title: Assessment of fatigability of older women during sit-to-stand performance.
abstract: BACKGROUND
  Fatigability of older adults is relevant with regard to physical performance, falls and physical activity. Objective and inexpensive assessment tools for testing fatigability in the persons' home environment are not available.
  
  
  OBJECTIVE
  The aim of this study was to develop a protocol to objectively measure fatigability during repeated sit-to-stand performance in older persons.
  
  
  METHODS
  Decrease of maximum velocity of performance during repeated sit-to-stand transfers and the number of repetition when achieving a 10, 15, and 20 % fatigue threshold were measured in 49 community-dwelling older women using a linear encoder.
  
  
  RESULTS
  Mean maximum velocity of the sit-to-stand performance was 1.12 m/s (SD 0.17 m/s) with an estimated change of velocity per repetition of -0.0037 m/s (95 % CI -0.0039 to -0.0035) during the test. The mean number of repetitions representing 10, 15, and 20 % fatigue threshold was 8.1, 13.8, and 21, respectively.
  
  
  CONCLUSIONS
  This simple test protocol provides objective information about the decrease of performance of a daily task in older adults.
  
  
  CONCLUSIONS
  Fatigability of the sit-to-stand performance can be measured objectively by measuring the decrease of maximum velocity of consecutive repetitions and the repetition number achieving a 20 % fatigue threshold.
authors.affiliation: Department of Geriatrics, Clinic for Geriatric Rehabilitation, Robert-Bosch-Hospital, Auerbachstr. 110, 70376, Stuttgart, Germany. ulrich.lindemann@rbk.de.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Lindemann
authors.affiliation: Department of Geriatrics, Clinic for Geriatric Rehabilitation, Robert-Bosch-Hospital, Auerbachstr. 110, 70376, Stuttgart, Germany.|Institute of Epidemiology and Medical Biometry, Ulm University, Helmholtzstr. 18-22, 89081, Ulm, Germany.
authors.forename: Jochen
authors.initials: J
authors.lastname: Klenk
authors.affiliation: Department of Geriatrics, Clinic for Geriatric Rehabilitation, Robert-Bosch-Hospital, Auerbachstr. 110, 70376, Stuttgart, Germany.
authors.forename: Clemens
authors.initials: C
authors.lastname: Becker
mesh_terms: D000058:Accidental Falls; D000368:Aged; D000369:Aged, 80 and over; D015444:Exercise / Q000502:physiology*; D005221:Fatigue / Q000175:diagnosis*; D005260:Female; D006801:Humans
keywords: Fatigability; Linear encoder; Older persons; Sit-to-stand performance