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Birkebeinerrennet (lit. The Birkebeiner race) is a long-distance cross-country ski marathon held annually in Norway. It debuted in 1932 and has been a part of Worldloppet as long as Worldloppet has been around.〔(【引用サイトリンク】title=Birkebeinerrennet )〕 The Birkebeinerrennet is one of three races held under the Birkebeiner moniker, the other two being Birkebeinerrittet (bicycling) and Birkebeinerløpet (cross-country running). Researchers at the Manchester Metropolitan University found that the metabolic cost for modern ski models is about 2.5 J/kg *m as compared to about 5 J/kg *m for ski models dated 542 AD. They also estimated maximum cross country speed for the 542 AD ski to 5 m/s, compared to about 12 m/s for modern cross country skis; for long distance skiing (several hours) results were 3 and 7 m/s respectively. This corresponds to about 5 hours for the original 1206 AD Birkebeiner flight.〔Formenti, Federico et al. (2005): (Human locomotion on snow: Determinants of economy and speed of skiing across the ages ), ''Proceedings of the Royal Society B'', vol. 272 no. 1572, 1561-1569 .〕 ==Race== The race starts at Rena and ends at Lillehammer, a distance of 54 km. The number of participants has been steadily increasing each year, and for the 2011 race, the limit was set at 16,000.〔http://www.fiscrosscountry.com/news/birkebeinerrennet-sold-out-18-minutes,1498.html〕 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「Birkebeinerrennet」の詳細全文を読む スポンサード リンク
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