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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .Women might expect to need new clothes after giving birth.
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3 .But a bigger pair of shoes? Well, yeah.
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4 .Because pregnancy can actually lengthen and widen a woman's feet.
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5 .That's according to a study in the American Journal of Physical Medicine and Rehabilitation that's probably not a surprise to a lot of women.
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6 .Neil Segal, a rehab doc at the University of Iowa, heard that some local women had to don larger shoes after pregnancy.
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7 .So he and colleagues measured the feet of 49 women during their first trimester and again five months after childbirth.
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8 .Indeed, nearly half the women went up a shoe size after childbirth, to accommodate their longer, flatter feet.
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9 .And multiple pregnancies may add to that effect, Segal says.
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10 .Pregnant women produce a hormone called "relaxin," which makes the pelvis more flexible.
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11 .That's good for childbirth.
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12 .But the hormone can affect joints and ligaments elsewhere, like in the foot.
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13 .Adding pregnancy weight to that flexibility can lead to permanent flattening of the foot's arch--associated with knee and hip pain in older women.
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14 .Segal's now investigating whether custom shoe inserts can protect women against that risk, and help get motherhood off on the right foot.
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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