Application of Eccentric Antagonist/Concentric Agonist Strength Ratios in Evaluating Balance between Rotator of Shoulder Joint

Eccentric antagonist/concentric agonist strength ratios is widely used in evaluating balance between eccentric strength of antagonist and concentric strength of agonist during shoulder joint movement in the overhead athlete,and frequently found in the sport medical literatures recently abroad.By the method of literature review,this paper reviewed the method of isokinetic testing,interpretation,significance,computation and application of the eccentric antagonist/concentric agonist strength ratios.The study found that the ratios between eccentric antagonist peak torque and concentric agonist peak torque of isokinetic shoulder rotation(external or internal rotation)test was used for diagnosing the equilibrium between eccentric antagonist muscle strength and concentric agonist muscle strength,reflecting the different physiological contraction form between antagonist and agonist objectively than the ratios between external rotators and internal rotation muscles concentric peak torque.Although foreign researchers generally believed that eccentric antagonist/concentric agonist strength ratios should be greater than 1when made isokinetic shoulder rotation test,the ideal interval on the ratio has not yet reached agreement.