LONDON—The Court of Arbitration for Sport has rejected the Swedish Olympic team's appeal for the women's triathlon to be declared a dead heat and silver medalist Lisa Norden upgraded to gold.

CAS says the photo finish ruling was a "field of play" decision by International Triathlon Union race officials and cannot be challenged.

The court says such decisions are "unable to be reviewed by CAS panels" unless they were made in bad faith.

The ITU studied the photo finish before declaring Nicola Spirig of Switzerland had broken the tape first.

Spirig and Norden finished side by side and were given the same time at the end of a 1,500-meter swim, a 43-kilometer bike ride and a 10-kilometer run in Hyde Park last Saturday.