This week

Hundreds of lives could be saved if heart ops took place later in the day, a French study says. Patients were twice as likely to have a heart attack or failure after morning surgery. Lille University experts believe genes that help healing are more active later in the day. Women who give birth in winter and spring are less likely to suffer ‘baby blues’, a study has found. Researchers at Brigham and Women’s Hospital in Boston believe friends and family are more likely to rally round in cold weather. TVS in gyms increase a runner’s risk of injury as they change their running style to watch the screens, a Nottingham Trent study has shown.