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wind assistance
In track and field, wind assistance is the benefit that an athlete receives during a race or event as registered by a wind gauge. Wind is one of many forms of weather which can affect sport.
Due to a tailwind helping to enhance the speed of the athlete in events like certain sprint races (100 and 200 metres), 100/110 metres hurdles, the triple jump and the long jump, there is a limit to how much assisting wind the athlete may perform under if the performance is to establish a record. If a tail wind exceeds the result cannot be registered as a record on any level.〔(Motivate : Mathematics Videoconferences for Schools )〕 However, the results within that competition still are valid because all athletes in a race would get equal assistance, and in field events it is just the luck of the circumstance at the moment of the attempt. The wind assistance maximums are only in regard to the validation of a record.
The exceptions are the combined events like heptathlon and decathlon. Here, the total score may be accepted even though some of the results had a tail wind of more than 2.0 m/s. The maximum limit is 4.0 m/s for any one event, but 2.0 m/s on average across all applicable disciplines.
There have also been cases where the prevailing wind has aided point to point long distance races like the 2011 Boston Marathon, however the nature of point to point courses invalidate allowable records by design.
==Notable cases of strong wind assistance==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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