Here are some of the latest health and medical news developments, compiled by editors of HealthDay:
Exercise Decreases Risk of Pregnancy-Related Depression
Exercising and remaining upbeat about their changing shapes may reduce the risk of depression among pregnant women, say U.S. researchers who surveyed 230 women in Pennsylvania throughout their pregnancy and into the postpartum period.
The women were asked about their exercise habits, feelings about weight, appearance and other body image aspects, and about symptoms of depression, United Press International reported.
Women who did more exercise prior to pregnancy were more satisfied with their bodies during the second and third trimesters, and had fewer depressive symptoms in the second trimester than other women.
"Our study supports the psychological benefits of exercise to improve body image and lessen depressive symptoms," lead researcher Danielle Downs, of Pennsylvania State University, said in a news release, UPI reported.
The study appears in the August issue of the journal Annals of Behavioral Medicine.
Lap-and-Shoulder Belts Equal to Child Safety Seats in Injury Prevention
Among children ages 2 to 6, lap-and-shoulder safety belts are as effective as child safety seats in preventing serious injuries in traffic crashes, says a study by researchers at the University of Chicago and the Massachusetts Institute of Technology.
But their analysis of three large representative samples of crashes and related hospital data did show that child safety seats are 25 percent more effective at reducing less serious injuries, United Press International reported.
Lap belts alone aren't as effective as child safety seats or lap-and-shoulder seat belts, but are far better than riding unrestrained, the researchers said.
The study appears in the journal Economic Inquiry.
All states require the use of child safety seats and the minimum age and weight requirements for children's use of seat belts has been increasing over time, UPI reported.
Urine Test Could Identify Cattle With Mad Cow Disease
Cattle infected with mad cow disease have elevated protein levels in their urine, a finding that could help lead to the development of a screening test for live animals, Canadian and German researchers announced. Currently, the only way to test for mad cow disease is after cattle have been killed.
"We're pretty excited about it," lead researcher David Knox told the Canadian Press. "It would be sort of like a home pregnancy test. You would just put a strip in the stream of urine and it either comes out positive or negative. Ideally, that's what we'd like to have."
The discovery of elevated protein levels in cattle with mad cow disease was made in tests conducted on four infected cows. The study appears in the journal Proteome Science.
The results also suggests it may be possible to develop a urine test to diagnose people with the degenerative and fatal brain disorder Creutzfeld-Jakob disease and other forms of unexplained dementia, Knox told CP.
Bacteria Produce Proteins That Attack Lungs of Cystic Fibrosis Patients