Why Does Walking Economy Improve after Weight Loss in Obese Adolescents?
Why Does Walking Economy Improve after Weight Loss in Obese Adolescents?
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DOI：
10.1249/mss.0b013e318236edd8
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发表时间：
2012-04-01
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影响因子：
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通讯作者：
Duche, Pascale
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文献类型：
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作者：
Peyrot, Nicolas;Thivel, David;Duche, Pascale
佩罗特，N.，D.蒂韦尔湖ISACCO，J. B。Morin，A.铃！P公爵为什么肥胖青少年减肥后步行经济会改善？医学科学体育锻炼，第44卷，第4期，第100页。659-665，2012。目的：本研究检验了步行经济的增加（即，每公斤净代谢率的降低）是由支持较低体重和在行走过程中保持平衡所需的较低代谢率引起的。方法：16名肥胖的青少年男孩和女孩在减肥计划之前和之后进行了测试。对以四种预设速度（0.75、1、1.25和1.5 ms（-1））和首选速度站立和行走时的身体成分和摄氧量进行量化。净代谢率和总代谢成本的步行与速度的关系进行了测定。使用三室模型区分与站立（室1）、行走期间保持平衡和支撑体重（室2）以及移动质心和肢体所需的肌肉收缩（室3）相关的代谢率的各个部分。结果如下：体重减轻后，每公斤站立代谢率（隔间1）显著增加，而步行过程中每公斤净代谢率平均下降9%。因此，每单位距离步行的总代谢成本与速度的关系，因此首选的步行速度并没有随着体重减轻而改变。体重减轻后，模型的Comb 2显著降低，而隔室3没有变化。结论：该模型表明，肥胖青少年减肥后步行经济性的改善可能与支持较低体重和步行过程中保持平衡所需的等长肌肉收缩的代谢率较低有关。相比之下，与移动质心和肢体所需的肌肉收缩相关的总代谢率的一部分似乎与减肥个体步行经济性的改善无关。
PEYROT, N., D. THIVEL, L. ISACCO, J.-B. MORIN, A. BELL!, and P. DUCHE. Why Does Walking Economy Improve after Weight Loss in Obese Adolescents? Med. Sci. Sports Exerc., Vol. 44, No. 4, pp. 659-665, 2012. Purpose: This study tested the hypothesis that the increase in walking economy (i.e., decrease in net metabolic rate per kilogram) after weight loss in obese adolescents is induced by a lower metabolic rate required to support the lower body weight and maintain balance during walking. Methods: Sixteen obese adolescent boys and girls were tested before and after a weight reduction program. Body composition and oxygen uptake while standing and walking at four preset speeds (0.75, 1, 1.25, and 1.5 ms(-1)) and at the preferred speed were quantified. Net metabolic rate and gross metabolic cost of walking versus-speed relationships were determined. A three-compartment model was used to distinguish the respective parts of the metabolic rate associated with standing (compartment 1), maintaining balance and supporting body weight during walking (compartment 2), and muscle contractions required to move the center of mass and limbs (compartment 3). Results: Standing metabolic rate per kilogram (compartment 1) significantly increased after weight loss, whereas net metabolic rate per kilogram during walking decreased by 9% on average across speeds. Consequently, the gross metabolic cost of walking per unit of distance versus-speed relationship and hence preferred walking speeds did not change with weight loss. Compartment 2 of the model was significantly lower after weight loss, whereas compartment 3 did not change. Conclusions: The model showed that the improvement in walking economy after weight loss in obese adolescents was likely related to the lower metabolic rate of the isometric muscular contractions required to support the lower body weight and maintain balance during walking. Contrastingly, the part of the total metabolic rate associated with muscle contractions required to move the center of mass and limbs did not seem to be related to the improvement in walking economy in weight-reduced individuals.