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4x100-meter relay : ウィキペディア英語版
4 × 100 metres relay

The 4 × 100 metres relay or sprint relay is an athletics track event run in lanes over one lap of the track with four runners completing 100 metres each. The first runners must begin in the same stagger as for the individual 400 m race. A relay baton is carried by each runner and must be passed within a 20 m changeover box (usually marked by yellow lines) which extends 10 m on either side of each 100 m mark of the race. Another line is marked 10 m further back, marking the earliest point at which the outgoing runner may begin (giving up to 10 m of acceleration before entering the passing zone).
Transferring of the baton in this race is typically blind. The outgoing runner reaches a straight arm backwards when they enter the changeover box, or when the incoming runner makes a verbal signal. The outgoing runner does not look backwards, and it is the responsibility of the incoming runner to thrust the baton into the outstretched hand, and not let go until the outgoing runner takes hold of it. Runners on the first and third legs typically run on the inside of the lane with the baton in their right hand, while runners on the second and fourth legs take the baton in their left. Polished handovers can compensate for a lack of basic speed to some extent, and disqualification for dropping the baton or failing to transfer it within the box is common, even at the highest level.
The United States has historically dominated this event in the men's, having won 15 Olympic gold medals and 7 IAAF world championships. Carl Lewis ran the anchor leg on five U.S relay teams that broke the World Record from 1983–92, the first team to break 38 seconds.
The current men's world record stands at 36.84 as set by the Jamaican team at the 2012 London Olympic games on 11 August 2012. So far, the only team to break 37 seconds. The previous record was 37.04 seconds as set by the Jamaican team at the 2011 World Championships. The fastest electronically timed anchor leg run is 8.65 seconds by Usain Bolt in the 2015 IAAF World Relays.〔http://usainbolt.com/2015/05/usain-clocks-fastest-ever-relay-split-of-8-65-secs/ Usain Clocks Fastest Ever Relay Split of 8.65 Secs〕 Bob Hayes was hand-timed as running between 8.5 and 8.9 seconds on a cinder track at the 1964 Tokyo Games.〔http://sports.espn.go.com/oly/summer08/fanguide/athlete?athlete=5325〕
In the women's event, the United States was considered by many to be a strong team after years of East German domination, but failed to make it to the finals in the 2008 Olympic Summer Games. Carmelita Jeter ran an anchor leg of 9.70 seconds, the fastest ever in London Olympics 2012.〔http://www.alltime-athletics.com/w4x100ok.htm〕
The women's world record stands at 40.82 seconds, set by the United States of America in 2012 at the London Olympics.
==Olympic Games medalists==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「4 × 100 metres relay」の詳細全文を読む



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