title: Associations of Sedentary Time and Breaks in Sedentary Time With Disability in Instrumental Activities of Daily Living in Community-Dwelling Older Adults.
abstract: BACKGROUND
  This cross-sectional study was performed to examine associations of objectively measured sedentary time (ST) and breaks in sedentary time (BST) with instrumental activities of daily living (IADL) disability in Japanese community-dwelling older adults.
  
  
  METHODS
  The sample comprised 1634 older adults (mean age: 73.3 y, men: 38.4%). Sedentary behavior was measured using a triaxial accelerometer. Disability was defined as inability in at least 1 of the IADL tasks using the Tokyo Metropolitan Institute of Gerontology Index of Competence.
  
  
  RESULTS
  After adjusting for potential confounders and moderate-to-vigorous physical activity (MVPA), longer ST was significantly associated with higher likelihood of IADL disability, whereas a greater number of BST was associated with lower likelihood of IADL disability. ST and BST remained statistically significant after mutual adjustment with odds ratio of 1.30 (95% confidence interval [CI)], 1.00-1.70) and 0.80 (95% CI, 0.65-0.99), respectively.
  
  
  CONCLUSIONS
  This study first demonstrated that shorter ST and more BST were associated with lower risk of IADL disability independent of MVPA and that the association for ST was independent of BST and vice versa. These findings suggest not only total ST but also the manner in which it is accumulated may contribute to the maintenance of functional independence in older adults.
authors.affiliation: Dept of Behavior and Health Sciences, Graduate School of Human-Environment Studies, Kyushu University, Fukuoka, Japan.
authors.forename: Tao
authors.initials: T
authors.lastname: Chen
authors.forename: Kenji
authors.initials: K
authors.lastname: Narazaki
authors.forename: Yuka
authors.initials: Y
authors.lastname: Haeuchi
authors.forename: Sanmei
authors.initials: S
authors.lastname: Chen
authors.forename: Takanori
authors.initials: T
authors.lastname: Honda
authors.forename: Shuzo
authors.initials: S
authors.lastname: Kumagai
mesh_terms: D061725:Accelerometry; D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000208:ethnology*; D003430:Cross-Sectional Studies; D006233:Persons with Disabilities; D005260:Female; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D007564:Japan; D016015:Logistic Models; D008297:Male; D009043:Motor Activity; D012111:Residence Characteristics; D057185:Sedentary Behavior / Q000208:ethnology*