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The combined weight of the cyclist and equipment impact the energy requirements of a ride. This relationship is directly proportional i.e. a doubling of the weight on the bike doubles the number of Calories expended. And 2 pounds on a cyclist is just as much a problem as 2 pounds of equipment on the bike frame itself. Austin did a nice analysis on the effect of weight on performance. Here's his conclusion: I thought it would be interesting to see how weight would influence these curves. If I lost 10 lbs (about 5%), I would be able to go about 5% faster on the steepest hills, 0.4% faster on the level, and about 2% slower on the downhills. Over a simulated 20-mile closed-circuit ride with a variety of grades, a 10-lb difference produced a 33 second difference. This may or may not seem significant in the context of a time trial. On the other hand, there are two hills on this simulated route where the heavier rider falls back 14 seconds. That is, about 200 feet back and well-dropped. A two-lb difference that you can buy at a bike shop for $500 amounts to only 7 seconds on this circuit, but again, this could mean cresting a hill 50 feet behind your better-sponsored buddies.
大致是说： 骑行中，重量和能量消耗是成正比的。 车子重两斤和多了两斤肉要求多消耗的能量是一样的。 经过研究表明， 如果一个人减去10磅（4.5kg， 大概相当于体重的5%）， 在爬陡坡的时候，可以快大概5% （因为陡坡中基本所有的能量都是用于提高势能，车子内摩擦损耗，轮-地阻力等所占比例很小）。 平路上大概只能快0.4%， 下坡的时候要慢大概2%.
模拟一个20英里(大概32公里)的封闭路 （意味着上坡=下坡， 最后一圈下来高度没有变化），该封闭路有各种等级的坡。 10磅(4.5kg)的差异最终会导致33秒的差异。 同时，在这段模拟中有两个爬坡， 体重大的回落后14秒 （大概相当于落后67米）。 2磅(0.9kg）的差异这样一圈下来只有7秒的差异。
有些东西很有意思：
1。 爬坡的时候，重量越轻越好，所以要减轻车的重量， 平路的时候基本没有影响， 所以不惜增加一点重量，改善空气动力方面。 体重大了，下坡有优势。
2。 4.5kg的差异其实32公里（大概1小时）只差33秒。 虽然我原来觉得重量不那么重要，但这点还是超乎我的想象。
3。 文中提到两个爬坡可以导致14秒的差异。 可是不知道这两个坡多长。 |
发表于 2007-5-21 10:43:34
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发表于 2007-12-21 00:23:21
