Arch Elisa S, Colón Sarah, Richards James G
1 University of Delaware.
J Appl Biomech. 2018 Oct 1;34(5):392-395. doi: 10.1123/jab.2017-0111. Epub 2018 Oct 4.
Breast and bra motion research aims to understand how the breasts/bra move to aid development of apparel that minimizes motion. Most previously published research has tracked nipple motion to represent bra motion. However, this method does not provide information regarding regional tissue motion. A more comprehensive approach might facilitate understanding how the entire soft-tissue mass moves during physical activities. This study developed and tested an objective method to comprehensively measure 3-dimensional bra motion, including regional displacement and velocity, displacement phasing, and surface stretch. To test the method, 6 females were fitted with a minimally supportive, seamless bra (small bra n = 3; large bra n = 3). Data were collected as participants ran on a treadmill. Results indicated marker displacement, velocity, link stretch, and link stretch velocities reached as high as 52.6 (6.8) mm, 504.8 (88.7) mm/s, 29.5% (7.1%) of minimum length, and 3.8 (1.0) mm/s/mm, respectively, with the large bra having greater motions compared with the small. Most bra motion occurred above/below the nipple region and at the bra's strap-body interface, independent of bra size. Importantly, maximum marker displacement and velocity did not occur at the nipple. Measurements obtained from this new method may be important for designing innovative clothing that minimizes bra motion during physical activity.
乳房与胸罩运动研究旨在了解乳房/胸罩的运动方式，以助力开发能将运动减至最小的服装。此前大多数已发表的研究通过追踪乳头运动来代表胸罩运动。然而，这种方法无法提供有关局部组织运动的信息。一种更全面的方法可能有助于理解整个软组织团块在体育活动中的运动情况。本研究开发并测试了一种客观方法，用于全面测量胸罩的三维运动，包括局部位移和速度、位移相位以及表面拉伸。为测试该方法，让6名女性穿着支撑性最小的无缝胸罩（小胸罩3人；大胸罩3人）。在参与者在跑步机上跑步时收集数据。结果表明，标记点位移、速度、连接拉伸以及连接拉伸速度分别高达52.6（6.8）毫米、504.8（88.）毫米/秒、最小长度的29.5%（7.1%）以及3.8（1.0）毫米/秒/毫米，大胸罩的运动比小胸罩更大。大多数胸罩运动发生在乳头区域上方/下方以及胸罩肩带与身体的接口处，与胸罩尺寸无关。重要的是，标记点的最大位移和速度并非出现在乳头处。通过这种新方法获得的测量结果对于设计能在体育活动中使胸罩运动最小化的创新型服装可能具有重要意义。
