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10-second barrier : ウィキペディア英語版 | 10-second barrier
The 10-second barrier is a term used in track and field athletics, which refers to the physical and psychological barrier of completing the men's 100 metres sprint in under ten seconds. The achievement was traditionally regarded as the hallmark of a world-class sprinter. Its significance has become less important since the late 1990s, as an increasing number of runners have surpassed the ten seconds mark.〔Gardener, Jason. (2008-08-09). (Jason Gardener: I'm backing Tyson Gay to win one of the greatest 100 metres finals ). ''The Daily Telegraph''. Retrieved on 2009-06-03.〕 ==History==
For sprints, the International Association of Athletics Federations (IAAF) rules for world records and other recognised performances require: a wind assistance of not more than two metres per second in the direction of travel; fully automatic timing (FAT) to one hundredth of a second; and no use of performance-enhancing substances. Wind gauge malfunctions or infractions may also cause a sprinter's run to be invalid.
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