Strength profiles of the shoulder

Strength profiles of the shoulder joint for three arm positions are measured experimentally to present quantitative data on the shoulder strength. The experimental profiles are compared with the corresponding theoretical profiles which are obtained by using a shoulder model. The calculations were made both with default muscle parameters and individually adapted parameters. The results show that the employed shoulder model gives reliable predictions and effects of training is demonstrated. Generally higher forces are predicted for adduction than for abduction. Appropriate adjustments of muscle parameters result in a better individual fit of the theoretical profile making it possible to use strength profile measurements diagnostically.