견관절 외전시 삼각근과 극상근의 활동전위의 정량적 분석

박정미,오한선,이종민 大韓再活醫學會 1998 Annals of Rehabilitation Medicine Vol.22 No.1

Comparison of Scapular Kinematics During Active Shoulder Horizontal Adduction Between Subjects With and Without Limited Range of Motion of Shoulder Horizontal Adduction

( Ha Na Joung ),( Moon Hwan Kim ),( In Cheol Jeon ),( Pt Ui Jae Hwang ),( Oh Yun Kwon ) 한국전문물리치료학회 2016 한국전문물리치료학회지 Vol.23 No.3

Background: Shoulder horizontal adduction (HA) is performed in many activities of daily living. The limited range of motion (LROM) of HA is affected by the tightness of the posterior deltoid, infraspinatus, teres major, and posterior capsule of glenohumeral joint. The LROM of shoulder HA contributes to excessive scapular abduction. Objects: The aim of this study is to compare the scapular abduction distance and three dimensional displacement of the scapula during shoulder horizontal adduction between subjects with and without the LROM of shoulder HA. Methods: 24 subjects (12 people in LROM group and 12 people in normal ROM group) participated. Subjects with less than 115° of HA ROM were included in LROM group. Shoulder HA was performed 3 times for measuring scapular abduction distance and three-dimensional displacement of the scapula. Tape measure was used for measuring scapular abduction distance. Scapular abduction distance was normalized by dividing the scapular size. Polhemus Liberty was used for measuring the three dimensional displacement of the scapula. Results: Normalized scapular abduction distance was significantly greater in LROM group than normal ROM group (p<.001). Three-dimensional displacement of the scapula during shoulder HA was greater in LROM group than normal ROM group (p<.05). Conclusion: LROM group had a greater scapular abduction and three-dimensional displacement of the scapula during shoulder HA compared to normal ROM group.

거북목을 가진 젊은 남성의 팔의 굽힘과 벌림 운동 시 목과 등어깨 근육의 근 활성도에 대한 머리자세 교정의 영향: 단일그룹 반복측정 연구

오동식 한국신경근육물리치료학회 2024 한국신경근육재활학회지 Vol.14 No.2

This study investigated the effects of head postural correction on muscle activity during shoulder flexion and abduction. Twenty-four male participants with forward head posture (FHP) and no history of neurological or musculoskeletal surgery or injury were recruited. Their muscle activity was analyzed before and after head correction during shoulder abduc tion and flexion. Muscle activity and onset time were assessed using wireless surface elec tromyography of the right splenius capitis (SC); sternocleidomastoid (SCM); upper, middle, and lower trapezius (UT, MT, LT); and serratus anterior (SA) during shoulder movement. Shoulder abduction and flexion in FHP and neutral head posture (NHP) were compared us ing a paired t-test, and the main effects and interactions of head posture and shoulder movements were determined using a 2 × 2 repeated-measures analysis of variance using head posture and shoulder movements. When comparing shoulder abduction and flexion in the FHP, the muscle activities of the SCM and MT were significantly increased in abduc tion (p<.05). Muscle activity in all muscles except the SC and SA was significantly lower in NHP than in FHP inboth abduction and flexion (p>.05). Muscle onset time did not sig nificantly differ between the FHP and NHP groups (p>.05). However, the MT moved first in abduction in the FHP and NHP, UT in flexion in the FHP, and SA in the NHP. In this study, the muscle activity differed during abduction and flexion in the FHP. Therefore, arm movement may be useful in clinical practice to improve FHP symptoms, and these research results may be used as basic data for FHP.

Comparing Muscle Activity and Onset Time of Cervical and Thoracoscapular Muscles during Shoulder Flexion and Abduction in Individuals with and without Forward Head Posture

오동식 국제물리치료연구학회 2024 Journal of International Academy of Physical Ther Vol.15 No.2

Background: Forward head posture affects many individuals and can cause pain and dysfunction in the muscles and joints of the head, neck, and shoulders. Objectives: This study aimed to assess muscle activity and onset time of cervical and scapular muscles during 180° shoulder flexion and abduction in individuals with normal head posture (NHP) and in those with forward head posture (FHP), both before and after correction. Design: Cross-sectional study. Methods: Thirty-six individuals were divided into FHP and NHP groups. Muscle activity and muscle contraction onset time of the splenius capitis, sternocleidomastoid, upper middle and lower trapezius, and serratus anterior muscles were measured during shoulder flexion and abduction using wireless surface electromyography. Results: The FHP group exhibited increased muscle activity compared to the NHP group (P<.05), notably in the sternocleidomastoid and middle trapezius muscles, more so during shoulder abduction than flexion (P<.05). Regarding muscle contraction onset time, sternocleidomastoid onset was fastest during shoulder abduction in the FHP group (P<.05), while serratus anterior onset was slowest during both shoulder abduction and flexion (P<.05). Conclusion: These findings highlight distinct muscle activity and muscle contraction onset time patterns based on head posture and shoulder movement. Selective muscle activation strategies may help reduce heightened sternocleidomastoid and trapezius activity and enhance serratus anterior engagement in individuals with FHP.

