A study of antagonist/agonist isokinetic work ratios of shoulder muscles on experienced sport climbers

Pao Yue-kong Library Electronic Theses Database

A study of antagonist/agonist isokinetic work ratios of shoulder muscles on experienced sport climbers

 

Author: Wong, Kwai-lan
Title: A study of antagonist/agonist isokinetic work ratios of shoulder muscles on experienced sport climbers
Degree: M.Sc.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Shoulder -- Muscles.
Sports injuries.
Rock climbing.
Isokinetic exercise.
Department: Dept. of Rehabilitation Sciences
Pages: xiii, 84 leaves : ill. ; 31 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2090260
URI: http://theses.lib.polyu.edu.hk/handle/200/534
Abstract: Background: Sport climbers have high incidence of shoulder injuries, however, biomechanical studies of the shoulder of the sport climbers are lacking. Knowing the isokinetic work profile of the shoulder agonists and antagonists is important for these athletes as it could provide quantitative information on the relationships of the respective muscle groups and identify particular muscle imbalance. Objective: In this study, the isokinetic conventional and functional work ratios of two shoulder agonist/antagonist muscle pairs of sport-climbers were examined and compared with the non-climbers. The two shoulder agonist/antagonist muscle pairs tested were 1) flexors / extensors and 2) external/ internal rotators. Methods and Measure: Thirty-one elite sport climbers and 27 non-climbers with mean age of 28 to 33 years were tested. Isokinetic works of shoulder, including concentric flexion and extension (con F, con E), eccentric flexion and extension (ecc F, ecc E), concentric external and internal rotations (con ER, con IR) and eccentric external and internal rotations (ecc ER, ecc IR) were measured at a speed of 60o/s for all subjects. Conventional work ratios of con F/E, con ER/IR, ecc F/E and ecc ER/ IR and functional work ratios of ecc F/ con E, ecc ER/ con IR, ecc E/ con F and ecc IR/ con ER were then worked out. Result: All the work ratios found were significantly different between the climbers and the non-climbers (p< 0.005). All the mean conventional work ratios in the climbers (i.e. con F/E = 0.74, ecc F/E = 0.74, con ER/IR = 0.79 and ecc ER/IR = 0.88) were lower than 1 and these were smaller than those of the non-climbers (con F/E = 1.13, ecc F/E = 1.05, con ER/IR = 1.03 and ecc ER/IR= 1.13). Regarding the mean functional work ratios, the ecc F/con E and ecc ER/con IR in the climbers (0.90 and 1.05, respectively) were approaching 1:1 but these were lower than the non-climbers (1.46 and 1.30 respectively). The work ratios of ecc E/ con F and ecc IR/con ER, they were 1.73 and 1.58 respectively in the climbers which were higher than the non-climbers (1.28 and 1.17, respectively). Conclusion: From a functional point of view, the differences in work ratios in the two groups indicated differences in work profiles of the shoulders which could be a result of training-induced changes in the sport climbers. With reference to the work ratios in the sport climbers, training programs for the shoulders that have a balance on achieving functional needs and preventing pathological muscle imbalance are recommended for this athletic population.

Files in this item

Files Size Format
b20902608.pdf 10.92Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information