Scapular muscle recruitment patterns and isokinetic strength ratios of the shoulder rotator muscles in individuals with and without impingement syndrome.

The aim of this study was to compare the recruitment patterns and latencies of the scapular muscles, as well as the isokinetic performance of the shoulder rotators in 10 subjects with unilateral impingement syndrome who comprised the impingement group (IG) with a control group (CG) of 10 asymptomatic subjects. The recruitment patterns and latencies were evaluated by electromyographic activity during arm elevation in the scapular plane. Isokinetic work ratios of the shoulder rotator muscles were used to analyze muscular performance.