아래등세모근 강화운동 시 어깨관절의 벌림 각도에 따라 둥근 어깨에 미치는 영향

김현수,한지원,이건철 대한통합의학회 2023 대한통합의학회지 Vol.11 No.1

Purpose : The purpose of this study is to find out which shoulder abduction angle among the three representative angles of lower trapezius strengthening exercises most effectively improves rounded shoulder posture. Methods : Thirty-one people with rounded shoulders, the subjects of this study, were selected. With the use of a random number table, group A was randomly assigned to a Y-type exercise, group B to a T-type exercise, and group C to an MPC exercise. In the prone position, both arms are abducted at the angles suggested for each group (145 °, 90 °, and 45 °, respectively), and the hands are holding dumbbells to assume a functional posture. With the start signal, the thumb raised the arm to the sky and the arm is raised to the level of the ear for 10 seconds and then returned to the original position. Each week, the strength required was increased by changing the resistance weight, number of times, and set, and the exercise was performed three times a week for a total of four weeks. Results : There was a significant difference in the change in shoulder height of each group after four weeks of exercise in comparison to the amount of change in height before and after exercise in all groups (p<.05). However, no significant difference was observed between all groups in the change in muscle activity of the lower trapezius muscle in each group following four weeks of exercise (p>.05). Conclusion : The results of this study showed that the three lower trapezius strengthening exercises have a positive effect on the improvement of rounded shoulders. In consideration of these results, it is therefore proposed that the various lower trapezius strengthening exercises be applied in parallel during physical therapy for patients with rounded shoulders in clinical practice.

Effect of rotator cuff tears on teres minor force during shoulder abduction

이동환,김판권,신충수 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

Though the importance of teres minor for shoulder function during elevation has been reported, the role of teres minor during abduction remains unclear. The purpose of this study was to examine the effect of rotator cuff tears on teres minor force during abduction. The human in vivo experimental data were used as an input to subject-specific musculoskeletal model during abduction in the coronal plane. Inverse dynamics simulations were performed to compute the required shoulder muscle forces following different rotator tear patterns: intact, posterosuperior (infraspinatus and supraspinatus), and massive (infraspinatus, supraspinatus, and subscapularis) tears. The teres minor was not active in intact model whereas posterosuperior and massive tear models required 51.63N and 35.91N of the peak teres minor force during abduction, respectively. Our results suggest that the teres minor can compensate for the functional loss of rotator cuff. In posterosuperior tear model, the teres minor seems to counterbalance the subscapularis by providing greater force compared with massive tear model. In conclusion, the teres minor is primarily required for shoulder abduction when rotator cuff tear occurred.

랩탑 컴퓨터 터치패드와 클릭버튼 위치에 따른 손목과 어깨 부위 근육의 EMG 진폭 및 중앙 주파수 변화

한승조(Han, Seung-Jo),김선욱(Kim, Sun-Uk),구교찬(Koo, Kyo Chan) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.3

본 논문의 목적은 랩탑 컴퓨터의 터치패드 및 두 개의 클릭 버튼 위치에 따른 손목과 어깨 부위 근육의 EMG 진폭 및 중앙 주파수 변화를 알아보는 것이다. 기존 연구결과를 바탕으로 손목과 어깨의 외전현상이 근골격계 질환으로 이어지는 메커니즘을 살펴보고, 이를 토대로 연구가설이 설정되었다. 실험에서 터치패드 및 클릭버튼의 위 치는 기존의 중앙 아래(bottom center, BC)와 중앙 아래에 위치하지만 45˚ 반시계방향으로 회전된 방식(bottom center with rotation, BCR), 그리고 회전없이 중앙 오른쪽에 위치한 경우(bottom right, BR)가 비교되었다. 10명의 피실험자는 오른 손으로 5분 동안 터치패드 및 두 개의 버튼을 이용하는 task를 각각의 시행하는 동안 EMG 진폭과 중앙 주파수 가 측정되었다. 손목 부위의 근육은 척측수근굴근, 어깨부위의 근육은 위쪽 승모근이 선정되었다. 실험결과 손목부위 에서는 BC의 경우가 진폭은 크게 나타나고 중앙 주파수는 작게 나타났으며, 어깨부위에서는 BC와 BCR이 BR보다 진폭은 크고 중앙 주파수는 작게 나타났다. 또한, 손목부위에서는 진폭과 중앙 주파수 모두에서 BCR과 BR의 차이가 유의하게 나타나지 않았고, 어깨부위에서는 BC와 BCR에서의 차이가 나타나지 않았다. 이러한 결과는 BC에서는 손 목과 어깨의 외전이 동시에 나타나고, BCR은 어깨의 외전만, 그리고 BR은 손목과 어깨에서 외전이 모두 나타나지 않기 때문이다. The objective of this study is to investigate the association between touchpad &buttons locations in a laptop computer and EMG amplitude and median frequency in muscles related with wrist and shoulder. Based on previous studies it was shown how abductions in wrist and shoulder could cause musculoskeletal disorders in those body parts, on which research hypotheses were established. Touchpad &buttons positions consisted of bottom center(BC), bottom center with 45˚rotation counterclockwise(BCR), and bottom right(BR). 10 subjects performed the task that required only touchpad &buttons usage with their preferred hand and EMG amplitude and median frequency data were recorded during 5min and analyzed afterwards. Upper trapezius and flexor carpi ulnaris were selected as target muscles. The results showed that in flexor carpi ulnaris BC resulted in greater amplitude and less median frequency than BCR and BR, but there was no significant difference between BCR and BR. In upper trapezius BC and BCR induced higher amplitude and lower median frequency than BR, but the significant difference between BC and BCR was not observed. Those phenomena occurred since BC gave rise to both wrist and shoulder abduction, BCR caused only shoulder one, and BR did not lead to abductions in both wrist and shoulder.

어깨관절벌림 각도에 따른 어깨주변 근육들의 참여 비율에 대한 연구

박민철 ( Park Minchull ),이상열 ( Lee Sangyeol ) 대한통합의학회 2017 대한통합의학회지 Vol.5 No.2

Purpose: The purpose of this study was to determine the muscle activity ratio according to the shoulder abduction angle by identifying the mean muscle activities and calculating the muscle ratios for use in developing strengthening methods. Methods: The participants were healthy adults in their 20s (n=19). The activity of the deltoid middle, upper trapezius, middle trapezius, and lower trapezius muscles was measured by 8-channel surface electromyography. Muscle activity was measured during 4 conditions of angle of shoulder abduction: 30°, 60°, 90°, and 120°. The data used in the analysis were the root mean square and % total muscle activity values. Results: The root mean square values for the deltoid middle, upper trapezius, middle trapezius, and lower trapezius muscles showed significant differences. No significant differences were detected in the % total muscle activity of the deltoid middle, upper trapezius, middle trapezius, or lower trapezius muscles. Conclusion: Future studies aimed at developing selective shoulder abductor muscle strengthening methods are likely to provide more effective results by using muscle activity ratios.

젊은 남성에서 부하 적용이 어깨 벌림 동안 봉우리밑 공간 간격에 미치는 영향

박강희 ( Park Kanghui ),박한규 ( Park Hankyu ),박수경 ( Park Sookyoung ) 대한통합의학회 2020 대한통합의학회지 Vol.8 No.1

Purpose : This study was performed to comparison of distance change of subacromial space according to shoulder abduction angle in loaded and unloaded conditions. Methods : The subjects were 20 male college students, and the subacromial space was measured using an ultrasound diagnostic apparatus. The participants shoulder abduction was measured during each shoulder resting position and 45 ° abduction with loads of 1 ㎏, 2 ㎏, 3 ㎏. The collected data were analyzed by a paired t-test and repeated measure ANOVA with the SPSS (Ver. 22) program. Results : The subacromial space showed statistically significant decreased in 45 ° abduction than resting position (p<.001). All the subacromial space increased during the according to loads (1 ㎏, 2 ㎏, 3 ㎏) at the resting position but at 45 ° abduction showed statistically significant decreased as the load increases (p<.05). Also, subacromial space showed significant changes in the 2㎏, 3㎏ compared with the 0㎏ loads. Conclusion : These results identified that shoulder abduction angle and load were related to subacromial space. When resting position, subacromial space is larger at loads than unload. As the load and shoulder abduction angle increase, subacromial space is reduced compared to resting.

Comparison of Shoulder Abduction Range of Motion in Glenohumeral Joint in Individuals with and without Myofascial Trigger Points in the Upper Trapezius

김현아,권오윤 KEMA학회 2023 근골격계과학기술학회 Vol.7 No.1

Background Myofascial trigger points in upper trapezius are common in people with shoulder pain. However, there are few studies that have observed the shoulder abduction range of motion in glenohumeral joint in individuals who have upper trapezius pain with myofascial trigger points. Purpose The purpose of this study was to compare the glenohumeral joint abduction range of motion between individuals with and without upper trapezius pain. Study design Cross-sectional study. Methods Twenty-four subjects who had upper trapezius pain with myofascial trigger points and 24 sex-, age-, and weight- matched subjects who had no upper trapezius pain and myofascial trigger points participated. The shoulder abduction range of motion was measured with and without restricted scapular motion in both groups. Smart KEMA strength measurement system was used to restrict scapular motion. Results The glenohumeral joint abduction range of motion measured with restricted scapular motion was significantly decreased in the upper trapezius pain group compared to the control group (p<0.05). However, the general shoulder abduction range of motion had no significant difference between groups (p>0.05). Conclusions It was investigated that individuals with upper trapezius pain accompanied by myofascial trigger points had decreased shoulder abduction range of motion in the glenohumeral joint. This finding suggests that abduction range of motion in the glenohumeral joint with restricted scapular motion should be considered in evaluating and treating people with upper trapezius pain.