Influence of body size on oxygen consumption during bicycling |
| |
Authors: | Swain, D. P. Coast, J. R. Clifford, P. S. Milliken, M. C. Stray-Gundersen, J. |
| |
Abstract: | Energy in bicycling is primarily expended to overcome air resistance, which is proportional to a cyclist's surface area (SA). Thus we hypothesized that large cyclists should have a lower O2 consumption normalized to body weight (VO2/BW) than small cyclists because of the former's lower SA/BW. We measured the VO2/BW of small (BW = 59.4 +/- 4.1 kg) and large (BW = 84.4 +/- 3.2 kg) cyclists while they bicycled on a flat road at 10, 15, and 20 mph. The large cyclists had a 22% lower VO2/BW than the small cyclists at all speeds. However, the SA/BW ratio of the large cyclists was only 11% lower than that of the small cyclists. We then photographically determined the frontal area (FA) of the cyclists in a racing posture, and found that the large cyclists had a 16% lower FA/BW ratio than the small cyclists. We conclude that large cyclists are at a distinct advantage, in terms of VO2/BW, while bicycling on level roads, and this advantage is principally due to their lower FA/BW ratio. |
| |
Keywords: | |
|
| 点击此处可从《Journal of applied physiology》浏览原始摘要信息 |
|
点击此处可从《Journal of applied physiology》下载全文 |
|