title: Prediction of bone mineral density and content from measures of physical activity and sedentary behavior in younger and older females.
abstract: BACKGROUND
  Little is known regarding the extent to which physical activity (PA) and sedentary behavior (SB) influence bone mineral content (BMC) and bone mineral density (BMD) in females across the lifespan.
  
  
  METHODS
  Data from 2232 females aged 12 years and older collected as part of the 2007-2008 National Health and Nutrition Examination Survey were analyzed. Categories of PA and SB were used to predict femoral and spinal BMD and BMC in four age groups (G1: 12-17; G2: 18-39; G3: 40-64; G4: ≥ 65 years). Self-reported PA categories included sufficient moderate-to-vigorous recreational PA (S-MVRPA) and insufficient MVRPA (I-MVRPA).
  
  
  RESULTS
  G1 females who accumulated S-MVRPA displayed greater femoral and spinal BMC and BMD compared to G1 females who displayed I-MVRPA. For G4 females, higher levels of SB were associated with lower femoral BMC and BMD.
  
  
  CONCLUSIONS
  These findings highlight the importance of engaging in sufficient moderate-to-vigorous physical activity during adolescence and reducing sedentary behavior in older adults to improve bone health in females.
authors: Department of Health and Human Performance, Middle Tennessee State University, 1301 E. Main St., Murfreesboro, TN 37132, USA.
authors: Saori I
authors: SI
authors: Braun
authors: Department of Health and Human Performance, Middle Tennessee State University, 1301 E. Main St., Murfreesboro, TN 37132, USA.
authors: Youngdeok
authors: Y
authors: Kim
authors: Department of Biology, Middle Tennessee State University, 1301 E. Main St., Murfreesboro, TN 37132, USA.
authors: Amy E
authors: AE
authors: Jetton
authors: Department of Health and Human Performance, Middle Tennessee State University, 1301 E. Main St., Murfreesboro, TN 37132, USA.
authors: Minsoo
authors: M
authors: Kang
authors: Department of Health and Human Performance, Middle Tennessee State University, 1301 E. Main St., Murfreesboro, TN 37132, USA.
authors: Don W
authors: DW
authors: Morgan
keywords: BMC, bone mineral content; BMD, bone mineral density; Bone mineral content; Bone mineral density; Females' health behavior sedentary lifestyle; I-MVRPA, insufficient moderate-to-vigorous recreational physical activity; S-MVRPA, sufficient moderate-to-vigorous recreational physical activity; SB, sedentary behavior; VMHDS, vitamins minerals, herbals, or other dietary supplements