Television Viewing Time and 13-year Mortality in Adults with Cardiovascular Disease: Data from the Australian Diabetes, Obesity and Lifestyle Study (AusDiab).
BACKGROUND
In the general population, excessive sedentary behaviour is associated with increased all-cause mortality. Few studies have examined this relationship in people with cardiovascular disease (CVD). Using a sample of people with CVD who were excluded from an analysis of the Australian Diabetes, Obesity and Lifestyle (AusDiab) study, we examined the relationship between sedentary behaviour and 13-year all-cause mortality.


METHODS
In the original AusDiab study, television viewing time was used as a marker of sedentary behaviour in 609 adults (≥45 years of age) with CVD. During 6,291 person-years of follow-up (median follow-up 13 years), there were 294 deaths (48% of sample). Using the time scale of attained age, the Cox proportional hazards model predicting all-cause mortality adjusted for sex, self-rated general health, leisure-time physical activity, smoking status, education, household income, body mass index, lipid levels, blood pressure, and diabetes mellitus was used.


RESULTS
Compared with a TV viewing time of <2hours per day, the fully adjusted hazard ratios for all-cause mortality were 1.18 (95% CI, 0.88 to 1.57) for ≥2 to <4hours per day and 1.52 (95% CI, 1.09 to 2.13) for >4hours per day.


CONCLUSIONS
Sedentary behaviour was associated with increased risk of all-cause mortality in people with CVD, independent of physical activity and other confounders. In addition to the promotion of regular physical activity, cardiac rehabilitation efforts which also focus on reducing sedentary behaviour may be beneficial.
Australian Centre for Heart Health, Melbourne, Vic., Australia. Electronic address: michelle.rogerson@heartresearchcentre.org.
Michelle C
MC
Rogerson
Australian Centre for Heart Health, Melbourne, Vic., Australia; Deakin University, Faculty of Health, Melbourne, Vic., Australia.
Michael R
MR
Le Grande
Baker IDI Heart and Diabetes Institute, Melbourne, Vic., Australia; Australian Catholic University, Mary MacKillop Institute for Health Research, Melbourne, Vic., Australia; The University of Queensland, School of Public Health, Brisbane, Qld., Australia; Deakin University, School of Exercise and Nutrition Sciences, Melbourne, Vic., Australia; The University of Western Australia, School of Sport Science, Exercise and Health, Perth, WA, Australia; Monash University, Department of Medicine, Monash University, Melbourne, Vic., Australia; Monash University, Department of Epidemiology and Preventive Medicine, Melbourne, Vic., Australia.
David W
DW
Dunstan
Baker IDI Heart and Diabetes Institute, Melbourne, Vic., Australia.
Dianna J
DJ
Magliano
Australian Centre for Heart Health, Melbourne, Vic., Australia; Deakin University, Faculty of Health, Melbourne, Vic., Australia; University of Melbourne, Department of Psychology, Melbourne, Vic., Australia; University of Newcastle School of Medicine & Public Health, Newcastle, NSW, Australia.
Barbara M
BM
Murphy
Deakin University, Centre for Physical Activity and Nutrition Research, Melbourne, Vic., Australia.
Jo
J
Salmon
The University of Queensland, School of Public Health, Brisbane, Qld., Australia; The University of Queensland, Mater Research Institute, Brisbane, Qld., Australia.
Paul A
PA
Gardiner
Australian Centre for Heart Health, Melbourne, Vic., Australia; Deakin University, Office of the Pro Vice Chancellor (Health), Melbourne, Vic., Australia; University of Hong Kong, Centre on Behavioural Health, Hong Kong.
Alun C
AC
Jackson
D000328:Adult; D000368:Aged; D001315:Australia / Q000453:epidemiology; D002318:Cardiovascular Diseases / Q000401:mortality / Q000503:physiopathology; D003920:Diabetes Mellitus / Q000401:mortality / Q000503:physiopathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007899:Leisure Activities; D008019:Life Style; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000401:mortality / Q000503:physiopathology; D013690:Television
Cardiovascular disease; Mortality; Prevalence; Risk factors; Sedentary behaviour