This study examines the hypothesis that forcesol;distance curve variability distinguishes submaximal from maximal efforts in isokinetic trunk and lifting strength tests. Thirty normal subjects were tested on the Cybex Trunk Extensionsol; Flexion (TEF) and Liftask (LT) machines during maximal (100percnt;) and submaximal (50percnt;) efforts. Considering each test separately, visual assessments of curve variability were indeterminate of degree of effort in 28percnt; of TEF and 34percnt; of LT tests. Measurement models of curve variability were more clearly discriminating. When a given subject's test curves were considered together, scaled visual assessments identified the degree of effort in 91percnt; of TEF and 86percnt; of LT results. The measurement models were accurate 90ndash;92percnt; of TEF and 79ndash;92percnt; of LT results. Clinical judgment is required in evaluating effort during tests of isokinetic trunk and lifting strength.
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