The footballer Megan Rapinoe has become the highest profile sportswoman to publicly support transgender athletes competing in women's competition, arguing that the debate is about something much bigger than sport.
Rapinoe, who is a World Cup winner and Olympic champion with the United States, also suggested that there was minimal evidence to show that transgender women had distorted elite competition since they were included in most women's sports, subject to suppressed testosterone levels.
"I'm 100 per cent supportive of trans inclusion," Rapinoe told Time magazine. "We're missing almost everything. At the highest level, there is regulation. In collegiate sports, there is regulation. And at the Olympic and professional level. It's not like it's a free-for-all where everyone's just doing whatever.
"I think people also need to understand that sports is not the most important thing in life, right? Life is the most important thing in life. And so much of this trans inclusion argument has been put through the extremely tiny lens of elite sports. We're talking about kids. We're talking about people's lives."
Fina, world swimming's governing body, ruled over the weekened that transgender athletes who had reached male puberty could no longer compete in elite women's sport. It had previously been possible provided that they had suppressed their testosterone to below 5nmol/L for a continuous year. Under those rules, the American swimmer Lia Thomas became the first openly transgender athlete to win an NCAA Division I national championship after winning the women's 500-yard freestyle event in March.