Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15552
Title: A study of antagonist/agonist isokinetic work ratios of shoulder rotators in men who play badminton
Authors: Ng, GYF 
Lam, PCW
Keywords: Concentric contraction
Eccentric contraction
Muscle assessment
Sports
Strength profile
Issue Date: 2002
Publisher: American Physical Therapy Association, Orthopedic Section
Source: Journal of orthopedic and sports physical therapy, 2002, v. 32, no. 8, p. 399-404 How to cite?
Journal: Journal of orthopedic and sports physical therapy 
Abstract: Study Design: Normative descriptive study. Objectives. Exploring the isokinetic work ratios of eccentric antagonist/concentric agonist shoulder rotators in the late cocking and deceleration phases of a forehand overhead smash in badminton players. Comparing the work ratios between dominant and nondominant shoulders. Background: The strength of shoulder muscles for badminton players has been studied but there is little information on the work output of these muscles for a specific range of movement. Methods and Measures: Twenty-five skilled men who play badminton at club level with a mean age of 29.4 years (SD = 6.1) were measured for concentric and eccentric isokinetic work (joules) of shoulder internal (IR) and external (ER) rotators on both upper extremities at 120°/s. Bilateral isokinetic work ratios for eccentric IR/concentric ER between 60° and 90° of shoulder external rotation were calculated to denote strength profile in the late cocking phase of the badminton smash. Work ratios for eccentric ER/concentric IR between 10° external rotation and 30° internal rotation were calculated to denote strength profile in the deceleration phase of the badminton smash. The respective work ratios were compared between both shoulders. Result: The eccentric IR/concentric ER work ratios in late cocking were 1.9:1 and 1.3:1 (P = 0.001) for the dominant and nondominant shoulders, respectively. The eccentric ER/concentric IR work ratios in the deceleration phase were 1.1:1 and 1.3:1 (P = 0.003) for the dominant and nondominant shoulders, respectively. Conclusion: The work ratios of eccentric antagonist/concentric agonist are different between dominant and nondominant shoulders of skilled badminton players. Rehabilitation for injuries of these athletes should aim at developing the optimal antagonist/agonist work ratios to return them to this sport.
URI: http://hdl.handle.net/10397/15552
ISSN: 0190-6011
EISSN: 1938-1344
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