 In International elite competition , electronically tethered starting blocks sense the reaction time of the athletes . If the athlete reacts in less than 0 @.@ 1 second , an alert sounds for a recall starter and the offending athlete is guilty of a false start . 
 In International elite competition , electronically tethered starting blocks sense the reaction time of the athletes . If the athlete <a href='uninflect' title='1'><mark>reacts</mark></a> in less than 0 @.@ 1 second , an alert <a href='uninflect' title='2'><mark>sounds</mark></a> for a recall starter and the offending athlete <a href='drop_aux' title='3'><mark>is</mark></a>guilty of a false start . 
In International elite competition , electronically tethered starting blocks sense the reaction time of da athletes . If tdaathlete react in less than 0 @.@ 1 second , an alert sound fa a recall starter and the offending athlete guilty of a false start .