title: Physical activity as a determinant of change in mobility performance: the Longitudinal Aging Study Amsterdam.
abstract: OBJECTIVE
  This study examined the association of (change in) physical activity and decline in mobility performance in older men and women.
  
  
  METHODS
  A 3-year prospective study using data of the Longitudinal Aging Study.
  
  
  METHODS
  Netherlands.
  
  
  METHODS
  Two thousand one hundred nine men and women aged 55 to 85.
  
  
  METHODS
  Total physical activity (expressed as hours per day and kilocalories per day) and sports participation were measured using a validated, interviewer-administered questionnaire. Mobility performance was assessed using two timed tests: 6-meter walk and repeated chair stands.
  
  
  RESULTS
  Mobility performance declined for 45.6% of the sample. At baseline, the mean time +/- standard deviation spent on total physical activity was 3.0 +/- 2.1 h/d or 719 +/- 543 kcal/d, and 56.6% of the sample participated in sports. Sports participation and a higher level of total physical activity, walking, or household activity were associated with a smaller mobility decline. After 3 years, total physical activity declined, and only 53.4% of those reporting sports at baseline continued doing so. Continuation of physical activity over time was associated with the smallest decline in mobility. The observed associations were similar for those with and without chronic disease (P> 0.3). The conclusions did not change after adjustment for potential confounders, including demographic and lifestyle variables, depression, and cognitive status.
  
  
  CONCLUSIONS
  Physical activity, and especially a regularly active lifestyle, may slow the decline in mobility performance. A beneficial effect was observed for sports and nonsports activities, independent of the presence of chronic disease.
authors.affiliation: Institute for Research in Extramural Medicine, VU University Medical Center, Amsterdam, the Netherlands. m.visser.emgo@med.vu.nl
authors.forename: Marjolein
authors.initials: M
authors.lastname: Visser
authors.forename: Saskia M F
authors.initials: SM
authors.lastname: Pluijm
authors.forename: Vianda S
authors.initials: VS
authors.lastname: Stel
authors.forename: Ruud J
authors.initials: RJ
authors.lastname: Bosscher
authors.forename: Dorly J H
authors.initials: DJ
authors.lastname: Deeg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D005260:Female; D006801:Humans; D008019:Life Style; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D009069:Movement Disorders / Q000503:physiopathology*; D009426:Netherlands; D011237:Predictive Value of Tests; D011446:Prospective Studies; D011597:Psychomotor Performance / Q000502:physiology*; D013997:Time Factors