Volpe Ayub Beatriz, Bar-Or Oded
Childrens' Exercise and Nutrition Centre, McMaster University, Hamilton, Ontario, Canada.
Med Sci Sports Exerc. 2003 Apr;35(4):669-74. doi: 10.1249/01.MSS.0000058355.45172.DE.
To compare the energy cost of treadmill walking, in pairs of obese and lean adolescents who were matched for total body mass.
Metabolic energy expenditure was determined at 67, 83, and 100 m.min-1, in nine obese and nine nonobese 11- to 18-yr-old boys. Total adiposity and fat distribution in the trunk and limbs were assessed using DXA.
There were no intergroup differences in the net (exercise minus rest) energy cost at the two lower speeds, but the obese boys expended more energy at 100 m.min-1 (12%, P < 0.05). Heart rate was consistently higher in the obese boys: 18% at 67 m.min-1, 22% at 83 m.min-1, and 28% at 100 m.min-1. Pooling all subjects together, body mass, rather than adiposity, was the main predictor of energy cost: 89.1%, 76.3%, and 62.1% (P < 0.05 for all) of the total variance at 67, 83, and 100 m.min-1, respectively. The variance explained by total body fat was only 2.1%, 8.4%, and 16%, respectively. There was no relationship between [OV0312]O(2net) and the proportion of fat in body segments.
It is total body mass, more than adiposity (total and regional) per se, that affects the energy cost of locomotion in obese boys.
比较体重匹配的肥胖和消瘦青少年在跑步机上行走的能量消耗。
对9名肥胖和9名非肥胖的11至18岁男孩，在速度为67、83和100米·分钟⁻¹时测定代谢能量消耗。使用双能X线吸收法评估全身脂肪含量以及躯干和四肢的脂肪分布。
在较低的两种速度下，两组之间的净（运动减去休息）能量消耗没有差异，但肥胖男孩在100米·分钟⁻¹时消耗更多能量（多12%，P<0.05）。肥胖男孩的心率始终较高：在67米·分钟⁻¹时高18%，在83米·分钟⁻¹时高22%，在100米·分钟⁻¹时高28%。将所有受试者合并在一起分析，体重而非脂肪含量是能量消耗的主要预测因素：在67、83和100米·分钟⁻¹时，分别占总方差的89.1%、76.3%和62.1%（均P<0.05）。全身脂肪解释的方差分别仅为2.1%、8.4%和16%。净耗氧量与身体各部位脂肪比例之间没有关系。
影响肥胖男孩运动能量消耗的是总体重，而非肥胖本身（全身和局部）。
