Department of Medical and Biological Sciences, University of Udine, Piazzale Kolbe 4, Udine, Italy.
Eur J Appl Physiol. 2012 Dec;112(12):4027-33. doi: 10.1007/s00421-012-2389-6. Epub 2012 Mar 29.
We investigated the relationship between mechanical and energy cost of transport and body mass in running humans. Ten severely obese (body mass ranging from 108.5 to 172.0 kg) and 15 normal-weighted (52.0-89.0 kg) boys and men, aged 16.0-45.8 years, participated in this study. The rate of O(2) consumption was measured and the subjects were filmed with four cameras for kinematic analysis, while running on a treadmill at 8 km h(-1). Mass specific energy cost (C (r)) and external mechanical work (W (ext)) per unit distance were calculated and expressed in joules per kilogram per meter, efficiency (η) was then calculated as W (ext) × C (r) (-1) × 100. Both mass-specific C (r) and W (ext) were found to be independent of body mass (M) (C (r) = 0.002 M + 3.729, n = 25, R (2) = 0.05; W (ext) = -0.001 M + 1.963, n = 25, R (2) = 0.01). It necessarily follows that the efficiency is also independent of M (η = -0.062 M + 53.3298, n = 25, R (2) = 0.05). The results strongly suggest that the elastic tissues of obese subjects can adapt (e.g., thickening) to the increased mass of the body thus maintaining their ability to store elastic energy, at least at 8 km h(-1) speed, at the same level as the normal-weighted subjects.
我们研究了在人类跑步中机械和能量传输成本与体重之间的关系。10 名严重肥胖（体重范围为 108.5 至 172.0 公斤）和 15 名正常体重（52.0 至 89.0 公斤）的男孩和男性，年龄在 16.0 至 45.8 岁之间，参加了这项研究。我们测量了氧气消耗率，并使用四台摄像机对运动员进行拍摄，以便进行运动学分析，同时让他们在跑步机上以 8 公里/小时的速度跑步。我们计算了单位距离的质量特异性能量成本（C(r)）和外部机械功（W(ext)），并以焦耳/千克/米表示，然后计算效率（η）为 W(ext)×C(r)(-1)×100。发现质量特异性 C(r)和 W(ext)都与体重（M）无关（C(r)=0.002M+3.729，n=25，R(2)=0.05；W(ext)=-0.001M+1.963，n=25，R(2)=0.01）。因此，效率也与 M 无关（η=-0.062M+53.3298，n=25，R(2)=0.05）。结果强烈表明，肥胖受试者的弹性组织可以适应（例如，增厚）体重的增加，从而保持其在至少 8 公里/小时的速度下储存弹性能量的能力，与正常体重受试者相同。
