A Comparison of Shoulder Muscle Activities on Sitting Posture and Shoulder Angle
2
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Background: Sitting posture influences movements of scapulothoracic and glenohumeral joints and changes the shoulder muscle activities. The development and maintenance of correct sitting posture is important for the fundamental treatment of shoulder pain during rehabilitation. Objects: The purpose of this study was to investigate the effects of the sitting postures and the shoulder movements on shoulder muscle activities for both male and female. Methods: Twenty-eight subjects without shoulder-related diseases participated in this experiment. The subjects had randomly adopted three different sitting postures (upright posture, preferred posture, maximum slouched posture) and shoulder flexion angles in scapular plane (30˚, 90˚, 120˚). Surface electrodes were collected from upper trapezius (UT), anterior deltoid (AD), and posterior deltoid (PD) and the active shoulder range of motion was measured in each sitting posture and shoulder flexion angle. Results: The active range of motions of the shoulder external rotation and the flexion in the scapular plane decreased from the upright posture to the maximum slouched posture (p<.05, mixed-effect linear regression with random intercept, Tukey post-hoc analysis). All muscles showed the highest EMG activities at 120˚ shoulder flexion with the maximum slouched posture and did not show the gender differences. Conclusion: Increased shoulder muscle activities may become the potential risk factor for the shoulder impairment and pain if people continuously maintain the maximum slouched posture. Therefore, an upright position is necessary during shoulder exercises, as well as in activities of daily living, including motions involving lifting the arms.
Abstract
Background: Sitting posture influences movements of scapulothoracic and glenohumeral joints and changes the shoulder muscle activities. The development and maintenance of correct sitting posture is important for the fundamental treatment of shoulder pain during rehabilitation. Objects: The purpose of this study was to investigate the effects of the sitting postures and the shoulder movements on shoulder muscle activities for both male and female. Methods: Twenty-eight subjects without shoulder-related diseases participated in this experiment. The subjects had randomly adopted three different sitting postures (upright posture, preferred posture, maximum slouched posture) and shoulder flexion angles in scapular plane (30˚, 90˚, 120˚). Surface electrodes were collected from upper trapezius (UT), anterior deltoid (AD), and posterior deltoid (PD) and the active shoulder range of motion was measured in each sitting posture and shoulder flexion angle. Results: The active range of motions of the shoulder external rotation and the flexion in the scapular plane decreased from the upright posture to the maximum slouched posture (p<.05, mixed-effect linear regression with random intercept, Tukey post-hoc analysis). All muscles showed the highest EMG activities at 120˚ shoulder flexion with the maximum slouched posture and did not show the gender differences. Conclusion: Increased shoulder muscle activities may become the potential risk factor for the shoulder impairment and pain if people continuously maintain the maximum slouched posture. Therefore, an upright position is necessary during shoulder exercises, as well as in activities of daily living, including motions involving lifting the arms.
