Aug 13 (Reuters) - Canadian ⁠Summer McIntosh won the women's 400 ⁠metres individual medley at the Pan Pacific ‌Championships on Thursday in a championship record four minutes, 28.01 seconds, rebounding from a disappointing start to the ​meet a day earlier.

The three-times ⁠Olympic gold medallist, who ⁠finished a surprise second in Wednesday's 200 freestyle ⁠final, ‌topped the podium ahead of Australian Jenna Forrester (4:31.50) and Argentina's Agostina Hein(4:32.54) ⁠in Irvine, California.

Her winning time was ​almost four ‌seconds faster than American Elizabeth Beisel's previous ⁠championship record ​of 4:31.99 set in 2014.

"Tonight I really wanted to attack the race coming off yesterday," ⁠McIntosh said. "You kind of have to ​just forget about it and really just focus on the next day."

McIntosh, who set a ⁠world record of 4:23.65 in the event in June last year, had built an unassailable lead going into the final leg as Forrester ​held off the rest ⁠of the field to take silver.

Her next event ​is the 400 freestyle ‌on Friday with the 200 ​IM on Saturday.

(Reporting by Amy Tennery in New York; Editing by Peter Rutherford)