Volume 45, Issue 3 (9-2021)                   Research in Medicine 2021, 45(3): 67-71 | Back to browse issues page

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Hosseinimehr S H, Anbarian M. The Effect of Some Shoulder Girdle Muscles Fatigue After a Resistance Training Session and a Volleyball Training Session on Scapular Resting Position and Scapulohumeral Rhythm Ratio. Research in Medicine. 2021; 45 (3) :67-71
URL: http://pejouhesh.sbmu.ac.ir/article-1-2433-en.html
Department of Physical Education and Sport Sciences, Faculty of Humanities and Social Sciences, University of Kurdistan, Sanandaj, Kurdistan, Iran , hosseinimehrhossein@gmail.com
Abstract:   (1712 Views)
Background and Aims: Previous studies have shown that shoulder muscle fatigue has direct effectson scapula and humerus motions. Hence, kinematics of the shoulder joint depends largely on the muscles around it. The purpose of the present study was to investigate the effect of some shoulder girdle muscles fatigue after a  resistance training session and a volleyball training session on scapular resting position and scapulohumeral rhythm ratio in volleyball players.
 Materials and Methods: In a experimental study, a total of 30 male volleyball players were randomly selected. The fatigue protocol consisted of a resistance training session (front and back barbell shoulder press, wide grip lat pull-down, machine shoulder press, and chin up) and a volleyball training session. Two inclinometers were used to measure humeral abduction and scapular up or dawn ward rotation in scapular resting position, °90 ,°45, and °135 shoulder abduction in frontal plane. The  articipants performed humeral abduction with dominant shoulder in frontal plane.Scapulohumeral rhythm ratio was calculated from division humeral abduction to upward rotation of the scapula from scapular resting position to °90 ,°45, and °135 from °45 to °90 and from °90 to °135 humeral abduction in frontal plane. In the first session, scapular kinematic measurements were performed and then one of the fatigue protocols were performed randomly and finally scapular kinematic measurements were performed again. On the second session, other fatigue protocols were performed. Paired sample t-test was used to determine the difference between pretest and posttest.The level of significance was set at α< 0.05.
Results: The results showed that shoulder girdle muscles fatigue after a volleyball training session has no significant effect on scapular resting position and scapulohumeral rhythm ratio (p=0.14). Also, it was found that shoulder girdle muscles fatigue after a resistance training session has no significant effect on scapular resting position but it has a significant effect on scapulohumeral rhythm ratio in °135 shoulder abduction (p=0.03).
Conclusion: It seems that excessive shoulder girdle muscles fatigue can result in scapulohumeral rhythm ratio dysfunction and shoulder disorders.
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Type of Study: Original | Subject: Physical medicine and rehabilitation - Physiotherapy - Occupational therapy
Received: 2020/03/3 | Accepted: 2020/06/16 | Published: 2022/01/9

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