Career
After missing the 2004 Summer Olympics he retired in the spring of 2005.
After missing the 2004 Summer Olympics he retired in the spring of 2005.
Aartsen first gained attention in 1992, when he won the title in the 200 m freestyle at the European Junior Championships in Leeds. A year later he won the golden medal in the 4×100 m medley relay at the European LC Championships 1999 in Istanbul, Turkey, alongside Klaas-Erik Zwering, Marcel Wouda and Pieter van den Hoogenband.
In 1998 he was a member of the Dutch winning relay team (4×50 m freestyle) at the European Short Course Swimming Championships 1998 in Sheffield.