title: Quantifying physical activity in physical education via pedometry: a further analysis of steps/min guidelines.
abstract: BACKGROUND
  The validity of common pedometer steps/min guidelines for 1st-12th grade physical education physical activity (PA) recommendations (ie, 33% and 50% PA) was investigated.
  
  
  METHODS
  Data sets from previous research, where physical education PA was quantified via pedometry, were combined. Participants (1st-12th grade, N = 1152) with concurrent steps/min and observed %PA scores were included. Data were analyzed using correlation, regression, and receiver-operator-characteristic (ROC) statistics. Alpha was set at .05.
  
  
  RESULTS
  Overall, by gender and school level group (ie, 1st-6th, 7th-12th) PA outcome measures were strongly correlated and significant (r = .85-.92). Steps/min₂, lesson time₃, stature₄, and BMI₅ were significant predictors (r₁₂.₃₄₅=.91) of %PA₁. Steps/min accounted for 85.4% of the variance for %PA; however, the other predictors only accounted for an additional 0.5%. ROC analyses indicated that steps/min was an excellent discriminator (AUC ≥ .90) of %PA guideline achievement. Steps/min values of 60.6 and 82.2 were the most accurate cut points overall for the 33% and 50% PA guidelines, respectively. Steps/min cut points for gender and school level demonstrated agreement with the overall steps/min cut points.
  
  
  CONCLUSIONS
  These findings support the contention that common steps/min guidelines can be applied in the surveillance of physical education PA.
authors.affiliation: Dept of Movement Sciences, University of Idaho, Moscow, ID, USA.
authors.forename: Philip W
authors.initials: PW
authors.lastname: Scruggs
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002648:Child; D015444:Exercise / Q000502:physiology*; D005260:Female; D017408:Guidelines as Topic; D006801:Humans; D008297:Male; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000592:standards; D010806:Physical Education and Training; D012372:ROC Curve; D012737:Sex Factors