Device-measured physical activity, adiposity and mortality: a harmonised meta-analysis of eight prospective cohort studies
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    RE: Device-measured physical activity, adiposity and mortality

    Tarp et al. evaluated the associations of total and intensity-specific physical activity and all-cause mortality (1). Compared with the obese-low total physical activity reference, the hazard ratios (HRs) (95% confidence intervals [CIs]) of subjects with normal weight-high total activity and obese-high total activity for mortality were 0.59 (0.44 to 0.79) 0.67 (0.48 to 0.94), respectively. In contrast, the HR (95% CI) of subjects with normal weight-low total physical activity for mortality was 1.28 (0.99 to 1.67). Physical activity has a preventive effect on mortality regardless of obesity, and I have some comments about the study with special reference to sedentary time and aging.

    Li et al. reported that the adjusted HRs (95% CIs) of daily sedentary time per 1 hour increase for all-cause mortality was 1.03 (1.01-1.05) and significant increase of the adjusted HR was observed in subjects with daily sedentary time of 8 or longer (2). This means that physically inactive lifestyle has an effect on increased risk in mortality, and physical activity and sedentary behaviour should be checked simultaneously. In addition, I suppose that the content of physical activity should be specified; such as leisure-time and work-related activity.

    Yang et al. conducted a meta-analysis to evaluate the effect of physical activity and sedentary behaviour over adulthood on all-cause and cause-specific mortality (3). They clarified that active subjects over adulthood was significantl...

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    Conflict of Interest:
    None declared.