title: Objective measurements of daily physical activity patterns and sedentary behaviour in older adults: Age, Gene/Environment Susceptibility-Reykjavik Study.
abstract: BACKGROUND
  objectively measured population physical activity (PA) data from older persons is lacking. The aim of this study was to describe free-living PA patterns and sedentary behaviours in Icelandic older men and women using accelerometer.
  
  
  METHODS
  from April 2009 to June 2010, 579 AGESII-study participants aged 73-98 years wore an accelerometer (Actigraph GT3X) at the right hip for one complete week in the free-living settings.
  
  
  RESULTS
  in all subjects, sedentary time was the largest component of the total wear time, 75%, followed by low-light PA, 21%. Moderate-vigorous PA (MVPA) was <1%. Men had slightly higher average total PA (counts × day(-1)) than women. The women spent more time in low-light PA but less time in sedentary PA and MVPA compared with men (P < 0.001). In persons <75 years of age, 60% of men and 34% of women had at least one bout ≥10 min of MVPA, which decreased with age, with only 25% of men and 9% of women 85 years and older reaching this.
  
  
  CONCLUSIONS
  sedentary time is high in this Icelandic cohort, which has high life-expectancy and is living north of 60° northern latitude.
authors.affiliation: Research Center of Movement Science, University of Iceland, Stapi v/Hringbraut, Reykjavík 101, Iceland. nya@hi.is
authors.forename: Nanna Yr
authors.initials: NY
authors.lastname: Arnardottir
authors.forename: Annemarie
authors.initials: A
authors.lastname: Koster
authors.forename: Dane R
authors.initials: DR
authors.lastname: Van Domelen
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Brychta
authors.forename: Paolo
authors.initials: P
authors.lastname: Caserotti
authors.forename: Gudny
authors.initials: G
authors.lastname: Eiriksdottir
authors.forename: Johanna Eyrun
authors.initials: JE
authors.lastname: Sverrisdottir
authors.forename: Lenore J
authors.initials: LJ
authors.lastname: Launer
authors.forename: Vilmundur
authors.initials: V
authors.lastname: Gudnason
authors.forename: Erlingur
authors.initials: E
authors.lastname: Johannsson
authors.forename: Tamara B
authors.initials: TB
authors.lastname: Harris
authors.forename: Kong Y
authors.initials: KY
authors.lastname: Chen
authors.forename: Thorarinn
authors.initials: T
authors.lastname: Sveinsson
mesh_terms: D056044:Actigraphy; D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000235:genetics; D015992:Body Mass Index; D005260:Female; D059647:Gene-Environment Interaction; D006801:Humans; D007055:Iceland; D057187:Independent Living; D008136:Longevity; D008297:Male; D009043:Motor Activity; D057185:Sedentary Behavior; D012737:Sex Factors; D013550:Swimming; D013997:Time Factors