title: Measurement of low back mobility, isometric strength and isoinertial performance with isostation B-200 triaxial dynamometer: reproducibility of measurement and development of functional indices.
abstract: The reproducibility of measurements with the triaxial lumbar dynamometer Isostation B-200 was measured in 61 volunteers with or without low back problems. Both for the intra- and interrater measurements the reproducibility was good (r = 0.76-0.89) for lateral flexions and almost as good (r = 0.76-0.87) for the sum of all ranges of motion (SROM). The corresponding reproducibilities were excellent (r = 0.82-0.99) for the isometric strength and good (r = 0.60-0.90) for isoinertial flexion-extension repetition test parameters in the main (primary axis) direction. A number of parameters were combined into three functional indices: the reproducibility for "power" and "work" index was good (r = 0.76-0.94) in both intra- and interrater conditions, whereas for "movement" index it was somewhat weaker (r = 0.53-0.87). It is concluded that parameters: lateral flexions, SROM, isometric strength, and functional indices (power and work) are reproducible enough to use in further studies.
authors.affiliation: Rehabilitation Research Centre, Social Insurance Institution, Turku, Finland.
authors.forename: U
authors.initials: U
authors.lastname: Rytökoski
authors.forename: S L
authors.initials: SL
authors.lastname: Karppi
authors.forename: P
authors.initials: P
authors.lastname: Puukka
authors.forename: J
authors.initials: J
authors.lastname: Soini
authors.forename: T
authors.initials: T
authors.lastname: Rönnemaa
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena; D001703:Biophysics / Q000295:instrumentation*; D005260:Female; D006801:Humans; D007537:Isometric Contraction; D017116:Low Back Pain / Q000503:physiopathology; D008161:Lumbosacral Region / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009068:Movement; D015588:Observer Variation; D015203:Reproducibility of Results; D012984:Software