Gill Pavreet K, Kipp Shalaya, Beck Owen N, Kram Rodger
Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.
School of Kinesiology, University of British Columbia, Vancouver, British Columbia, Canada.
J Appl Physiol (1985). 2023 Apr 1;134(4):887-890. doi: 10.1152/japplphysiol.00353.2022. Epub 2023 Feb 24.
Physiologists commonly use single-value energy equivalents (e.g., 20.1 kJ/LO and 20.9 kJ/LO) to convert oxygen uptake (V̇o) to energy, but doing so ignores how the substrate oxidation ratio (carbohydrate:fat) changes across aerobic intensities. Using either 20.1 kJ/LO or 20.9 kJ/LO can incur systematic errors of up to 7%. In most circumstances, the best approach for estimating energy expenditure is to measure both V̇o and V̇co and use accurate, species-appropriate stoichiometry. However, there are circumstances when V̇co measurements may be unreliable. In those circumstances, we recommend that the research report or compare only V̇o. We quantify that the common practice of using single-value oxygen uptake energy equivalents for exercising subjects can incur systematic errors of up to 7%. We argue that such errors can be greatly reduced if researchers measure both V̇o and V̇co and adopt appropriate stoichiometry equations.
生理学家通常使用单一值能量当量（例如，20.1 kJ/LO和20.9 kJ/LO）将摄氧量（V̇o）转换为能量，但这样做忽略了底物氧化比（碳水化合物：脂肪）在有氧强度范围内的变化。使用20.1 kJ/LO或20.9 kJ/LO都可能产生高达7%的系统误差。在大多数情况下，估计能量消耗的最佳方法是同时测量V̇o和V̇co，并使用准确的、适合物种的化学计量法。然而，在某些情况下，V̇co测量可能不可靠。在这些情况下，我们建议研究报告仅报告或比较V̇o。我们量化了对运动受试者使用单一值摄氧量能量当量的常见做法可能产生高达7%的系统误差。我们认为，如果研究人员同时测量V̇o和V̇co并采用适当的化学计量方程，这些误差可以大大减少。
