Hormones in sport

摘要

Female athletes may not be eligible to compete as women if blood tests show they have natural testosterone levels in the male range, according to rules accepted by the International Association of Athletics Federations on 12 April. The decision on hyperandrogenism - in which the body produces higher than normal levels of androgen hormones, particularly testosterone - has been broadly welcomed by experts. See go.nature.com/ xc5cnm for more.