In this file photo dated June 22, 2022, Summer McIntosh of Canada looks back after winning the women's 200m Butterfly final at the 19th FINA World Championships in Budapest, Hungary. (PHOTO / AP)

Teenager Summer McIntosh set a world record in the 400m individual medley at the Canadian swimming trials on Saturday, four days after she achieved the same feat in the 400m freestyle.

McIntosh finished the 400m individual medley in a time of 4:25.87, surpassing the previous record of 4:26.36 set by Katinka Hosszu at the Rio Olympics in 2016.

"That's the first time I really, vividly heard the crowd during my race," the 16-year-old said.

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"It's amazing to have all my family and friends in the stands, cheering me on. It really helped me in the last 100 meters."

McIntosh set a world record in the 400m freestyle on the opening night of the trials on Tuesday, shaving 0.32 seconds off the mark set by Australia's Ariarne Titmus last year.

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She has one race left, the 200m freestyle, in which she holds a best time of 1:54.13 from earlier this year.