title: Femoral Neck Bone Mineral Density in Persons Over 50 Years Performing Shiftwork: An Epidemiological Study.
abstract: OBJECTIVE
  Shiftwork has been associated with bone loss due to hormonal fluctuations. Our aim was to assess the femoral neck bone mineral density and content in persons over 50 years performing shiftwork.
  
  
  METHODS
  We performed analysis on the femoral neck bone mineral parameters in persons over age 50 years from the National Health and Nutrition Examination Survey cross-sectional data for 2010 to 2011 in regular and shiftworkers. We also assessed the degree of moderate physical activity and smoking in both groups.
  
  
  RESULTS
  Middle-aged men performing shiftwork had significantly higher total femur bone mineral content (37.33 ± 11.00 vs 34.09 ± 10.45, P = 0.01) and femoral neck bone mineral content (4.57 ± 1.07 vs 4.29 ± 1.0, P = 0.03). This difference was not seen in middle aged women.
  
  
  CONCLUSIONS
  Shiftwork does not seem to affect bone mineral density in those performing moderate physical activity.
authors.affiliation: Department of Internal Medicine, Marshall University School of Medicine, Huntington, West Virginia.
authors.forename: Prasanna
authors.initials: P
authors.lastname: Santhanam
authors.forename: Rodhan
authors.initials: R
authors.lastname: Khthir
authors.forename: Larry
authors.initials: L
authors.lastname: Dial
authors.forename: Henry K
authors.initials: HK
authors.lastname: Driscoll
authors.forename: Todd W
authors.initials: TW
authors.lastname: Gress
mesh_terms: D000367:Age Factors; D000368:Aged; D015519:Bone Density; D003430:Cross-Sectional Studies; D005260:Female; D005272:Femur Neck / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys; D005082:Physical Exertion / Q000502:physiology*; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology; D014481:United States / Q000453:epidemiology; D014940:Work Schedule Tolerance / Q000502:physiology*