Further research at the University of Portsmouth by Debbie Risius has shown that sports bras may need to account for differences linked to age as well as size. Her research has shown that younger women's breasts experience more up and down motion whereas older women (45+) experience more side to side and in-out movement of the breasts. This suggests that standard sports bra may not be suitable for all ages of women. Therefore, designs must be adapted to create bras for older women that will support the specific movement shown by the breasts. This may encourage more older women to participate in sport and to feel more comfortable whilst doing so.