학술논문
정상 성인에서 등척성 위팔바깥돌림 운동 시 지레팔 위치 변화에 따른 어깨주변근육들의 근활성도에 미치는 영향 / Change of Muscular Activity of the Muscle Around the Shoulder Following the Lever Arm Position Change during an Exercise of Isometric External Rotation of the Upper Arms in Normal Adults
Document Type
Dissertation/ Thesis
Author
Source
Subject
Language
Korean
Abstract
본 연구는 등척성위팔바깥돌림 운동 시 아래팔의 지레팔 위치변화에 따라 가시아래근과 어깨주변근육에 어떠한 영향을 미치는지 알아보고자 하였다.대상자30명은 바로선 자세에서 팔꿈관절을 90도로 굽힘한 상태에서 저항면을 최대등척성수축으로 바깥돌림 하여 실험 하였다. 먼쪽, 중간쪽, 몸쪽 부분의 저항면을 무작위로 실시하여 운동을 수행하는 동안 근육의 활성도를 근전도를 통하여 최대수의적수축에 대한 백분율로 표준화 하였다. 그 결과 먼쪽의 지레팔의 저향면에서 가시아래근의 활성이 가장높게 나타났으며, 위등세모근과 중간삼각근의 근활성은 최대로 낮게 나타났다. 중간과 몸쪽지레팔의 저항면 간의 유의한 차이는 없었다. 본 연구결과 등척성위팔바깥돌림 운동시 가장먼쪽의 지레팔에서 운동하는 것이 가시아래근의 활성은 높이면서 위등세모근과 중간삼각근의 활성을 낮출수 있는 가장좋은 운동방법이었다.
This study attempts to examine the effect of lever arm positional change of the forearm on the infraspinatus and adjacent shoulder muscles during an exercise of isometric external rotation of the upper arm. In this investigation, thirty (30) subjects performed external rotation with maximum isometric contraction against resistance while flexing their elbow joints 90° in a standing-up posture. Subjects carried out an exercise against resistance of distal, intermediate or proximal aspect randomly. While performing the exercise, muscular activation was standardized as % maximal voluntary contraction (% MVC) by using the data from electromyography. The results showed that activation of the infraspinatus muscle was the highest against resistance for the farthest lever arm. Muscular activation of the upper trapezius or middle deltoid muscle was shown to be the lowest. There was no significant difference in resistance between intermediate and proximal lever arms. The results of this study showed that an exercise of the lever arm on the farthest distal aspect during an exercise of isometric external rotation of the upper arm would be the best exercising method, with which activation of the infraspinatus muscle could be increased while lowering activation of the upper trapezius or middle deltoid muscle.
This study attempts to examine the effect of lever arm positional change of the forearm on the infraspinatus and adjacent shoulder muscles during an exercise of isometric external rotation of the upper arm. In this investigation, thirty (30) subjects performed external rotation with maximum isometric contraction against resistance while flexing their elbow joints 90° in a standing-up posture. Subjects carried out an exercise against resistance of distal, intermediate or proximal aspect randomly. While performing the exercise, muscular activation was standardized as % maximal voluntary contraction (% MVC) by using the data from electromyography. The results showed that activation of the infraspinatus muscle was the highest against resistance for the farthest lever arm. Muscular activation of the upper trapezius or middle deltoid muscle was shown to be the lowest. There was no significant difference in resistance between intermediate and proximal lever arms. The results of this study showed that an exercise of the lever arm on the farthest distal aspect during an exercise of isometric external rotation of the upper arm would be the best exercising method, with which activation of the infraspinatus muscle could be increased while lowering activation of the upper trapezius or middle deltoid muscle.