Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (07): 133-137.doi: 10.13475/j.fzxb.20180603805

• Apparel Engineering • Previous Articles     Next Articles

Influence of bra underwire on vertical breast displacement

CHEN Xiaona1,2, WANG Erhui3   

  1. 1. Fashion College, Shanghai University of Engineering Science, Shanghai 201620, China
    2. Shanghai Institute of Design and Innovation, Tongji University, Shanghai 200080, China
    3. College of Fashion and Design, Donghua University, Shanghai 200051, China
  • Received:2018-06-11 Revised:2019-04-15 Online:2019-07-15 Published:2019-07-25

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Abstract:

In order to study whether adding underwire can effectively improve limitation of bra on women's vertical breast displacement during exercise, three dimensional motion capture system (NDI Optotrak Certus) was employed to collect the vertical breast displacement of 9 participants with the breast size of C cup, when they were wearing bras with and without underwire, exercising on the treadmill at three gait speeds (5, 7.5, 10 km/h). Meanwhile, visual analogue scale (VAS) was adopted to measure participants' perceived breast displacement and discomfort resulted from breast displacement in each motion state. The results show that adding underwire can effectively increase bra function on limiting vertical breast displacement of women with C cup size breasts when they are exercising on the treadmill. Similarly, adding underwire has a significant effect on reducing participants' perceived breast displacement and discomfort related to breast displacement. The control effect of underwire on vertical breast displacement increases with the acceleration of gait speed.

Key words: breast displacement, bra underwire, motion state, three-dimensional motion capture

CLC Number: 

  • TS941.17

Tab.1

Bra size and breast size of participants"

实验对象
编号		 文胸号型 胸部尺寸/cm
上胸围 胸围 下胸围
1# 85C 92.0 90.0 77.0
2# 85C 97.0 98.0 83.0
3# 85C 92.0 91.0 78.0
4# 75C 82.0 85.0 72.0
5# 75C 84.5 83.5 71.5
6# 75C 85.0 84.5 73.0
7# 75C 83.0 87.0 72.0
8# 75C 85.0 86.0 73.0
9# 75C 83.0 83.5 74.5
平均值 87.1 87.6 76.0

Fig.1

Photograph of experimental bra"

Fig.2

Three-dimensional motion capture system"

Fig.3

Displacement sensor"

Fig.4

Experimental measurement points"

Fig.5

Coordinate axis calibration"

Fig.6

Schematic diagram of relative breast displacement calculation in one gait cycle"

Tab.2

P values illustrating significant difference in vertical breast displacement data between two bra types in each motion state"

运动速度/(km·h-1) P值
5.0 0.001*
7.5 0.000*
10.0 0.000*

Tab.3

P values illustrating significant difference in subjective breast displacement, discomfort resulted from breast displacement and rating of perceived exertion between two bra types"

变量 P值
乳房位移 0.007*
乳房位移引起的不舒适感 0.025*
运动强度 1.000
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