女性乳房組織較發達時，參與運動時會因重力的作用，使乳房產生較大的晃動與位移(Gehlsen & Stoner, 1987)。本研究希望藉由跳躍動作，來評估穿著不同款式內衣之間支撐度的差別，並以乳房舒適感探討其相關性進行研究。乳房為懸吊型器官，無額外的支撐，為全身唯一沒有任何骨骼與肌群支撐的部位，乳房過度運動會造成乳房組織結構型變與下垂，對於女性在生心理上易產生影響。本實驗招收12名罩杯為C罩杯排球運動員，使用動作分析系統與測力板，擷取擺臂下蹲跳之跳躍動作表現，比較六個分期中，穿著不同內衣其乳頭在空間中各階段的支撐情況。本研究使用重複量數單因子變異分析 ，比較在穿著不同內衣時的乳房之最大位移、速度、加速度、G值與GRF之差異，此外使用相關係數來探討運動學參數與舒適量表之間的相關情形，顯著水準設定α=.05。結果中發現左邊與右邊乳房軌跡無差異，各項參數最大值皆出現在上下方向，而穿著內衣對於乳房支撐度具有一定的效果，其中運動內衣在左右與上下方向的支撐度，明顯優於其他種款式之內衣。另外乳房會相對身體產生運動，而在垂直方向的運動，會對女性會產生較大的影響，其中乳房之速度與加速度更可能為影響運動時舒適感的一大因素之一。隨著女性運動人口上升的趨勢，帶動提升女性運動周邊商品，不過卻沒有指標性的研究與分析提供消費者做為購買內衣時之參考依據，期望未來研究能對不同族群與比較更多款式之內衣，做更深入與廣泛的研究，提供社會大眾能更了解女性的乳房，且在運動時女性能正確的挑選合適類型的內衣參與運動。

This study attempted to evaluate kinematic of the breast with different breast support during the jumping maneuvers. Twelve C cup female volleyball athletes were recruited in this study. Markers were attached to the subject’s nipples and trunk to calculate relative 3D breast kinematics data. The subject had to wear four kinds of bras (no bra, normal bra, fashion bra, and sport bra) to evaluation of breast support in the mediolateral, anterioposterior, and vertical directions. Results of current study showed that the sports bra was effective in reducing the amplitude of breast displacement, velocity, acceleration, and comfort scale during jumping than no bra situation, everyday bra, and fashion bra. Future studies should be recruited more subjects and different types of sports bras in order to identify 3D breast kinematics with different bras during jumping maneuvers.

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