Presenter Amanda Gomes de Assis Couto, PT, MSc - Ribeirão Preto Medical School, University of São Paulo (Department of Biomechanics, Medicine and Rehabilitation of Locomotor) - BR
Anamaria Siriani de Oliveira, PT, PhD - Ribeirão Preto Medical School, University of São Paulo (Department of Biomechanics, Medicine and Rehabilitation of Locomotor) - BR
Background: Glenohumeral internal rotation deficit (GIRD) is the most frequent biomechanical change in overhead athletes. Several studies have been associated GIRD with the clinical
assessment of shoulder in baseball athletes. However, there are no studies, which explain if GIRD is related to the range of motion (ROM), strength evaluation and functional testing in competitive
water polo athletes of high school. Therefore, the purpose of this research is to study the factors associated with glenohumeral internal rotation deficit and its correlation with functional
assessment of shoulder in competitive water polo athletes of high school.
Methods: Thirty-five high school water polo players of both sexes with an average age of 15 (± 1.6) years old have participated in the study. All participants and their guardians have
read and signed a statement of consent and assent (for athletes under 18 years old) before proceeding the study. The Review Board of the University has approved the study protocol. All evaluations
have been performed before the athletes’ training sessions and at least 12 hours after the last training session. The assessment of the glenohumeral internal rotation deficit has been accomplished
through the ROM measure of glenohumeral rotations with a goniometer. The functional assessment has been consisted of pectoralis minor length index measurement, torque assessment of internal rotators
with isokinetic dynamometer, Close Kinetic Chain Upper Extremity Stability (CKCUES) functional testing, and the Shoulder Pain and Disability Index (SPADI - Br) and Athletic Shoulder Outcome Rating
Scale (ASORS) questionnaires. The assessment sequence has been drawn at random among the goniometric measurements, CKCUES, pectoralis minor length index measurement and the assessment of self-reported
shoulder function. The assessment in isokinetic dynamometer has been scheduled in a different day from the first assessment day, so that the accumulated fatigue due to the set of torque tests could
not interfere in the functional assessment. In statistical analysis of data, multiple linear regression has been used to identify factors associated with the glenohumeral internal rotation deficit.
Bilateral Pearson correlation analysis has been used to verify the relationship between the results of internal rotation measures and functional assessment of shoulder.
Results: Significant association between internal rotation ROM of dominant member and the total arc of glenohumeral rotational motion has been found in multiple linear regression
analysis (R ² = 0.77; p = 0.001). The pectoralis minor length index and the peak of torque of internal rotators have not been associated significantly with internal rotation ROM. The functional
assessment has not significantly correlated with internal rotation ROM.
Conclusions: The only factor that has associated with internal rotation ROM was the total rotation motion of glenohumeral. Internal rotation ROM has not correlated with the functional
assessment of shoulder in conpetitive water polo players of high school.