运动速度及文胸支撑强度对乳房运动的影响

Effects of movement velocity and bra support condition on breast movement

为探究在运动中不同支撑强度文胸对乳房晃动的影响,本文选择3名75C罩杯女性和3件不同支撑强度文胸,利用QUALISYS动态捕捉仪采集了受试者在3种运动速度下的乳房位移数据。通过建立躯干坐标系,获得乳房相对躯干的位移,并运用SPSS进行统计分析。结果表明:随着运动速度的增加,乳房相对位移极差在X、Y、Z方向上均随之增大,且当速度从6 km/h增加到8 km/h时,乳房在Z方向上的增幅约为X方向的2倍;相较于普通文胸,高支撑运动文胸可减少乳房X、Y方向上约30%~50%的晃动,Z方向约20%~40%,总体优于中支撑运动文胸约5%~15%。对C罩杯女性而言,运动时穿着高支撑运动文胸可有效减小乳房三维晃动幅度,尤其是前后和左右方向的晃动。

With the wide spread of the concept of national fitness,a growing number of people begin to actively participate in all kinds of fitness sports.Fast walking and running are the most simple and common ways of fitness in life,which are beloved by the majority of females.However,the breast consists of mammary gland,fat and skin,without the hard support of bones.So in the process of physical exercise,the breast will shake violently by gravity and inertia,and pull the skin and connective tissue,making people feel uncomfortable.What’s more,long-term improper exercise will lead to breast ligament strain or even sagging.Especially for females with large breasts,exercise brings more serious impact on breast movement.Sports bras are designed to control excessive breast movement.Although there are many available sports bras with different support conditions in the market,many females do not pay attention to the importance of correctly wearing the bra when exercising.It also shows that the research on the specific effect of sports bras on breast movement is still insufficient.In order to explore the effects of bras with different support conditions on breast shaking during exercise,three females with a bra size of 75C and similar figures and three bras with different support conditions were selected,and the QUALISYS three-dimensional motion capture instrument was used to collect the displacement data of eight points of subjects at the movement velocities of 4 km/h(fast walking),6 km/h(jogging)and 8 km/h(running).The eight points include the nipple point and the points at the upper,lower,left and right 5cm of the nipple point on the breast site,and the suprasternal notch point,the xiphoid process point and the left anterior inferior rib(the inferior edge of the tenth rib,aligned with the nipple point)on the torso.Among them,the breast displacement data of the five points obtained from the experiment are related to the movement of the breast itself and the motion of the human torso.Through the establishment of the coronal trunk coordinate system,the breast displacement data in the geodetic coordinate system are transformed into the relative displacement data in the new reference coordinate system,that is,the breast displacement relative to the torso.The difference between the maximum value and the minimum value of relative displacement within a stable period(5 s)is called relative displacement differentiation of the breast,and it is statistically analyzed by SPSS.The results show that with the increase of sports speed,the value of relative displacement differentiation of the breast increases in X,Y and Z directions,and when the movement speed increases from 6 km/h to 8 km/h,the increase of the relative displacement differentiation of the breast in Z direction is about twice as much as that in X direction.Compared with the ordinary bra,the high support sports bra can reduce the displacement of the breast by about 30%-50%in the X and Y directions and about 20%-40%in the Z direction,which is generally better than the medium support sports bra by about 5%-15%.For C cup females,wearing a high support sports bra during exercise can effectively reduce the three-dimensional movement amplitude of breasts,especially in the front-back and left-right directions.Understanding the law of breast movement is helpful to standardize the design and development of high-performance sports bras,and at the same time provides a theoretical basis for reasonable purchase of consumers.In future studies,we can further increase the sample size of bras,expand the research group,and combine with subjective criteria to quantify the protective effect of sports bra on breasts,and get a full picture of the sports bra market.