Wasil, who suffered bilateral hip injuries when working as a combat medic in Iraq during 2010, was named in a 29-strong team earlier this week as the US build towards the Rio 2016 Paralympics.

The 23-year-old touched home in a time of 41.21sec at the US Olympic Training Centre in Colorado Springs, to set a new mark for the distance, although it does not feature on the Paralympic programme.

“I was in with a lot of very fast girls who I compete with a lot,” said Wasil.

“They aren’t in my classification so I don’t always get to race them and that’s really enjoyable because it gives me people to pace off.

“I felt like I was going fast and I realised off the start I was keeping up with Colleen Young.”

In addition to her world record, Wasil also set a Pan American record for the 200m breaststroke by clocking 3min 17.89sec at the annual Classic.

The event, now in its seventh year, is aimed at honouring former US Paralympics swimming coach Jimi Flowers, with proceeds being put towards a scholarship fund for his children.

Tucker Dupree, who was selected in the US Paralympics men’s team, was another swimmer who produced impressive performances throughout the two-days of competition.

The three-time Paralympic medallist lowered his American record in the SB12 50m breaststroke by clocking the distance in 34.54sec.

Meanwhile, Garner Moss produced a national record time of 2:45.81 in the men’s S14 200m backstroke, before winning gold in the 50m event in 34.54.