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A metric mile is a distance which approximates one statute mile (1609.344 m) at a round figure of metres (the SI or metric unit of length). The term is most commonly used in track running and swimming. In track running, the 1500 m race became the standard middle distance race in Europe in the late 19th century, and has been the standard distance in the Olympic Games since 1896. The distance of the race is sometimes referred to as a metric mile.〔(【引用サイトリンク】title=Middle-distance running )〕 Prior to metrication, many tracks in the United States and the Commonwealth of Nations were constructed to the specifications of one quarter of a mile, 440 yards (402.336 m). Thus when the mile was run, the race was a four lap race. The Commonwealth officially converted to metric in the mid-1960s. The United States adopted metric rules in the mid to late 1970s, though some tracks are still constructed to be a quarter of a mile in length requiring calibrated painted lines to run metric races. Even in countries like the U.S. which do not embrace the metric system, most running tracks now have a lap distance of 400 metres in the innermost lane. The final leg of a distance medley relay uses a four lap 1600 m leg; The standard middle distance in many United States high school competitions is 1600 m and this distance is sometimes referred to as a metric mile as well. In swimming, the 1500 m (or 1650 yards) race is commonly referred to as "the swimmer's mile", and is often the longest distance swum by competitors in a pool. The standard distance triathlon also employs the swimmer's mile, except in open water instead of a pool. ==See also== * Metric foot * Metrication * Scandinavian mile 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「Metric mile」の詳細全文を読む スポンサード リンク
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