LAUSANNE, Switzerland — Sport's highest court extended doping bans until April 2011 for seven Russian athletes who tampered with urine samples, ensuring they will miss next month's world championships in Berlin.

The Court of Arbitration for Sport upheld the IAAF's appeal for longer suspensions for middle-distance runners Olga Yegorova, Tatyana Tomashova, Yelena Soboleva, Yulia Fomenko and Svetlana Cherkasova, plus field athletes Gulfiya Khanafeyeva and Darya Pishchalnikova.

The seven athletes allegedly used other people's clean urine to pass doping tests.

The International Association of Athletics Federations provisionally suspended the women last July — days before the Beijing Olympics — following an undercover investigation.

Russia's athletics federation angered the world governing body by applying standard 2-year bans backdated to start in spring 2007, when the samples were given. That would have cleared the women to return at the world champions beginning Aug. 15.

The court's ruling applies bans that run through April 20, 2011.

"It was unacceptable to the IAAF that these athletes who had committed serious and deliberate breaches of our anti-doping rules would receive an effective ban of approximately 9-10 months," the governing body said in a statement Wednesday.

Yegorova, now 37, won the 2001 world championship in the 5,000 meters, weeks after she had tested positive for the banned blood-booster EPO. She escaped a ban and was allowed to run because of mistakes made during the testing process.

The 34-year-old Tomashova won 1,500-meter gold at the 2003 and 2005 world championships. She is the current European champion.

The 26-year-old Soboleva won the 1,500-meter world indoor title in 2008, breaking her own world record set the previous month.

Fomenko won the 1,500 at the world indoors in 2006, and won silver behind Soboleva last year. The 29-year-old Fomenko finished second at the 2005 worlds but was disqualified for obstructing another runner.

Cherkasova, now 31, was sixth in the 800 meters at the 2007 worlds; the 27-year-old Khanafeyeva held the world record in hammer for 12 days in June 2006; and discus thrower Pishchalnikova, 24, is the reigning European champion.