During 2007, scientist Doctor Joanna Scurr of the University of Portsmouth conducted a motion study of seventy women while running. They represented the widest range of breast sizes ever studied, from A up to JJ. Glamour model Jordan, whose bra cup size is F, is six cup sizes smaller than Scurr’s biggest breasted subject. Scurr found that breasts move in three planes of motion during exercise - vertically, horizontally, and laterally, in an overall figure-8 motion. Unrestrained movement of large breasts may contribute to sagging over time. Motion studies have revealed that when a woman runs, more than 50% of the breast's total movement is vertical, 22% side-to-side, and 27% in-and-out. The 2007 study found that encapsulation-type sports bras, in which each cup is separately molded, are more effective than compression-type bras, which press the breasts close to the body, at reducing total breast motion during exercise. Encapsulation bras reduce motion in two of the three planes, while compression bras reduce motion in only one plane. Previously, it was commonly believed that a woman with small to medium-size breasts benefited most from a compression-type sports bra, and women with larger breasts need an encapsulation-type sports bra. Scurr's research has shown that this is not true.