Florence Kiplagat dropped to the ground while giving the crowd a thumbs up after crossing the finish line at the Chicago Marathon Sunday.
Kiplagat, of Kenya, won the women's race, finishing with an unofficial time of 2:23:33.
"The course for me was very nice," she said. "It was a flat course, sometimes it's windy, but that is part of competition."
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Kiplagat, the top woman in the Chicago Marathon elite field this year, holds the world record for the half marathon and returned to compete in Chicago after a third place finish in 2014. Kiplagat was awarded second place that year after Rita Jeptoo was stripped of her marathon title because of doping.
Her personal best marathon time, 2:19:44, dates from the 2011 Berlin Marathon.
American Deena Kastor, who won the Chicago Marathon 10 years ago, earned an American women's master's record with an unofficial time of 2:27:47.