Predictive Models of Upper Extremity Rotary and Linear Pull Strength

Abstract

Regression models were developed to predict linear isokinetic pull strength of the upper extremity from rotary isokinetic strengths about the elbow and shoulder and other related factors. Data on linear pull strength were gathered and analyzed to determine levels of factors appropriate for measuring isolated joint rotary strengths—elbow flexion and shoulder extension. Data on these rotary strengths were then gathered and used to develop predictive models for peak elbow flexion and peak shoulder extension forces. Using these models and the pull-strength data, other models were finally developed for predicting peak linear pull force. The data from seven subjects were used to develop the models, which were validated by data from three other subjects. All contractions were maximal voluntary ones, and only peak torques were analyzed. Subjects were always seated during strength testing.

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