Summer McIntosh continued her sensational form by breaking her own world record in the 400m individual medley at the Canadian Swimming Trials in Victoria on Wednesday. The 18-year-old swimming sensation clocked 4:23.65, surpassing her previous mark of 4:24.38 set in Toronto during last year’s Olympic trials.A three-time Olympic gold medallist, McIntosh delivered a dominant performance just weeks ahead of the World Championships in Singapore. “Going into tonight, I knew I could do something really special because this has probably been the best meet of my career,” McIntosh said in a poolside interview. World records are made to be broken. So by the time I leave this sport, I want to make sure that that record is as fast as possible. That really keeps me going, because I know there's always going to be the next generation of kids growing up, and they're going to be chasing the record. So I've gotta give them my best effort to see how long it can stand, McIntosh added.McIntosh, who claimed gold medals in the 200m butterfly, 200m individual medley, and 400m individual medley at last year’s Paris Olympics, now sets her sights on next month’s World Championships in Singapore. With four world championship golds already to her name, the Canadian star will be looking to continue her dominance on the global stage.