Foster G D, Wadden T A, Kendrick Z V, Letizia K A, Lander D P, Conill A M
University of Pennsylvania School of Medicine, Philadephia, USA.
Med Sci Sports Exerc. 1995 Jun;27(6):888-94.
The purpose of this study was to determine whether significant weight loss reduced the energy cost of activity more than that expected based on decreased body weight. Standing energy expenditure was measured and subtracted from the total energy cost of walking to determine ambulatory energy expenditure (AEE). The energy cost of walking was determined in 11 obese women at baseline, week 9 [after 8 wk of a 1758-3349 kJ.d-1 diet], and week 22 (after 2 wk of weight stability). AEE accounted for 80% of the energy cost of walking. Body weight was the principal determinant of AEE, but the relationship was not 1:1. Subjects reduced body weight by 13% at week 9 and 21% at week 22. Analyses which controlled for the relationship between AEE and weight at baseline, showed no change in AEE at week 9. By contrast, at week 22, AEE was reduced more than expected based on a lower body weight. These findings suggest that after significant weight loss, reduced-obese persons will expend less energy for the same activity, even after accounting for the decrease in body weight. These data also suggest that weight-based estimates of exercise energy expenditure may be inappropriate after significant weight loss.
本研究的目的是确定显著的体重减轻是否比基于体重下降所预期的更多地降低了活动的能量消耗。测量静息能量消耗，并从步行的总能量消耗中减去，以确定动态能量消耗（AEE）。在11名肥胖女性的基线、第9周（在1758 - 3349 kJ·d⁻¹饮食8周后）和第22周（体重稳定2周后）测定步行的能量消耗。AEE占步行能量消耗的80%。体重是AEE的主要决定因素，但这种关系不是1:1。受试者在第9周体重减轻了13%，在第22周体重减轻了21%。对基线时AEE与体重之间关系进行控制的分析表明，第9周时AEE没有变化。相比之下，在第22周时，AEE的降低幅度超过了基于较低体重所预期的幅度。这些发现表明，在显著体重减轻后，即使考虑到体重的下降，肥胖程度减轻的人在进行相同活动时消耗的能量也会减少。这些数据还表明，在显著体重减轻后，基于体重的运动能量消耗估计可能并不合适。
