Investigation of the effects of changes of the Breast's Position in the Function of the Shoulder Complex.

Abstract

[Purpose]The purpose of this study is to investigate the effect changes of the breast's position in the function of the shoulder complex.
[Materials and methods]Twenty-six healthy women were examined in this study. The age of subjects ranged from 22∼64 years old. We compared the naked breast with which underwear was worn on the breast and the function of the shoulder complex. (1)The difference of the breast's position. (2)The changes of the muscle hardness of the upper fiber of the M. trapezius using a muscle meter. (3)The changes of tilting angles of the scapula in the horizontal plane using the slant rules. (4)The difference of the angle in horizontal abduction of the shoulder joint.
[Results](1)The naked breast's position were lower than the ideal position. (2)There was a significant change. The hardness of the M. trapezius was lower with underwear compared to nakedness. (3)The tilting angles of the scapula decreased under the condition depending on which underwear was worn. (4)The angle in horizontal abduction of the shoulder joint extended to take the underwear.
[Conclusion]The function of the shoulder complex was influenced by the position of the breast.