectronic Thesis or Dissertation

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