참고문헌 (26)
- Alizadehkhaiyat O, "Electromyographic analysis of shoulder girdle muscles during common internal rotation exercises", Int J Sports Phys Ther, 10(5), pp.645~654 (2015)
- Brookham RL, "Upper limb posture and submaximal hand tasks influence shoulder muscle activity", Int J Ind Ergon, 40(3), pp.337~344 (2010)[DOI]
- Bullock MP, "Shoulder impingement: The effect of sitting posture on shoulder pain and range of motion", Man Ther, 10(1), pp.28~37 (2005)[DOI]
- Caneiro JP, "The influence of different sitting postures on head", neck posture and muscle activity, 2010, pp.15(1), 54~60
- Culham E, "Functional Anatomy of the Shoulder Complex", J Orthop Sport Phys Ther, 18(1), pp.342~350 (1993)[DOI]
- Ebaugh DD, "Three-dimensional scapulothoracic motion during active and passive arm elevation", Clin Biomech(Bristol. Avon), 20(7), pp.700~709 (2005)[DOI]
- Ekstrom RA, "Surface electromyographic analysis of exercises for the trapezius and serratus anterior muscles", J Orthop Sports Phys Ther, 33(5), pp.247~258 (2003)[DOI]
- Finley MA, "Effect of sitting posture on 3-dimensional scapular kinematics measured by skin-mounted electromagnetic tracking sensors", Arch Phys Med Rehabil, 84(4), pp.563~568 (2003)[DOI]
- Kanlayanaphotporn R, "Changes in sitting posture affect shoulder range of motion", J Bodyw Mov Ther, 18(2), pp.239~243 (2014)[DOI]
- Kebaetse M, "Thoracic position effect on shoulder range of motion strength, and three-dimensional scapular kinematics", Arch Phys Med Rehabil, 80(8), pp.945~950 (1999)[DOI]
- Seok Tae Lee, "Changes in Activation of Serratus Anterior, Trapezius and Latissimus Dorsi With Slouched Posture", Annals of Rehabilitation Medicine, 40(2), pp.318~325 (2016), 대한재활의학회
- Liu J, "Roles of deltoid and rotator cuff muscles in shoulder elevation", Clin Biomech (Bristol. Avon), 12(1), pp.32~38 (1997)[DOI]
- Ludewig PM, "Alterations in shoulder kinematics and associated muscle activity in people with symptoms of shoulder impingement", Phys Ther, 80(3), pp.276~291 (2000)
- Ludewig PM, "Three-dimensional scapular orientation and muscle activity at selected positions of humeral elevation", J Orthop Sports Phys Ther, 24(2), pp.57~65 (1996)[DOI]
- Ludewig PM, "The Association of Scapular Kinematics and Glenohumeral Joint Pathologies", J Orthop Sport Phys Ther, 39(2), pp.90~104 (2009)[DOI]
- Malmstromm EM, "A slouched body posture decreases arm mobility and changes muscle recruitment in the neck and shoulder region", Eur J Appl Physiol, 115(12), pp.2491~2503 (2015)[DOI]
- McLean L, "The effect of postural correction on muscle activation amplitudes recorded from the cervicobrachial region", J Electromyogr Kinesiol, 15(6), pp.527~535 (2005)[DOI]
- Nagai K, "Effects of trunk rotation on scapular kinematics and muscle activity during humeral elevation", J Electromyogr Kinesiol, 23(3), pp.679~687 (2013)[DOI]
- Nairn BC, "What is slumped sitting? A kinematic and electromyographical evaluation", Man Ther, 18(6), pp.498~505 (2013)[DOI]
- Neumann DA, "Kinesiology of the Musculoskeletal System: Foundations for rehabilitation", pp.149~151 (2017), Elsevier Inc.
- Nie HL, "Gender effects on trapezius surface EMG during delayed onset muscle soreness due to eccentric shoulder exercise", J Electromyogr Kinesiol, 17(4), pp.401~409 (2007)[DOI]
- O'Sullivan PB, "Effect of different upright sitting postures on spinal-pelvic curvature and trunk muscle activation in a pain-free population", Spine (Phila Pa 1976), 31(19), pp.(E)707~(E)712 (2006)[DOI]
- Pascarelli EF, "Understanding Work-Related Upper Extremity Disorders: Clinical Findings in 485 Computer Users, Musicians, and Others", J Occup Rehabil, 11(1), pp.1~21 (2001)[DOI]
- Schuldt K, "Effects of changes in sitting work posture on static neck and shoulder muscle activity", Ergonomics, 29(12), pp.1525~1537 (1986)[DOI]
- Sciascia A, "Electromyographical comparison of four common shoulder exercises in unstable and stable shoulders", Rehabil Res Pract, 2012, pp.783824~ (2012)
- Uga D, "Electromyographic analysis of the infraspinatus and scapular stabilizing muscles during isometric shoulder external rotation at various shoulder elevation angles", J Phys Ther Sci, 28(1), pp.154~158 (2016)[DOI]