Associations of discretionary screen time with mortality, cardiovascular disease and cancer are attenuated by strength, fitness and physical activity: findings from the UK Biobank study
Carlos Celis-Morales,Donald M. Lyall,Lewis Steell,Stuart R. Gray,Stamatina Iliodromiti,Jana Anderson,Daniel F. Mackay,Paul Welsh,Thomas Yates,Thomas Yates,Jill P. Pell,Naveed Sattar,Jason M.R. Gill +12 more
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TLDR
If these associations are causal, the greatest benefits from health promotion interventions to reduce discretionary screen time may be seen in those with low levels of strength, fitness and physical activity.Abstract:
Discretionary screen time (time spent viewing a television or computer screen during leisure time) is an important contributor to total sedentary behaviour, which is associated with increased risk of mortality and cardiovascular disease (CVD). The aim of this study was to determine whether the associations of screen time with cardiovascular disease and all-cause mortality were modified by levels of cardiorespiratory fitness, grip strength or physical activity. In total, 390,089 participants (54% women) from the UK Biobank were included in this study. All-cause mortality, CVD and cancer incidence and mortality were the main outcomes. Discretionary television (TV) viewing, personal computer (PC) screen time and overall screen time (TV + PC time) were the exposure variables. Grip strength, fitness and physical activity were treated as potential effect modifiers. Altogether, 7420 participants died, and there were 22,210 CVD events, over a median of 5.0 years follow-up (interquartile range 4.3 to 5.7; after exclusion of the first 2 years from baseline in the landmark analysis). All discretionary screen-time exposures were significantly associated with all health outcomes. The associations of overall discretionary screen time with all-cause mortality and incidence of CVD and cancer were strongest amongst participants in the lowest tertile for grip strength (all-cause mortality hazard ratio per 2-h increase in screen time (1.31 [95% confidence interval: 1.22–1.43], p < 0.0001; CVD 1.21 [1.13–1.30], p = 0.0001; cancer incidence 1.14 [1.10–1.19], p < 0.0001) and weakest amongst those in the highest grip-strength tertile (all-cause mortality 1.04 [0.95–1.14], p = 0.198; CVD 1.05 [0.99–1.11], p = 0.070; cancer 0.98 [0.93–1.05], p = 0.771). Similar trends were found for fitness (lowest fitness tertile: all-cause mortality 1.23 [1.13–1.34], p = 0.002 and CVD 1.10 [1.02–1.22], p = 0.010; highest fitness tertile: all-cause mortality 1.12 [0.96–1.28], p = 0.848 and CVD 1.01 [0.96–1.07], p = 0.570). Similar findings were found for physical activity for all-cause mortality and cancer incidence. The associations between discretionary screen time and adverse health outcomes were strongest in those with low grip strength, fitness and physical activity and markedly attenuated in those with the highest levels of grip strength, fitness and physical activity. Thus, if these associations are causal, the greatest benefits from health promotion interventions to reduce discretionary screen time may be seen in those with low levels of strength, fitness and physical activity.read more
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Objectively-Assessed Physical Activity, Sedentary Behavior, Smartphone Use, and Sleep Patterns Pre- and during-COVID-19 Quarantine in Young Adults from Spain
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Fei Qin,Yiqing Song,George P. Nassis,George P. Nassis,Lina Zhao,Yanan Dong,Cuicui Zhao,Yiwei Feng,Jiexiu Zhao +8 more
TL;DR: Wang et al. as discussed by the authors evaluated the effects of the COVID-19 lock-down on lifestyle in China during the initial stage of the pandemic and found that more than half of Chinese adults temporarily adopted a sedentary lifestyle with insufficient physical activity, more screen time, and poor emotional state, which may carry considerable health risks.
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Working From Home and Job Loss Due to the COVID-19 Pandemic Are Associated With Greater Time in Sedentary Behaviors.
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TL;DR: COVID-19 related employment changes were associated with greater sitting and screen time, which is a public health concern as sedentary time is consistently negatively associated with current and future health and wellbeing.
Journal ArticleDOI
Dose-response associations of cardiorespiratory fitness with all-cause mortality and incidence and mortality of cancer and cardiovascular and respiratory diseases: the UK Biobank cohort study.
Lewis Steell,Frederick K. Ho,Anne Sillars,Fanny Petermann-Rocha,Fanny Petermann-Rocha,Hiu Li,Donald M. Lyall,Stamatina Iliodromiti,Paul Welsh,Jana Anderson,Daniel F. Mackay,Jill P. Pell,Naveed Sattar,Jason M.R. Gill,Stuart R. Gray,Carlos Celis-Morales +15 more
TL;DR: Higher cardiorespiratory fitness was associated with lower risk of premature mortality and incidence of CVD, respiratory disease and colorectal cancer, and nonlinear analysis revealed that a high level of fitness wasassociated with a greater incidence of atrial fibrillation and prostate cancer.
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