title: Threshold of chair stand power necessary to perform activities of daily living independently in community-dwelling older women.
abstract: OBJECTIVE
  To determine (1) the reproducibility of measurements of chair stand mean power (CSMP), (2) the relationships of CSMP with age, height, body mass, and body mass index, and (3) to identify the threshold of CSMP below which performing activities of daily living (ADL) is limited in older women.
  
  
  METHODS
  Eighty-seven older women (70-88 years) were divided into an independent group (n = 48) who needed no assistance and a dependent group (n = 39) who needed assistance to perform ADL. The CSMP expressed in watts (velocity × load) for each repetition was assessed by a device that measures mean velocity.
  
  
  RESULTS
  The intraclass correlation coefficient for CSMP suggested a high level of reproducibility (intra-class correlation coefficient = 0.88-0.92, P < .05). Relationships existed between CSMP and age (r = -0.37; P < .001), CSMP and height (r = 0.31; P < .001), CSMP and body mass (r = 0.43; P < .001), and CSMP and body mass index (r = 0.30; P < .001). A receiver operator characteristic curve analysis revealed the optimal threshold criteria; a CSMP of 214 watts resulted in the highest combination of sensitivity (82.1%) and specificity (81.2%).
  
  
  CONCLUSIONS
  The threshold of CSMP below which assistance is required to perform ADL in community-dwelling older women was identified.
authors.affiliation: 1Lab of Exercise Gerontology, Graduate School of Natural Sciences, Nagoya City University, Nagoya, Japan. 2Department of Rehabilitation, Yonaha General Hospital, Kuwana, Mie, Japan. 3Department of Human Performance Studies, Center for Physical Activity and Aging, Wichita State University, Wichita, Kansas. 4National Institute of Fitness and Sports in Kanoya, Kanoya, Japan.
authors.forename: Yoshiji
authors.initials: Y
authors.lastname: Kato
authors.forename: Mohammod M
authors.initials: MM
authors.lastname: Islam
authors.forename: Kaelin C
authors.initials: KC
authors.lastname: Young
authors.forename: Michael E
authors.initials: ME
authors.lastname: Rogers
authors.forename: Nobuo
authors.initials: N
authors.lastname: Takeshima
mesh_terms: D000203:Activities of Daily Living; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001827:Body Height; D015992:Body Mass Index; D005260:Female; D015577:Geriatric Assessment / Q000379:methods; D006801:Humans; D057187:Independent Living; D009068:Movement; D053580:Muscle Strength; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity