Obesity does not increase external mechanical work per kilogram body mass during walking

被引:41
作者
Browning, Raymond C. [1 ]
McGowan, Craig P. [2 ]
Kram, Rodger [3 ]
机构
[1] Colorado State Univ, Dept Hlth & Exercise Sci, Ft Collins, CO 80523 USA
[2] Univ Texas Austin, Dept Mech Engn, Austin, TX 77812 USA
[3] Univ Colorado, Dept Integrat Physiol, Boulder, CO 80309 USA
关键词
Biomechanics; Obesity; Metabolic cost; Physical activity; GROUND REACTION FORCES; UNITED-STATES; GAIT; TREADMILL; MUSCLE; COST; LOCOMOTION; EFFICIENCY; EXCHANGE; WEIGHT;
D O I
10.1016/j.jbiomech.2009.06.046
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Walking is the most common type of physical activity prescribed for the treatment of obesity The net metabolic rate during level walking (W/kg) is similar to 10% greater in obese vs. normal weight adults. External mechanical work (W-ext ) is one of the primary determinants of the metabolic cost of walking, but the effects of obesity on W-ext have not been clearly established. The purpose of this study was to compare W-ext between obese and normal weight adults across a range of walking speeds We hypothesized that W-ext, (J/step) would be greater in obese adults but W-ext normalized to body mass would be similar in obese and normal weight adults We collected right leg three-dimensional ground reaction forces (GRF) while twenty adults (10 obese, BMI = 35.6 kg/m(2) and 10 normal weight, BMI = 22.1 kg/m(2)) walked on a level, dual-belt force measuring treadmill at six speeds (0.50-175 m/s). We used the individual limb method (ILM) to calculate external work done on the center of mass Absolute W-ext (J/step) was greater in obese vs. normal weight adults at each walking speed, but relative W-ext (J/step/kg) was similar between the groups. Step frequencies were not different. These results suggest that W-ext is not responsible for the greater metabolic cost of walking (W/kg) in moderately obese adults (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2273 / 2278
页数:6
相关论文
共 32 条
  • [31] WILLEMS PA, 1995, J EXP BIOL, V198, P379
  • [32] Giant Galapagos tortoises walk without inverted pendulum mechanical-energy exchange
    Zani, PA
    Gottschall, JS
    Kram, R
    [J]. JOURNAL OF EXPERIMENTAL BIOLOGY, 2005, 208 (08) : 1489 - 1494