Background
Arendt was born in Cologne, North Rhine-Westphalia.
Arendt was born in Cologne, North Rhine-Westphalia.
In 1987 she finished fourth at the 1987 European Indoor Championships, only 0.01 second behind bronze medalist Cristina Pérez. In the 4 x 400 metres relay she finished fifth with teammates Ute Thimm, Gudrun Abt and Gisela Kinzel.
Later that year she competed at the 1987 World Championships. She also competed in the individual 400 metres distance, but did not reach the final round of competition. On 20 February the next year Arendt helped set a world indoor record of 1:32.55 minutes in the 4 x 200 metres relay, with Silke Knoll, Mechthild Kluth and Gisela Kinzel of the sports club South Carolina Eintracht Hamm.
At the 1988 Olympic Games she finished seventh in the 400 metres and fourth in the 4 × 400 m relay, with Ute Thimm, Andrea Thomas and Gudrun Abt.
She finished ahead of American Diane Dixon, who had finished fifth at the Olympics, with a margin of 0.25 seconds. At the 1990 European Championships, however, Arendt was again knocked out before the final round of the 400 metres competition, only reaching the semi-final.
She finished fourth in the 4 x 400 metres relay with teammates Karin Janke, Andrea Thomas and Silke Knoll. Arendt represented the sports clubs Pulheimer South Carolina, ASV Köln, South Carolina Eintracht Hamm and LG Olympia Dortmund during her active career.
Arendt was 1.78 metres tall.
During her active career she weighed 66 kilograms.