Experimental Study of Brest Vibration of Youths During Exercise

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Other Title
  • 若年者の運動時乳房振動に関する実験的研究
  • 若年者の運動時乳房振動に関する実験的研究 : ハイスピードカメラによる三次元動作解析
  • ジャクネンシャ ノ ウンドウジ チブサ シンドウ ニ カンスル ジッケンテキ ケンキュウ : ハイスピードカメラ ニ ヨル サンジゲン ドウサ カイセキ
  • ―ハイスピードカメラによる三次元動作解析―
  • ―3D Motion Analysis Using High Speed Cameras―

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<p>In order to design brassieres (bras) which effectively control breast vibration, the vibration of breasts was measured using high speed cameras during walking，running and jumping. The subjects consisted of eight young females with different sizes of breasts. By measuring skin viscoelasticity and compression of the breast, their relationships were compared with the breast vibration. The following results were obtained: 1. The breasts showed characteristics of vibration locus on the x,z plane during walking, running and jumping. The bigger the breast the greater the vertical amplitude of vibration; 2.A time lag between the movement of the breast and the body was shown on the z plane due to the inertial influence; 3. The average of amplitude, speed and acceleration of outside measuring points are greater than inside measuring points during walking, running and jumping, so that it is important to control the vibration of the outside breast during exercise. 4. The breast size has a high correlation with the average of amplitude and speed in both vertical and horizontal direction during walking or running, and those in vertical direction only during jumping. The average amplitude exhibits a positive correlation with the recovery rate of skin and a negative correlation with the compression stress ratio F10mm during running which showed that the softer the breast, the greater the vibration.</p>

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