Are Brits and Americans at a disadvantage ?

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from cnnsi 9/16/11: Usain Bolt ran the season's fastest time of 9.76 seconds in the 100 meters in Belgium on Friday and was still upstaged by Jamaican training partner Yohan Blake, who powered his way to the second fastest 200m in history.

Blake blasted for the line in 19.26 seconds, just 0.07 seconds off Bolt's world record.

"I knew I could do something crazy - 19.2? I was a bit surprised," Blake said.
With 19.26, he improved on his personal best by 0.52 seconds.

That's a sudden improvement of 2.7%. Knowing how world-class athletes train for years to shave their times a by tenth of a second (while improving fractions of a percent), this is pretty unbelievable for the Jamaican athlete to improve so much, so quickly.

article here: http://sportsillustrated.cnn.com/2011/more/09/16/Usain-Bolt-fastest-100m.ap/index.html#ixzz1Y9l1z3FT
 
Same day, the fastest 10km from a white male also.

"Galen Rupp was third, setting an American record in 26:48. He broke the previous record by a full 11 seconds, set by Chris Solinsky in April 2010."

Should we worry about the state of testing at this event?

It's well known within the running community that some events promote themselves as "no testing", to attract stars.
Blake also had a terrribly slow start. Any decent start would have gotten him a world record.

Some people can't deal with the responsibility of the rainbox jersey. Blake ain't got that, but he does seem to deal with the pressure and expectation well. The improvement is just oddly big. Did he underperform before? That's always possble. And his coach is going to be great at seeing potential in runners that have not shown all of it yet.