Abstract
Indirect calorimetry (IC) measurements to estimate resting energy expenditure (REE) necessitate a stable measurement period or steady state (SS). There is limited evidence when assessing the time to reach SS in young, healthy adults. The aims of this prospective study are to determine the approximate time to necessary reach SS using open-circuit IC and to establish the appropriate duration of SS needed to estimate REE. One hundred young, healthy participants (54 males and 46 females; age = 20.6 ± 2.1 years; body weight = 73.6 ± 16.3 kg; height 172.5 ± 9.3 cm; BMI = 24.5 ± 3.8 kg/m2) completed IC measurement for approximately 30 min while the volume of oxygen (VO2) and volume of carbon dioxide (VCO2) were collected. SS was defined by variations in the VO2 and VCO2 of ≤10% coefficient of variation (%CV) over a period of five consecutive minutes. The 30-min IC measurement was divided into six 5-min segments, such as S1, S2, S3, S4, S5, and S6. The results show that SS was achieved during S2 (%CV = 6.81 ± 3.2%), and the %CV continued to met the SS criteria for the duration of the IC measurement (S3 = 8.07 ± 4.4%, S4 = 7.93 ± 3.7%, S5 = 7.75 ± 4.1%, and S6 = 8.60 ± 4.6%). The current study found that in a population of young, healthy adults the duration of the IC measurement period could be a minimum of 10 min. The first 5-min segment was discarded, while SS occurred by the second 5-min segment.
Highlights
Resting energy expenditure (REE) is the 24-h energy expenditure that reflects the total amount of energy needed to maintain basic physiological function and homeostasis [1, 2]
REE is the largest component of total energy expenditure (TEE), and other components include the thermic effect of food and physical activity energy expenditure
REE is an important measure for clinicians and researchers who provide nutrition support in order to maintain energy balance and establish a Abbreviations: %CV, percent coefficient of variation; BMI, body mass index; IC, indirect calorimetry; REE, resting energy expenditure; SS, steady state; TEE, total energy expenditure; VCO2, volume of carbon dioxide; VO2, volume of oxygen
Summary
Resting energy expenditure (REE) is the 24-h energy expenditure that reflects the total amount of energy needed to maintain basic physiological function and homeostasis [1, 2]. REE is the largest component of total energy expenditure (TEE), and other components include the thermic effect of food and physical activity energy expenditure. REE is an important measure for clinicians and researchers who provide nutrition support in order to maintain energy balance and establish a Abbreviations: %CV, percent coefficient of variation; BMI, body mass index; IC, indirect calorimetry; REE, resting energy expenditure; SS, steady state; TEE, total energy expenditure; VCO2, volume of carbon dioxide; VO2, volume of oxygen. Steady-state Resting Energy Expenditure physiological baseline of energy expenditure [3]. IC measurements require an individual lay supine in the postabsorptive state for 30–60 min while both VO2 and VCO2 are recorded [5,6,7,8,9]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
