title: Effect of calcium and vitamin D supplementation on bone mineral density in children with inflammatory bowel disease.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the effect of calcium and vitamin D2 supplementation on bone mineral density (BMD) in children with inflammatory bowel disease (IBD).
  
  
  METHODS
  This was an open-label, prospective study conducted over a 12-month period. Seventy-two patients were divided into 2 groups based on lumbar spine areal BMD (L2-4 aBMD). Patients with an L2-4 aBMD z score of -1 or higher were assigned to the control group (n = 33; mean age, 11.0 +/- 3.5 years; 20 boys). Patients with an L2-4 aBMD of less than -1 (n = 39; mean age 11.8 +/- 2.5 years; 25 boys) were allocated to the intervention group and received 1000 mg of supplemental elemental calcium daily for 12 months (n = 19) or supplemental calcium for 12 months and 50,000 IU of vitamin D2 monthly for 6 months (n = 20).
  
  
  RESULTS
  The 2 groups differed in L2-4 aBMD z scores (intervention, -1.9 +/- 0.6; control, -0.2 +/- 0.6; P < 0.001) and volumetric L2-4 BMD (vBMD; intervention, 0.29 +/- 0.04; control, 0.33 +/- 0.06; P < 0.001). After 1 year of therapy, the control and intervention groups had similar changes in height z scores, L2-4 aBMD, L2-4 vBMD (z score change, L2-4 aBMD: control 0.2 +/- 0.6 [n = 21], intervention 0.4 +/- 0.6; P = 0.4 [n = 26]; z score change, L2-4 vBMD: control 0.1 +/- 0.4, intervention 0.2 +/- 0.6; P = 0.74). The changes in these parameters were similar between patients who had received calcium only or calcium plus vitamin D.
  
  
  CONCLUSIONS
  These results suggest that, in children with IBD, supplementation of calcium and vitamin D does not accelerate accrual in L2-4 BMD.
authors.affiliation: Department of Pediatrics, Children's Hospital of Eastern Ontario, University of Ottawa, Ottawa, ON, Canada.
authors.forename: Eric I
authors.initials: EI
authors.lastname: Benchimol
authors.forename: Leanne M
authors.initials: LM
authors.lastname: Ward
authors.forename: J C
authors.initials: JC
authors.lastname: Gallagher
authors.forename: Frank
authors.initials: F
authors.lastname: Rauch
authors.forename: Nick
authors.initials: N
authors.lastname: Barrowman
authors.forename: Jaime
authors.initials: J
authors.lastname: Warren
authors.forename: Susan
authors.initials: S
authors.lastname: Beedle
authors.forename: David R
authors.initials: DR
authors.lastname: Mack
mesh_terms: D015502:Absorptiometry, Photon; D015519:Bone Density / Q000187:drug effects*; D050071:Bone Density Conservation Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D002118:Calcium / Q000008:administration & dosage / Q000627:therapeutic use*; D002648:Child; D015331:Cohort Studies; D019587:Dietary Supplements; D004359:Drug Therapy, Combination; D004872:Ergocalciferols / Q000008:administration & dosage / Q000627:therapeutic use*; D005260:Female; D005500:Follow-Up Studies; D050815:Fractures, Compression / Q000209:etiology / Q000517:prevention & control; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000150:complications*; D008297:Male; D011446:Prospective Studies; D016103:Spinal Fractures / Q000517:prevention & control; D016896:Treatment Outcome
chemical_list: D050071:Bone Density Conservation Agents; D004872:Ergocalciferols; D002118:Calcium