title: Association of unipedal standing time and bone mineral density in community-dwelling Japanese women.
abstract: Bone mineral density (BMD) and physical performance of the lower extremities decrease with age. In community-dwelling Japanese women, unipedal standing time, timed up and go test, and age are associated with BMD while in women aged 70 years and over, unipedal standing time is associated with BMD.
  
  
  BACKGROUND
  The aim of this study was to clarify whether unipedal standing time is significantly associated with BMD in community-dwelling women.
  
  
  METHODS
  The subjects were 90 community-dwelling Japanese women aged 54.7 years. BMD of the second metacarpal bone was measured by computed X-ray densitometry. We measured unipedal standing time as well as timed up and go test to assess physical performance of the lower extremities.
  
  
  RESULTS
  Unipedal standing time decreased with increased age. Timed up and go test significantly correlated with age. Low BMD was significantly associated with old age, short unipedal standing time, and long timed up and go test. Stepwise regression analysis revealed that age, unipedal standing time, and timed up and go test were significant factors associated with BMD. In 21 participants aged 70 years and over, body weight and unipedal standing time, but not age, were significantly associated with BMD.
  
  
  CONCLUSIONS
  BMD and physical performance of the lower extremities decrease with older age. Unipedal standing time, timed up and go test, and age are associated with BMD in community-dwelling Japanese women. In women aged 70 years and over, unipedal standing time is significantly associated with BMD.
authors.affiliation: Department of Orthopaedic Surgery, School of Medicine, University of Occupational and Environmental Health, Yahatanishi-ku, Kitakyushu, Japan. a-sakai@med.uoeh-u.ac.jp
authors.forename: A
authors.initials: A
authors.lastname: Sakai
authors.forename: N
authors.initials: N
authors.lastname: Toba
authors.forename: M
authors.initials: M
authors.lastname: Takeda
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Abe
authors.forename: K
authors.initials: K
authors.lastname: Aoyagi
authors.forename: T
authors.initials: T
authors.lastname: Nakamura