Affiliations: [a] Physical Education School, Federal University of Rio
Grande do Sul, Brazil | [b] College of Physical Education and Exercise Science,
University of Brasília, Brazil | [c] Department of Kinesiology, California State University
Fullerton, Fullerton, CA, USA
Abstract: The purpose of this study was to compare the effect of two different
positions of shoulder internal rotation (IR) and external rotation (ER) on
isokinetic concentric and eccentric peak torque as well as conventional and
dynamic ratios. Nineteen athletes (Eigth judo and eleven tennis players), (20.3
± 5.2 yrs) performed 5 maximal unilateral isokinetic
concentric shoulder IR and ER repetitions at 60°/s
and 120°/s. The subjects also performed 3 and 5
maximal eccentric shoulder ER repetitions at 60°/s
and 120°/s respectively. The tests were performed in
two seated positions: 1) with the shoulder abducted in the scapular plane, and
2) with the shoulder flexed in the saggital plane. Shoulder dynamic control
ratio (DCR) and conventional ratio were also assessed. The scapular plane
position showed significantly (p < 0.05) greater peak torque
(PT) values than the saggital plane position during concentric IR at both
speeds. However, the saggital plane position PT values were significantly
greater during concentric and eccentric ER in both speeds. Additionally, the
DCR and the conventional ratio values were significantly greater for the
saggital plane shoulder position. These results suggest that test position is
an important control variable in isokinetic shoulder IR and ER testing.
