title: Reproducibility of the jumping mechanography as a test of mechanical power output in physically competent adult and elderly subjects.
abstract: OBJECTIVE
  To compare the reproducibility of the newly developed jumping mechanography with other physical tests.
  
  
  METHODS
  Study 1: Repeated testing with an interval of 2 weeks to assess the short-term repetition error. Study 2: Testing on 5 successive days to assess learning effects.
  
  
  METHODS
  Geriatric clinic, Esslingen, Germany.
  
  
  METHODS
  Study 1 had 36 subjects aged 24 to 88; Study 2 had 22 subjects aged 19 to 86. Locomotor competence in all subjects was assessed using the ability to walk unaided and to perform a tandem stand and tandem walk.
  
  
  METHODS
  The test battery consisted of timed up and go, freely chosen gait speed, maximum gait speed, chair-rising test, and maximum power in jumping mechanography.
  
  
  RESULTS
  All subjects performed the jumping mechanography without major problems. Study 1: Of all tests, maximum power in jumping mechanography depicted the smallest intrasubject short-term error (3.6%), the largest intersubject coefficient of variation (45.4%), and the greatest test-retest correlation coefficient (r=0.99). Study 2: The only tests for which the learning effects were confined to the 1% range were the maximum gait speed test and the maximum power in jumping mechanography.
  
  
  CONCLUSIONS
  Assessment of maximum power in jumping mechanography appears to have good test-retest reliability with negligible learning effects. Moreover, it results in a comparatively large intersubject variability, which makes it an interesting method in the assessment of aging effects in middle-aged to older subjects and patients.
authors.affiliation: Institut für Physiologie, FU Berlin, Germany. j.rittweger@mmu.ac.uk
authors.forename: Jörn
authors.initials: J
authors.lastname: Rittweger
authors.forename: Hans
authors.initials: H
authors.lastname: Schiessl
authors.forename: Dieter
authors.initials: D
authors.lastname: Felsenberg
authors.forename: Martin
authors.initials: M
authors.lastname: Runge
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D015577:Geriatric Assessment; D006801:Humans; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D015203:Reproducibility of Results