title: Development and reproducibility of the bone loading history questionnaire.
abstract: OBJECTIVE
  To develop an historical bone loading questionnaire that assesses loads applied to the skeleton using bone loading units and to determine its reproducibility. Additional purposes were to correlate bone loading units with areal bone mineral density (aBMD) and to determine whether low levels of bone loading increase the odds for low aBMD in healthy premenopausal women.
  
  
  METHODS
  Premenopausal women (N=80; age: 31+/-7.7 yr) completed the newly developed bone loading history questionnaire (BLHQ) twice within 4-6 wk to establish reproducibility. aBMD (g.cm) of the whole body, lumbar spine (L2-4), and right hip (proximal femur) were assessed with dual energy x-ray absorptiometry (DXA) in the women.
  
  
  RESULTS
  The questionnaire demonstrated good test-retest reliability in premenopausal women using intraclass correlation coefficients (spine r=0.89, P<0.001; hip r=0.92, P<0.001). Total spine bone loading exposure (r=0.338; P=0.002) and hip bone loading exposure (r=0.317; P=0.004) were significantly and independently correlated with femoral neck aBMD, after adjusting for BMI. Logistic regression analyses revealed increased odds for low femoral neck aBMD among those in the lowest tertile for recent hip bone loading exposure after adjusting for older ages, oral contraceptive use, low calcium intake, and an overweight BMI (OR=3.62; CI=1.09-11.94; P=0.035).
  
  
  CONCLUSIONS
  Historical bone loading activity can be reliably assessed and is moderately associated with femoral neck aBMD. This questionnaire could help to identify women with low femoral neck aBMD prior to menopause.
authors.affiliation: Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT 84112-0920, USA. Shawn.Dolan@hsc.utah.edu
authors.forename: Shawn H
authors.initials: SH
authors.lastname: Dolan
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Williams
authors.forename: Barbara E
authors.initials: BE
authors.lastname: Ainsworth
authors.forename: Janet M
authors.initials: JM
authors.lastname: Shaw
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001696:Biomechanical Phenomena; D015992:Body Mass Index; D015519:Bone Density / Q000502:physiology; D001842:Bone and Bones / Q000033:anatomy & histology / Q000502:physiology*; D002136:Calcium, Dietary / Q000008:administration & dosage; D003276:Contraceptives, Oral / Q000627:therapeutic use; D005260:Female; D005272:Femur Neck / Q000033:anatomy & histology; D005544:Forecasting; D006801:Humans; D008159:Lumbar Vertebrae / Q000033:anatomy & histology; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D050177:Overweight / Q000502:physiology; D017697:Premenopause / Q000502:physiology; D015203:Reproducibility of Results; D012307:Risk Factors; D011795:Surveys and Questionnaires / Q000592:standards; D016474:Weight-Bearing / Q000502:physiology*; D051598:Whole Body Imaging
chemical_list: D002136:Calcium, Dietary; D003276:Contraceptives, Oral