Erika Erndl and Adam Mania
Courtesy of: Swimming World
Editor's note: This article has been updated from its original posting. See below for the update.

INDIANAPOLIS, Indiana, July 1. IN the midst of U.S. Open and American records broken by the top swimmers at the USA Swimming nationals and world championship trials, four Masters swimmers set U.S. long course national records in impressive performances.

Erika Erndl, 35, of T2 Aquatics, broke four national records in the 35-39 age group during the week, two of which had stood since the last millennium. She started the competition with a 55.17 in the prelims of the 100 freestyle, breaking the 18-year-old national mark of 58.87 swum by Olympian Sandy Neilson-Bell in 1995. (Erndl placed 14th in finals with a 55.43.)

In the 200 free, Erndl put up a 2:00.04 in the finals for 12th place, beating the 2:03.37 Dawn Heckman posted last summer. Another longstanding record fell in the 100 fly, as Erndl cracked the 1:00 barrier with a 59.52 to place seventh in the event at nationals. Her time erased Tracie Moll's 1:03.79 that had stood since 1999.

Erndl's meet wrapped up with the 50 free, swimming a 25.52 in prelims to wipe out Dara Torres' national record of 25.98 swum during Torres' comeback campaign in 2006.

All four of Erndl's times would have also broken Masters world records, but since the USA nationals was not a sanctioned Masters meet, Erndl will have to be satisfied with just four new national records. U.S. Masters swimming allows national records to be set in non-Masters meets.

Update: Erndl's teammate at T2 Aquatics, Justine Mueller, broke three national records. The 26-year-old swam a 2:29.80 in the 200 breast B final, shattering Megan Jendrick's national mark of 2:34.09 in the 25-29 age group on her way to an 11th-place finish. And in the 100 fly, she cracked the 1:00 barrier with a 59.99 in the B final, placing 12th. She wrapped up her meet with a blistering 2:14.03, good enough for sixth place and a new national record. The previous record belonged to 1996 Olympian Allison Wagner with a 2:21.98.

Mueller dipped under the Jendrick's national record in the 100 breast, swimming a 1:09.10 in the 100 breast preliminaries. But Jendrick, 26, was faster in the finals that evening, winning the B final with a 1:08.80 to lower her record of 1:09.81.

Adam Mania, 29, of Schroeder YMCA and a Polish Olympian in 2004, broke his own national record in the 50 backstroke in the 25-29 age group in Indianapolis. He posted a 25.13 in prelims to shatter his own mark of 26.05 from 2011. He placed seventh in the final with a 25.14. He just missed his national record of 55.15 in the 100 backstroke, swimming a 55.30 in prelims and 55.96 in finals.

Like Erndl, the times by Mueller, Jendrick and Mania will not count for Masters world records because they were not swum in sanctioned Masters competitions.

Though just about every winner at the USA Swimming nationals is of age to break Masters national records, only registered Masters swimmers are eligible to set records.