title: Steps per day required for meeting physical activity guidelines in Japanese adults.
abstract: BACKGROUND
  This study aimed to determine the optimal number of steps per day needed to meet the current physical activity guidelines in a large population sample of Japanese adults.
  
  
  METHODS
  An accelerometer-based activity monitor (Kenz Lifecorder) was used to simultaneously measure moderate-to-vigorous intensity physical activity (MVPA) and step counts in 940 Japanese adults (480 women) aged 20 to 69 years. The step count per day equivalents to 2 different physical activity recommendations (23 MET-h/wk and 150 min/wk of MVPA) were derived using linear regression analysis and receiver operating characteristic (ROC) methodology.
  
  
  RESULTS
  Linear regression analysis showed that daily step counts correlated with weekly PAEE (r = .83) and daily minutes of MVPA (r = .83). Linear regression analysis also showed that 23 MET-h/wk of MVPA is equivalent to 11,160 steps/d, and 150 min/wk of MVPA is equivalent to 7716 steps/d. ROC analysis yielded similar findings: 10,225 steps/d are required to accumulate ≥ 23 MET-h/wk of MVPA and 7857 steps/d are needed to meet the recommendation of ≥ 150 min/wk of MVPA.
  
  
  CONCLUSIONS
  The findings suggest that 10,000 to 11,000 and 7700 to 8000 steps/d represent the optimal thresholds for accumulating ≥ 23 MET-h/wk of MVPA and ≥ 150 min/wk of MVPA, respectively, for Japanese adults.
authors.affiliation: School of Kinesiology, Shanghai University of Sport, Shanghai, China.
authors.forename: Zhen-Bo
authors.initials: ZB
authors.lastname: Cao
authors.forename: Taewoong
authors.initials: T
authors.lastname: Oh
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Miyatake
authors.forename: Kazuyo
authors.initials: K
authors.lastname: Tsushita
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Higuchi
authors.forename: Izumi
authors.initials: I
authors.lastname: Tabata
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005260:Female; D017408:Guidelines as Topic; D006801:Humans; D007564:Japan; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*; D064797:Physical Conditioning, Human / Q000592:standards*; D012372:ROC Curve; D016138:Walking / Q000502:physiology*; D055815:Young Adult