A SERIES of successes by recent mothers has prompted questions whether childbirth, far from spelling the end of a sporting career, can actually boost an athlete’s performance.

AFTER suffering a viral tummy bug and spending much of the week in isolation from the other members of the Irish team, David Campbell, last night ran the second fastest time of his career at the world championships in Osaka.

Tyson Gay became the third man in history to complete a World Championship sprint double after winning the 200 metres in Osaka on Thursday night.