Efficiency of walking and stepping: Relationship to body fatness
Efficiency of walking and stepping: Relationship to body fatness
复制标题
DOI：
10.1038/oby.2004.120
复制
发表时间：
2004-06-01
期刊：
影响因子：
--
通讯作者：
Buchowski, MS
中科院分区：
文献类型：
--
作者：
Chen, KY;Acra, SA;Buchowski, MS
目的：确定异质性正常成人人群中行走和踏步的能量效率及其与体脂的相关性，并评估个体内和个体间的差异。研究方法和程序：采用全室间接量热计和大型精密测力平台的组合，我们同时测量了健康成年男性（n = 60）在步行和踏步过程中每分钟的能量消耗（EE）和机械功。女性（n = 85）。效率计算为机械功与活动EE的比率（百分比）。在同一天内比较不同强度下行走和踏步的效率，以获得再现性（上午和下午），并与受试者的特征相关。在0.9至1.2米/秒的速度下，男性和女性的步行效率与身体肥胖呈负相关，但在最慢速度下，男性与身体肥胖呈正相关，而女性则不相关（0.6米/秒）。在同一天内，不同强度的行走和踏步效率是可重复的。在相似的EE水平下，步行比踏步更有效率（26%至27% vs. 18%至22%，p < 0.01）。在踏步过程中，女性的效率显著高于男性（p < 0.01）。年龄，性别，体重，无脂肪的质量，健身（最大摄氧量），身高，和速度的变化促成的主题之间的差异efficiency.Discussion：肥胖的个人效率低于瘦个人在正常速度行走。行走和踏步效率的显著个体间差异可能归因于习惯和身体特征，如年龄，性别和健身水平。
Objective: To determine energetic efficiency of walking and stepping in a heterogeneous normal adult population and its association with body fatness and to assess within- and between-individual variations.Research Methods and Procedures: Using a combination of a whole-room indirect calorimeter and a large precision force platform, we simultaneously measured minute-by-minute energy expenditure (EE) and mechanical work during walking and stepping in healthy adult men (n = 60) and women (n = 85). Efficiency was calculated as a ratio (percentage) of mechanical work and EE of activity. Efficiency of walking and stepping performed at various intensities was compared for reproducibility within the same day (morning and afternoon) and correlated with a subject's characteristics.Results: The efficiency of walking was negatively correlated with body fatness in both men and women at 0.9 to 1.2 m/s but positively correlated with body fatness in men and not correlated in women at the slowest speed tested (0.6 m/s). Efficiency of walking and stepping of various intensities was reproducible during the same day. Compared at similar EE levels, walking was more efficient than stepping (26% to 27% vs. 18% to 22%, p < 0.01). Women were significantly (p < 0.01) more efficient than men during stepping. Age, sex, body mass, fat-free mass, fitness (maximal oxygen uptake), height, and speed variations contributed to the between-subject differences in efficiency.Discussion: Obese individuals were less efficient than lean individuals during normal-speed walking. Significant inter-individual variations in efficiency of walking and stepping may be attributed to habituation and physical characteristics such as age, sex, and fitness level.