title: Distinct associations of different sedentary behaviors with health-related attributes among older adults.
abstract: OBJECTIVE
  Leisure-time sedentary behaviors (LTSBs) have been associated adversely with health outcomes. However, limited research has focused on different categories of LTSB. We aimed at identifying categories of LTSBs and examining their separate associations with indices of health among Japanese older adults.
  
  
  METHODS
  A postal survey collected data on self-reported health, psychological distress, body mass index, moderate-to-vigorous physical activity (MVPA), LTSBs (five behaviors) and socio-demographic characteristics from 1,580 Japanese older adults (67% response rate; 65-74 years) in 2010. Exploratory factor analysis was used to classify LTSBs. Odds ratios (ORs) were calculated for associations of LTSB categories with self-reported health, psychological distress, overweight, and lower MVPA. Data were analyzed in 2013.
  
  
  RESULTS
  Two categories of LTSB: passive sedentary time (consisting of TV time, listening or talking while sitting, and sitting around) and mentally-active sedentary time (consisting of computer-use and reading books or newspapers) were identified. Higher passive sedentary time was associated with a higher odds of being overweight (OR: 1.39, [95% CI: 1.08-1.80]), and lower MVPA (1.26, [1.02-1.54]). Higher mentally-active sedentary time was associated with lower odds of lower MVPA (0.70, [0.57-0.86]).
  
  
  CONCLUSIONS
  Two types of sedentary time-passive and mentally-active-may play different roles in older adults' well-being.
authors.affiliation: Department of Preventive Medicine and Public Health, Tokyo Medical University, 6-1-1 Shinjuku Shinjuku-ku Tokyo 160-8402, Japan. Electronic address: kikuchih@tokyo-med.ac.jp.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kikuchi
authors.affiliation: Department of Preventive Medicine and Public Health, Tokyo Medical University, 6-1-1 Shinjuku Shinjuku-ku Tokyo 160-8402, Japan. Electronic address: inoue@tokyo-med.ac.jp.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Inoue
authors.affiliation: Sansom Institute for Health Research & School of Population Health, University of South Australia, North Terrace, Adelaide SA 5000, Australia. Electronic address: takemi.sugiyama@unisa.edu.au.
authors.forename: Takemi
authors.initials: T
authors.lastname: Sugiyama
authors.affiliation: Behavioural Epidemiology Laboratory, Baker IDI Heart and Diabetes Institute, Level 4, 99 Commercial Rd, Melbourne, Victoria, 3004, Australia; School of Population Health, The University of Queensland, Level 2, Public Health Building,School of Population Health, University of Queensland, Herston Road Herston QLD, Brisbane, 4006, Australia; Melbourne School of Population Health, the University of Melbourne, Level 5, 207 Bouverie Street, The University of Melbourne, Victoria 3010, Australia; School of Medicine, Monash University, Faculty of Medicine, Nursing and Health Sciences, Monash University, Victoria 3800, Australia. Electronic address: neville.owen@bakeridi.edu.au.
authors.forename: Neville
authors.initials: N
authors.lastname: Owen
authors.affiliation: Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, 359-1192, Japan. Electronic address: koka@waseda.jp.
authors.forename: Koichiro
authors.initials: K
authors.lastname: Oka
authors.affiliation: Department of Geography and Institute of Disaster Mitigation of Urban Cultural Heritage, Ritsumeikan University, 58 Komatsubara Kitamachi, Kita-ku, Kyoto, Kyoto 603-8341, Japan. Electronic address: nakaya@lt.ritsumei.ac.jp.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Nakaya
authors.affiliation: Department of Preventive Medicine and Public Health, Tokyo Medical University, 6-1-1 Shinjuku Shinjuku-ku Tokyo 160-8402, Japan; Japan Health Promotion and Fitness Foundation, 2-6-10 Dai-Tokyo-Building7F, Highashi-Shinbashi, Minato-ku, Tokyo, 105-0021, Japan. Electronic address: tshimo@tokyo-med.ac.jp.
authors.forename: Teruichi
authors.initials: T
authors.lastname: Shimomitsu
mesh_terms: D000368:Aged; D044466:Asian People; D015992:Body Mass Index; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology; D005163:Factor Analysis, Statistical; D005260:Female; D006304:Health Status; D006801:Humans; D007564:Japan; D007899:Leisure Activities; D008297:Male; D050177:Overweight / Q000209:etiology; D057185:Sedentary Behavior; D057566:Self Report; D011795:Surveys and Questionnaires
keywords: Aged; Body mass index; Motor activity in physical activity