TOKYO: A double Olympic judo gold medallist was jailed in Japan Friday for raping a student, capping a terrible week for the sport after claims a national coach beat athletes with a bamboo sword.

Masato Uchishiba was sentenced to five years in prison for the assault on a teenage member of a college judo club he was coaching, a court official said, after she drunkenly fell asleep in a Tokyo hotel.

Uchishiba, 34, was feted as a national hero after bringing home a gold medal from the 2004 Athens Olympics, an achievement he repeated at the 2008 Beijing Games.

Prosecutors said the incident occurred in September 2011, when the women's judo club from Kyushu University of Nursing and Social Welfare had been on a visit to Tokyo.

After a night of drinking and karaoke, the teenager, whose exact age was not given but who was believed to have been 18 or 19 at the time, fell asleep in her hotel room and awoke to find Uchishiba raping her.

"When she became aware, she resisted by saying, 'What are you doing? Stop.' But he turned up the volume of the television and covered her mouth with his hand," prosecutors said, according to NHK.

The victim is not being identified publicly because of the nature of the crime.

Married Uchishiba pleaded not guilty and maintained throughout the trial that the sex with the teenage student had been consensual.

Uchishiba on Friday said in court he would appeal the decision.

The verdict comes after a torrid week for judo, in which the coach of the national women's team resigned after admitting claims that he beat his athletes with a bamboo sword were "more or less true".

Ryuji Sonoda, who took the team to the London Olympics, acknowledged allegations of violence against his charges, including face-slapping and verbal abuse.

Sonoda, a 39-year-old former world judo champion, told a tightly-packed press conference: "I would like to deeply apologise for causing trouble to all the athletes and people concerned with what I have done and said."

The media storm that engulfed judo, a popular sport in Japan that is usually a reliable source of Olympic medals, comes as Tokyo launches its international campaign for the right to host the 2020 Games.

The nation's education and sports minister on Thursday ordered swift action to contain a scandal that observers say could badly dent Japan's chances of beating Istanbul and Madrid for the 2020 Olympiad. - AFP

• Please wait.

• Grace hammers home a point with two golds
• Rule makers to ban anchoring of putters from 2016
• McGinley raises Ryder Cup picks from two to three
• Governing bodies to prohibit anchoring of putters from 2016
• China crush arch rivals Indonesia
• China to host seventh edition of Royal Trophy
• Former Asian phenom takes slow route to success
• South Korean captures first US PGA title with a 69
• Spurs thump Grizzlies in series opener
• Uihlein rules at Madeira Open