Ratings of acceptable load and maximal isometric lifting strengths: the effects of repetition

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Abstract
The effects of repetition on psychophysically acceptable loads and maximal isometric lifting strengths were studied in 2 groups of subjects. In both groups, subjects selected acceptable loads for dynamic lifting between table and floor and were tested for maximal and acceptable lifting strength isometrically at knee and waist levels. In series I, 33 subjects (15 males, 18 females) were tested 4 times with a minimal interval of 5 days between tests. In series II, 12 subjects (8 males, 4 females) were tested daily from Monday to Friday on 2 consecutive wk. Differences in acceptable isometric lifting strength between the 2 groups appeared to arise from minor differences in the instructions given; but in neither series was there a significant change in acceptable lifting strength, either dynamic or isometric. In series I, no change was noted in maximal isometric lifting strength. But in series II there was a gain in maximal lifting strength at knee level of 25%. Also in series II, the acceptable isometric lifting strength at waist level was consistently found to be 60% of the acceptable dynamic lifting strength.