Intrasession and Intersession Reliability of Hand-held Dynamometer Measurements Taken on Brain-damaged Patients

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Abstract
Recent reports have characterized force measurements obtained with hand-held dynamometers from brain-damaged patients as being highly reliable. The purposes of this two-part study were to replicate essential parts of those studies and to further examine the reliability of these measurements in a clinical context. Repeated force measurements were taken from the nonparetic and paretic limbs of brain-damaged patients during the same testing session (Part 1) and during two testing sessions separated by two days (Part 2). The intratester intraclass correlation coefficients (ICCs) for all measurements taken during a single session ranged from .88 to .98. The ICCs for repeated measurements taken two days apart from the paretic limbs ranged from .90 to .98. The ICCs for repeated measurements taken two days apart from the nonparetic limbs ranged from .31 to .93. The ICCs for repeated measurements taken two days apart from the combined data for all limbs ranged from .79 to .97. Hand-held dynamometer measurements taken on brain-damaged patients appear to be highly reliable when taken during the same testing session. When repeated measurements are separated by a longer time interval, the measurements taken from the paretic limbs continue to be highly reliable, whereas most measurements taken on the nonparetic limbs exhibit poor reliability.

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