title: The reliability of selected measures of muscular performance in knee flexion and extension using the hydra-fitness omni tron total power unit: a pilot study.
abstract: This research was supported in part by an equipment grant from Hydra-Fitness Industries. Inc., Belton, TX. Thirty-one subjects were included in this investigation (19 female and 12 male). The subjects ranged in age from 19-38 years with a mean age of 25 years. The subjects performed a maximal strength test of knee flexion and extension using the Omni Tron Total Power Unit employing one resistance setting. Values were obtained for eight muscular performance indicators. An identical strength test was repeated the following day. Reliability coefficients were calculated using the two sets of data. Pearson product coefficients for the eight performance indicators ranged from 0.85 to 0.97. Values from test 1 were also compared to test 2 values for significant difference using the student t-test. No significant difference was found (p < 0.05). The authors concluded that, based on the data obtained in this pilot study, the Omni Tron Total Power Unit holds the potential to produce reliable data relating to muscular performance. J Orthop Sports Phys Ther 1989;10(10):418-422.
authors.forename: J S
authors.initials: JS
authors.lastname: Guffey
authors.forename: D R
authors.initials: DR
authors.lastname: Guffey