title: Moving through Life-Space Areas and Objectively Measured Physical Activity of Older People.
abstract: OBJECTIVE
  Physical activity-an important determinant of health and function in old age-may vary according to the life-space area reached. Our aim was to study how moving through greater life-space areas is associated with greater physical activity of community-dwelling older people. The association between objectively measured physical activity and life-space area reached on different days by the same individual was studied using one-week longitudinal data, to provide insight in causal relationships.
  
  
  METHODS
  One-week surveillance of objectively assessed physical activity of community-dwelling 70-90-year-old people in central Finland from the "Life-space mobility in old age" cohort substudy (N = 174). In spring 2012, participants wore an accelerometer for 7 days and completed a daily diary including the largest life-space area reached (inside home, outside home, neighborhood, town, and beyond town). The daily step count, and the time in moderate (incl. walking) and low activity and sedentary behavior were assessed. Differences in physical activity between days on which different life-space areas were reached were tested using Generalized Estimation Equation models (within-group comparison).
  
  
  RESULTS
  Participants' mean age was 80.4±4.2 years and 63.5% were female. Participants had higher average step counts (p < .001) and greater moderate and low activity time (p < .001) on days when greater life-space areas were reached, from the home to the town area. Only low activity time continued to increase when moving beyond the town.
  
  
  CONCLUSIONS
  Community-dwelling older people were more physically active on days when they moved through greater life-space areas. While it is unknown whether physical activity was a motivator to leave the home, intervention studies are needed to determine whether facilitation of daily outdoor mobility, regardless of the purpose, may be beneficial in terms of promoting physical activity.
authors.affiliation: Gerontology Research Center and Department of Health Sciences, University of Jyvaskyla, Jyväskylä, Finland.
authors.forename: Erja
authors.initials: E
authors.lastname: Portegijs
authors.affiliation: Gerontology Research Center and Department of Health Sciences, University of Jyvaskyla, Jyväskylä, Finland.
authors.forename: Li-Tang
authors.initials: LT
authors.lastname: Tsai
authors.affiliation: Gerontology Research Center and Department of Health Sciences, University of Jyvaskyla, Jyväskylä, Finland.
authors.forename: Taina
authors.initials: T
authors.lastname: Rantanen
authors.affiliation: Gerontology Research Center and Department of Health Sciences, University of Jyvaskyla, Jyväskylä, Finland.
authors.forename: Merja
authors.initials: M
authors.lastname: Rantakokko
mesh_terms: D061725:Accelerometry; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging; D015331:Cohort Studies; D005260:Female; D005387:Finland; D006801:Humans; D008019:Life Style; D008297:Male; D009043:Motor Activity; D015203:Reproducibility of Results; D012111:Residence Characteristics; D065854:Spatial Navigation; D016138:Walking