Department of Nutrition & Food Sciences, Texas Woman's University, Houston, Texas, USA.
Institute for Women's Health, College of Health Sciences, Houston, Texas, USA.
Physiol Rep. 2024 May;12(10):e16023. doi: 10.14814/phy2.16023.
To determine whether body fat and body mass index (BMI) affect the energy cost of walking (Cw; J/kg/m), ventilation, and gas exchange data from 205 adults (115 females; percent body fat range = 3.0%-52.8%; BMI range = 17.5-43.2 kg/m) were obtained at rest and during treadmill walking at 1.34 m/s to calculate gross and net Cw. Linear regression was used to assess relationships between body composition indices, Cw, and standing metabolic rate (SMR). Unpaired t-tests were used to assess differences between sex, and one-way ANOVA was used to assess differences by BMI categories: normal weight, <25.0 kg/m; overweight, 25.0-29.9 km/m; and obese, ≥30 kg/m. Net Cw was not related to body fat percent, fat mass, or BMI (all R ≤ 0.011). Furthermore, mean net Cw was similar by sex (male: 2.19 ± 0.30 J/kg/m; female: 2.24 ± 0.37 J/kg/m, p = 0.35) and across BMI categories (normal weight: 2.23 ± 0.36 J/kg/m; overweight: 2.18 ± 0.33 J/kg/m; obese: 2.26 ± 0.31, p = 0.54). Gross Cw and SMR were inversely associated with percent body fat, fat mass, and BMI (all R between 0.033 and 0.270; all p ≤ 0.008). In conclusion, Net Cw is not influenced by body fat percentage, total body fat, and BMI and does not differ by sex.
为了确定体脂肪和体重指数（BMI）是否影响步行的能量消耗（Cw；J/kg/m）、通气和气体交换数据，从 205 名成年人（115 名女性；体脂百分比范围为 3.0%-52.8%；BMI 范围为 17.5-43.2 kg/m）中获得，在跑步机上以 1.34 m/s 的速度行走以计算总 Cw 和净 Cw。线性回归用于评估身体成分指数、Cw 和静息代谢率（SMR）之间的关系。使用独立样本 t 检验评估性别之间的差异，使用单因素方差分析评估 BMI 类别之间的差异：正常体重，<25.0 kg/m；超重，25.0-29.9 kg/m；肥胖，≥30 kg/m。净 Cw 与体脂百分比、脂肪量或 BMI 无关（所有 R ≤ 0.011）。此外，男女之间的平均净 Cw 相似（男性：2.19 ± 0.30 J/kg/m；女性：2.24 ± 0.37 J/kg/m，p = 0.35），且跨越 BMI 类别（正常体重：2.23 ± 0.36 J/kg/m；超重：2.18 ± 0.33 J/kg/m；肥胖：2.26 ± 0.31，p = 0.54）。总 Cw 和 SMR 与体脂百分比、脂肪量和 BMI 呈负相关（所有 R 在 0.033 到 0.270 之间；所有 p ≤ 0.008）。总之，净 Cw 不受体脂百分比、全身脂肪和 BMI 的影响，且不因性别而异。
