title: Association between serum 25-hydroxyvitamin d levels, bone geometry, and bone mineral density in healthy older adults.
abstract: OBJECTIVE
  The association between serum 25-hydroxyvitamin D values and cortical/trabecular bone parameters in older adults has been incompletely explored. This study was designed to investigate the relationship between serum 25-hydroxyvitamin D levels and bone parameters for the tibia and radius using peripheral quantitative computed tomography in free-living healthy older adults.
  
  
  METHODS
  The study involved 134 older adults attending a twice-weekly low-intensity fitness program. In addition to clinical history and serum parameters, we assessed fat-free mass using dual-energy X-ray absorptiometry, total bone and cortical bone cross-sectional areas, and trabecular and cortical bone mineral density for the tibia and radius by peripheral quantitative computed tomography.
  
  
  RESULTS
  After applying multivariate linear regression models, adjusting for sex, age, body mass index, fat mass and fat-free mass, and creatinine, the association between 25-hydroxyvitamin D and bone parameters was significant for total bone and cortical bone cross-sectional areas in the radius (partial R (2) = 0.05 and 0.09, respectively) and for trabecular bone mineral density and cortical bone cross-sectional area in the tibia (partial R (2) = 0.11 and 0.02, respectively).
  
  
  CONCLUSIONS
  These findings support the idea that serum 25-hydroxyvitamin D levels and bone parameters are linked in older adults. Longitudinal studies are needed to establish whether vitamin D levels over time are associated with changes in these parameters.
authors: Department of Medicine, DIMED, Geriatrics Section, University of Padova, Italy.
authors: Marco
authors: M
authors: Mosele
authors: Alessandra
authors: A
authors: Coin
authors: Enzo
authors: E
authors: Manzato
authors: Silvia
authors: S
authors: Sarti
authors: Linda
authors: L
authors: Berton
authors: Francesco
authors: F
authors: Bolzetta
authors: Alessandra
authors: A
authors: Imoscopi
authors: Giulia
authors: G
authors: Rinaldi
authors: Egle
authors: E
authors: Perissinotto
authors: Giuseppe
authors: G
authors: Sergi
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D000375:Aging / Q000378:metabolism* / Q000473:pathology*; D015519:Bone Density; D001842:Bone and Bones / Q000000981:diagnostic imaging* / Q000378:metabolism*; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D015999:Multivariate Analysis; D011884:Radius / Q000000981:diagnostic imaging / Q000378:metabolism; D013977:Tibia / Q000000981:diagnostic imaging / Q000378:metabolism; D014057:Tomography, X-Ray Computed; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D
keywords: 25-OHD; Bone density; Cortical bone area; Older adults; pQCT