In 1967, a Boston Marathon official nearly dragged a woman off the course after she managed to enter the then-men's-only race. Five decades later, race officials aren't as concerned about gender boundaries: They're now publicly acknowledging that transgender runners can compete according to their own self-identification.

"We take people at their word. We register people as they specify themselves to be," said Tom Grilk, chief of the Boston Athletic Association, the group behind the race. "Members of the LGBT community have had a lot to deal with over the years, and we'd rather not add to that burden."

At least five openly transgender women are signed up to run the storied 26.2-mile race through Boston and its suburbs April 16. And while they aren't the first, their presence helped bring clarity to the race's stance on transgender runners.

Stevie Romer, a transgender woman from Woodstock, Ill., says she registered for Boston as a woman because that's who she is. Ms. Romer legally changed her gender, grew her hair out, and started living openly as a woman more than a year ago.

"To be able to experience it as me was really, really important," she said. "I've been a runner since as long as I can remember. I love running, but I just happen to be transgender."

In the past, it was uncertain how transgender runners would be treated. Some simply signed up and ran, while some were too afraid to try, said Amelia Gapin, a transgender woman from Jersey City, N.J., who is registered for this year's race.

"It's kind of murky how people handle it," said Ms. Gapin, who also leads a social media group for transgender runners. "We are such a small percentage of the population that we generally just fly under the radar."

The issue drew attention in March after a blogger wrote about three openly transgender women signed up for Boston.

Mr. Grilk said there wasn't much debate – runners should identify the same way for qualification and competition, he said, but otherwise they won't be challenged.

That flexibility contrasts with the 1967 case of Kathrine Switzer, who escaped the grasp of a marathon official who found out she entered the race using her initials, K.V. Switzer. While the same official also went after male rule-breakers, it still became known as a landmark moment in the fight to include women in sports.

Questions about how to define and verify gender have rankled officials at the highest level of sport for decades. But at the amateur level, the topic has surfaced more recently as a growing number of transgender athletes look to compete without masking their identities.

Several other major marathons said they have no official policies but are taking a similar approach to Boston. Organizers of the Chicago, New York City, London, and Los Angeles marathons all said they honor the gender that runners submit during sign-ups.

"We want to be inclusive and sensitive to all of our participants," said Carey Pinkowski, Chicago Marathon executive race director. "At this point, we don't feel that we need to require legal or medical records or anything along those lines."

But there's still a wrinkle: Many races, including Boston, New York, and Chicago, require runners to show IDs with the same names and genders as their application forms, which can be an obstacle for transgender athletes who haven't legally changed their personal information. Race officials said they haven't fielded complaints but will monitor their policies to make sure they're inclusive.

In elite competition, debate has mostly focused on transgender women. Olympic officials issued new rules in 2016 saying transgender women can compete if their testosterone levels stay beneath a certain limit, and many professional races now follow similar rules.

Although the stakes are lower for Boston's amateur runners, it can still be a complicated issue. Boston is among few marathons where even nonprofessional runners have to meet strict qualifying times based on age and gender, and some runners spend years trying to qualify.

In response to the March blog post, some commenters said transgender women have an unfair physical advantage and shouldn't bump other women from qualifying.

For transgender women who do lower their testosterone levels, medical experts say there's no evidence of an athletic advantage.

"That's a misconception and a myth," said Dr. Alex Keuroghlian, director of education and training programs at the Fenway Institute, a health and advocacy center for the Boston LGBT community. "There's no physiologic advantage to being assigned male at birth."

Rather, transgender women who take medication to lower their testosterone levels often face side effects like dehydration, sluggishness, and reduced stamina – which can all spell disaster for marathon training.

Gapin, the runner from New Jersey, said she had to overcome major setbacks during her transition. While taking testosterone blockers, her pace dropped by more than a minute per mile. Later she underwent surgery and had to take months away from training to recover.

All told, it took Gapin three years running as an openly transgender woman before she qualified for Boston, a goal she set seven years ago. And although she knows some might not like it, she plans to run the race this month – and enjoy it.

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"I just want to race for fun and take it all in," she said. "Actually running it is sort of a victory lap for what I've accomplished."

This article was reported by The Associated Press.