Sharp T A, Reed G W, Sun M, Abumrad N N, Hill J O
Department of Pediatrics, Vanderbilt University, Nashville, Tennessee 37232.
Am J Physiol. 1992 Jul;263(1 Pt 1):E121-8. doi: 10.1152/ajpendo.1992.263.1.E121.
The relationship between exercise and energy expenditure is unclear, with some suggestions that exercise leads to increased energy expenditure over and beyond the increase due to the exercise itself. In this cross-sectional study, we examined the relationships among aerobic fitness level, body composition, and total daily energy expenditure in 78 subjects. Daily energy expenditure (determined in a whole room calorimeter) was significantly correlated with both fat-free mass (FFM) and aerobic fitness (estimated from maximum aerobic capacity or VO2max). However, multiple-regression analysis demonstrated that, after accounting for FFM, VO2max did not explain a significant amount of the remaining variation in energy expenditure. In addition, the relationship between resting metabolic rate and both FFM and VO2max was evaluated using data from 214 weight-stable subjects analyzed retrospectively. The results were identical with the results obtained from the 78 subjects in that VO2max did not have effects independent of FFM on energy expenditure. We conclude that aerobic fitness does not have a direct effect on energy expenditure. However, it may have effects that are mediated through body composition, since in both populations studied here, VO2max was positively correlated with FFM and negatively correlated with adiposity.
运动与能量消耗之间的关系尚不清楚，有一些观点认为，运动导致的能量消耗增加超过了运动本身所带来的增加量。在这项横断面研究中，我们调查了78名受试者的有氧适能水平、身体成分与每日总能量消耗之间的关系。每日能量消耗（通过全室热量计测定）与去脂体重（FFM）和有氧适能（根据最大有氧能力或最大摄氧量估算）均显著相关。然而，多元回归分析表明，在考虑去脂体重后，最大摄氧量并不能解释能量消耗中剩余的显著变异量。此外，利用对214名体重稳定的受试者进行回顾性分析得到的数据，评估了静息代谢率与去脂体重和最大摄氧量之间的关系。结果与在78名受试者中获得的结果一致，即最大摄氧量对能量消耗没有独立于去脂体重的影响。我们得出结论，有氧适能对能量消耗没有直接影响。然而，它可能通过身体成分产生影响，因为在我们研究的这两个人群中，最大摄氧量与去脂体重呈正相关，与肥胖呈负相关。
