Brassieres have functions of adjusting breast shape and controlling breast vibration. Sports brassieres are used for restraint of breast vibration during exercise. However, characteristics of breast vibration during exercise are not known well. In the present paper, we clarified effects of restraints by a sports brassiere and proposed a method to reflecting the characteristics of breast vibration on brassiere design. In the experiment of breast vibration, subjects walked (2steps/sec) or ran (3steps/sec) on a treadmill under two conditions (1) naked and (2) wearing a sports brassiere. We recorded the change of coordinate values of the predetermined points on the left breast. After calibrating the measured data and subtracting body movements from them we extracted the vibration of the breast. As a result of a discrete Fourier transformation (DFT), it was found that soft parts of the breast vibrated largely, breast vibration was influenced by an exercise period and there were effects of restraint by a sports brassiere. On the other hand, we used a three-dimensional body shape model for simulating change of shape and designing of clothes. We proposed a method of designing of a sports brassiere. In order to control and decrease breast vibration during exercise, especially to restrain upper-down direction of vibration, we need to design sports brassieres taking the magnitude of pressure and the parts to impose the pressure into consideration.

DESCENTE SPORTS SCIENCE Vol.23/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE