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Women who attempt vaginal childbirth after having several babies by cesarean section may not have a greater risk of complications than women who have had only one prior C-section,suggests a study published in the journal BJOG. Researchers from Washington University School of Medicine found that women with at least three prior C-sections showed no increased risk of uterine rupture during vaginal delivery. The researchers reviewed the records of 25,000 women who gave birth after having at least one prior C-section. The group included 860 women with at least three prior C-sections,89 of whom attempted a vaginal delivery; the remaining 771 elected to have a repeat C-section. There were no cases of uterine rupture in either group.

ZERO TO 20

Exercise may not boost obese teens metabolism

A few months of moderate aerobic exercise may not rev up obese teenagers ability to burn calories,even though it may increase thinner teens ability to burn dietary fat,suggests a study published in the American Journal of Clinical Nutrition. In a study of 28 obese and normal-weight teenagers,researchers found that after 12 weeks of treadmill and exercise-bike sessions,the heavier teens showed no changes in their bodies calorie and fat-burning throughout the day. Their dietary-fat metabolism,however,did increase,on average.

20 TO 50

Occupation a key factor in mens lung cancer risk

Men who work in certain occupations continue to be at increased risk of lung cancer,suggest a study published in the American Journal of Epidemiology. In fact,about 5 per cent of lung cancers in men are job-related. The researchers from researchers from IRCCS Ospedale Maggiore Policlinico in Milan found that for men,about 12 per cent had worked in occupations listed as known lung cancer risks,compared to 6 per cent of controls; these occupations included mining,metalworking,and certain types of construction work. Men in the risky occupations were 74 per cent more likely to have been diagnosed with lung cancer. The strongest associations were seen for ceramic and pottery jobs and brick manufacturing,as well as for those working in manufacturing of non-iron metals.

50 AND ABOVE

Drinking may not worsen bipolar symptoms

Among people with bipolar disorder who strictly followed their medication plan,drinking alcohol did not appear to worsen their mood symptoms,suggests a study published in the Journal of Clinical Psychiatry. Bipolar disorder can cause extreme mood swings that require medication to control,and among those with the disease about half abuse alcohol and other drugs. The researchers from University Medical Center,Amsterdam,were surprised to find that the group of heavy drinkers respondents did not have greater numbers of depressed days,number or severity of mood swings,or any other bipolar disorder symptom than the occasional or moderate drinkers. More than 90 per cent of the participants reported taking prescribed bipolar disorder medication as directed.