title: Effect of instructions on isokinetic trunk strength testing variability, reliability, absolute value, and predictive validity.
abstract: Although isokinetic strength testing has been in use for more than two decades, and numerous studies have addressed isokinetic performance of the lumbar spine, the effect of instructions on isokinetic trunk strength has not been studied. In a sample of 30 healthy women, this study examined the effect of "high-demand" instructions on lumbar strength performance. High-demand instructions were found to have a substantial positive effect on performance variability, reliability, absolute magnitude, and validity. Under these conditions, isokinetic trunk strength was found to be predictive of performance in a frequent lifting-lowering task.
authors.affiliation: Employment and Rehabilitation Institute of California, Santa Ana.
authors.forename: L
authors.initials: L
authors.lastname: Matheson
authors.forename: V
authors.initials: V
authors.lastname: Mooney
authors.forename: V
authors.initials: V
authors.lastname: Caiozzo
authors.forename: G
authors.initials: G
authors.lastname: Jarvis
authors.forename: J
authors.initials: J
authors.lastname: Pottinger
authors.forename: C
authors.initials: C
authors.lastname: DeBerry
authors.forename: K
authors.initials: K
authors.lastname: Backlund
authors.forename: K
authors.initials: K
authors.lastname: Klein
authors.forename: J
authors.initials: J
authors.lastname: Antoni
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008161:Lumbosacral Region / Q000502:physiology*; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D016474:Weight-Bearing / Q000502:physiology*