Angle Specific Analysis of Side-to-Side Asymmetry in the Shoulder Rotators

Sports

Cassio V. Ruas²  Ronei S. Pinto²  Eduardo L. Cadore²  Lee E. Brown¹ 

[1] Department of Kinesiology, KHS 233 800 N. State College Blvd., California State University, Fullerton 92831, CA, USA; E-Mail:;Physical Education School, Federal University of Rio Grande do Sul, Brazil, Felizardo Street, 750—Jardim Botânico, Porto Alegre/RS 90690-200, Brazil; E-Mails:

关键词: angle specific torque;    independent peak torque;    strength imbalance;    injury prevention;    performance enhancement;   

DOI  :  10.3390/sports3030236

来源: mdpi

【 摘 要 】

Although side-to-side asymmetry of the shoulder rotators calculated by independent peak torque (IPT) has been used for interpretation of injury risks in athletes, it may not measure strength through the entire range of motion (ROM) tested. The aim of this study was to compare side-to-side asymmetry of the shoulder rotators between independent peak torque (IPT) and ten-degree angle specific torque (AST). Twenty healthy adult males (24.65 ± 2.4 years) performed concentric and eccentric internal rotation (IR) and external rotation (ER) of the preferred and non-preferred arms on an isokinetic dynamometer at 60°/s through 150° of total ROM. The total ROM was divided into 14 ten-degree angles of the physiological ROM from −90° of ER to 60° of IR. Concentric and eccentric IR IPT (10.5% ± 8.7% and 12.1% ± 7.2%) and ER IPT (13.6% ± 9.8% and 8.7% ± 5.6%) were significantly less than AST at several angles (p < 0.05). IPT might lead to erroneous interpretations of side-to-side asymmetry in the shoulder rotators and does not represent the entire ROM tested. This information could be used to prescribe strength exercises to enhance overhead performance and reduce risk of shoulder injuries.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.