title: Non-exercise physical activity and survival: English longitudinal study of ageing.
abstract: BACKGROUND
  The activity patterns of older adults include more light/mild-intensity or "non-exercise" activity and less moderate- to vigorous-intensity activity. The health benefits of this type of activity pattern remain unclear.
  
  
  OBJECTIVE
  To examine dose-response associations between physical activity and survival using time-varying analysis to understand the importance of "non-exercise" activity for survival in older adults.
  
  
  METHODS
  Participants (N=10,426) were drawn from The English Longitudinal Study of Ageing, a representative sample of men and women aged ≥50 years living in England. Participant data were linked with death records from the National Health Service registries from 2002 to 2011. Analyses were conducted in 2013. Cox proportional hazards models were used to estimate the risk of death according to time-varying estimates of physical activity.
  
  
  RESULTS
  Over an average follow-up of 7.8 years (median follow-up, 8.5 years), there were 1,896 deaths. In models adjusted for comorbidities, psychosocial factors, smoking, and obesity, there was a dose-response association between time-varying physical activity and mortality, with the greatest survival benefit in vigorously active participants. However, participating in mild ("non-exercise")-intensity physical activity was also associated with a lower risk of all-cause mortality (hazard ratio [HR]=0.76, 95% CI=0.69, 0.83); cardiovascular mortality (HR=0.74, 95% CI=0.64, 0.85); and death by other causes (HR=0.67, 95% CI=0.58, 0.78). Time-varying models produced stronger, more robust estimates than models using a single measurement of physical activity at baseline.
  
  
  CONCLUSIONS
  Older adults gain health benefits from participating in regular "non-exercise" physical activity, although the greatest benefits are observed for more vigorous activity.
authors: Department of Epidemiology and Public Health, University College London, London, United Kingdom. Electronic address: m.hamer@ucl.ac.uk.
authors: Mark
authors: M
authors: Hamer
authors: Department of Epidemiology and Public Health, University College London, London, United Kingdom.
authors: Cesar
authors: C
authors: de Oliveira
authors: Department of Epidemiology and Public Health, University College London, London, United Kingdom.
authors: Panayotes
authors: P
authors: Demakakos
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D016016:Proportional Hazards Models; D016019:Survival Analysis; D013997:Time Factors