Several factors may alter apparent resting metabolic rate (RMR) during measurement with indirect calorimetry. Likewise, numerous indirect calorimetry measurement protocols have been developed over the years, and the methodology employed could influence test results. As part of a larger project to determine the role of indirect calorimetry in clinical practice, a systematic review of the literature was undertaken to determine the ideal subject condition and test methodology for obtaining reliable measurement of RMR with indirect calorimetry. Food, ethanol, caffeine, and nicotine affect RMR for a variable number of hours after consumption; therefore, intake of these items must be controlled before measurement. Activities of daily living increase metabolic rate, but a short rest (< or =20 minutes) before testing is sufficient for the effect to dissipate. Moderate or vigorous physical activity has a longer carryover effect and therefore must be controlled in the hours before a measurement of RMR is attempted. Limited data were found regarding ideal ambient conditions for RMR testing. Measurement duration of 10 minutes with the first 5 minutes deleted and the remaining 5 minutes having a coefficient of variation <10% gave accurate readings of RMR. Individuals preparing for RMR measurement via indirect calorimetry should refrain from eating, consuming ethanol and nicotine, smoking, and engaging in physical activity for varying times before measurement. The test site should be physically comfortable and the individual should have 10 to 20 minutes to rest before measurement commences. A 10-minute test duration with the first 5 minutes discarded and the remaining 5 minutes having a coefficient of variation of <10% will give an accurate measure of RMR.
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http://dx.doi.org/10.1016/j.jada.2006.02.009 | DOI Listing |
Int J Obes (Lond)
January 2025
Department of Health, Kinesiology, and Applied Physiology, Concordia University, Montreal, QC, Canada.
Objective: Compared to adulthood-onset obesity (AO), those with childhood-onset obesity (CO) are at greater risk of metabolic disease. However, the differences between these two obesity phenotypes are not clear. The aim of this study is to investigate how the age of obesity onset (CO vs.
View Article and Find Full Text PDFObjective: This study aimed to compare physiological changes when wearing a N95 and surgical mask at rest.
Methods: 42 subjects aged 18-55 (19 males; age 22.98 ± 3.
Genes (Basel)
January 2025
Fondazione IRCSS Ca' Granda Ospedale Maggiore Policlinico, 20122 Milano, Italy.
Mendelian disorders of the epigenetic machinery (MDEMs) include a large number of conditions caused by defective activity of a member of the epigenetic machinery. MDEMs are characterized by multiple congenital abnormalities, intellectual disability and abnormal growth. that can be variably up- or down-regulated.
View Article and Find Full Text PDFAm J Physiol Endocrinol Metab
January 2025
Human and Animal Physiology, Wageningen University, Wageningen, The Netherlands.
The Respiratory Exchange Ratio (RER), which is the ratio of total carbon dioxide produced over total oxygen consumed, serves as a qualitative measure to determine the substrate usage of a particular organism on the whole-body level. Quantification of RER by its direct conversion into %Glucose (%G) and %Lipid oxidation (%L) at a given timepoint can be done by utilizing nonprotein respiratory quotient tables. These tables, however, are limited to specific increments, and intermediate RER values are not covered by these tables.
View Article and Find Full Text PDFMol Metab
January 2025
Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Alabama at Birmingham, Birmingham, AL 35294, USA; UAB Comprehensive Diabetes Center, USA. Electronic address:
Objective: Obesity-associated metabolic dysfunction is a major public health concern worldwide. Endothelial dysfunction is a hallmark of metabolic dysfunction, and endothelial cells affect metabolic functions. Because autophagy-related gene 7 (ATG7) is involved in various cellular physiology, we investigated the roles of endothelial cell-ATG7 (EC-ATG7) on high-fat diet-induced obesity and its related metabolic dysfunction.
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