Altered Cervical Spine Position Results in Decreased Eccentric Shoulder Rotation Strength

Int J Sports Med DOI: 10.1055/a-2281-1396Overhead athletes require strenuous shoulder activity in nonneutral cervical spine positions to eccentrically decelerate the throwing/striking arm following ball release/contact. We therefore aimed to compare eccentric shoulder rotation strength through a 90° arc between neutral and rotated positions. Fifty-two participants (19 M, 34 F 170±10 cm; 73±18 kg, 21.9±2.9 years) without shoulder or cervical spine pathology participated. Isokinetic eccentric shoulder rotation strength was measured through a 90° arc with the shoulder elevated 90° in frontal plane (frontal plane), and 45° anterior to the frontal plane (scapular plane) in neutral and rotated cervical spine positions. Cervical spine position was obtained by instructing participants to maximally rotate their respective side. Frontal plane eccentric external rotated strength differed between neutral and contralaterally positions in the first 10° of the motion, near forearm vertical (p+=+0.029). Internal rotation strength differed between neutral and contralaterally rotated positions from 55–60° external rotation (p+=+0.004). Scapular plane eccentric external rotation differed between cervical positions between 21–67° shoulder external rotation (p<0.001). Scapular plane internal rotation strength diffe...
Source: International Journal of Sports Medicine - Category: Sports Medicine Authors: Tags: Orthopedics & Biomechanics Source Type: research