Four to seven more doping cases possible before Tour start

It's all about blood. Increasing the ability of the blood to deliver oxygen to the muscles is a potent performance-enhancer. Athletes are prepared to go to tremendous lengths to beat the tests.

It's all about blood. Increasing the ability of the blood to deliver oxygen to the muscles is a potent performance-enhancer. Athletes are prepared to go to tremendous lengths to beat the tests.

There could be four to seven more doping cases announced before the start of the Tour de France Saturday, the French sports publication L'Equipe reported on Thursday. Those cases will not be biological passport cases but stem from positive controls at this year's Tour de Romandie and the Tour de Suisse, according to the French newspaper, which is owned by the Tour organiser ASO.

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