School of Physical Education and Sport, Selçuk University, Alleaddin Keykubat Campus, Selçuklu/Konya, Turkey.
Obes Facts. 2012;5(3):327-38. doi: 10.1159/000339504. Epub 2012 Jun 12.
The aim of the present study is to examine the differences in fat and carbohydrate (CHO) oxidation during walking and running between normal-weight and overweight/obese young adult men.
19 healthy, normal-weight (age = 21.9 ± 0.7 years, BMI = 22.6 ± 0.4 kg, n = 10) and overweight (age = 21.4 ± 0.6 years, BMI = 31.6 ± 1.1, n = 9) young men volunteered to participate in this study. Body composition was assessed by bioelectrical impedance. Maximal oxygen uptake and maximal fat oxidation rate were determined with indirect calorimetry by using an incremental exercise test on a motor-driven treadmill. The participants' individual preferred transition speeds between walking and running were determined. Indirect calorimetry was used to calculate fat and CHO oxidation during the resting, walking and running tests.
Maximal fat oxidation rates during the graded exercise test were not significantly different between the groups. Changes in CHO and fat oxidation in the resting, walking and running tests were similar in the normal-weight and overweight groups.
The study results suggest that with regard to changes in CHO and fat oxidation, normal-weight and overweight/obese individuals have similar responses to walking and running at preferred speeds, despite significant differences in oxygen uptake during activity and body composition.
本研究旨在比较正常体重和超重/肥胖年轻男性在行走和跑步时的脂肪和碳水化合物（CHO）氧化差异。
19 名健康的正常体重（年龄=21.9±0.7 岁，BMI=22.6±0.4kg，n=10）和超重（年龄=21.4±0.6 岁，BMI=31.6±1.1，n=9）年轻男性志愿者参加了这项研究。身体成分通过生物电阻抗法评估。最大摄氧量和最大脂肪氧化率通过间接热量测定法在电动跑步机上进行递增运动试验来确定。确定参与者个人在行走和跑步之间的首选过渡速度。间接热量测定法用于计算休息、行走和跑步测试期间的脂肪和 CHO 氧化。
递增运动试验中最大脂肪氧化率在两组之间没有显著差异。在休息、行走和跑步测试中，CHO 和脂肪氧化的变化在正常体重组和超重组中相似。
研究结果表明，就 CHO 和脂肪氧化的变化而言，正常体重和超重/肥胖个体在以自身偏好速度行走和跑步时的反应相似，尽管活动期间的摄氧量和身体成分存在显著差异。
