Aull Jennifer L, Rowe David A, Hickner Robert C, Malinauskas Brenda M, Mahar Matthew T
Department of Exercise and Sport Science, East Carolina University, Greenville, NC 27858, USA.
Int J Pediatr Obes. 2008;3(3):177-85. doi: 10.1080/17477160701874844.
To quantify energy expenditure of various lifestyle physical activities of obese, overweight, and normal-weight girls.
In total, fifty-five girls participated in six activities: a treadmill walk at 4.0 km x hr(-1), run, football throw, walk in open area, cycle, and riding a scooter. Intensities for all activities except the treadmill walk were self-selected. Energy expenditure was measured using the COSMED K4b(2) portable metabolic system. Analyses of variance were used to compare the three groups (obese n = 11, overweight n = 16, and normal weight n = 28) on relative VO2 (ml x kg(-1) x min(-1) and ml x FFM(-1) x min(-1)), and absolute energy expenditure (kJ x min(-1)). Magnitudes of the mean differences were examined using Cohen's delta (ES).
Relative VO2 (ml x FFM(-1) x min(-1)) was not significantly different (p > 0.05) among the groups for any activity. Obese girls expended more energy (p < 0.05) than normal-weight girls on all weight bearing activities. These differences were large (ES > or = 0.91). The differences in kJ x min(-1) between the obese and normal weight groups for the bicycle and scooter activities were moderate to large (ES > or = 0.56), although not statistically significant. The overweight group expended more energy than the normal weight group and less energy than the obese group on all activities (ES = 0.17 to 1.82), although these differences were generally not statistically significant.
The oxygen costs of various activities are similar among obese, overweight, and normal-weight girls when expressed relative to fat-free mass. When engaging in self-selected levels of activity, obese girls have a higher absolute energy expenditure than normal-weight girls.
量化肥胖、超重及体重正常女孩各种生活方式体力活动的能量消耗。
共有55名女孩参与了六项活动：以4.0千米/小时的速度在跑步机上行走、跑步、扔足球、在开阔区域行走、骑自行车和骑踏板车。除在跑步机上行走外，所有活动的强度均由受试者自行选择。使用COSMED K4b(2)便携式代谢系统测量能量消耗。采用方差分析比较三组（肥胖组n = 11，超重组n = 16，正常体重组n = 28）在相对摄氧量（毫升/千克⁻¹·分钟⁻¹和毫升/去脂体重⁻¹·分钟⁻¹）及绝对能量消耗（千焦/分钟）方面的差异。使用科恩效应量（ES）检验平均差异的大小。
在任何活动中，各组之间的相对摄氧量（毫升/去脂体重⁻¹·分钟⁻¹）均无显著差异（p > 0.05）。在所有负重活动中，肥胖女孩比体重正常的女孩消耗更多能量（p < 0.05）。这些差异较大（ES ≥ 0.91）。在骑自行车和骑踏板车活动中，肥胖组与正常体重组之间千焦/分钟的差异为中度至较大（ES ≥ 0.56），尽管无统计学意义。在所有活动中，超重组比正常体重组消耗更多能量，但比肥胖组消耗更少能量（ES = 0.17至1.82），尽管这些差异通常无统计学意义。
相对于去脂体重而言，肥胖、超重及体重正常女孩进行各种活动时的氧耗相似。在进行自行选择强度的活动时，肥胖女孩的绝对能量消耗高于体重正常的女孩。
