Classical experiments in whole-body metabolism: open-circuit respirometry-diluted flow chamber, hood, or facemask systems.

European Journal of Applied Physiology
P F M Schoffelen, G Plasqui

Abstract

For over two centuries, scientists have measured gas exchange in animals and humans and linked this to energy expenditure of the body. The aim of this review is to provide a comprehensive overview of open-circuit diluted flow indirect calorimetry and to help researchers to make the optimal choice for a certain system and its application. A historical perspective shows that 'open circuit diluted flow' is a technique first used in the 19th century and applicable today for room calorimeters, ventilated hood systems, and facemasks. Room calorimeters are a classic example of an open-circuit diluted flow system. The broadly applied ventilated hood calorimeters follow the same principle and can be classified as a derivative of these room calorimeters. The basic principle is that the subject breathes freely in a passing airflow that is fully captured and analyzed. Oxygen and CO2 concentrations are measured in inlet ambient air and captured outlet air. The airflow, which is adapted depending on the application (e.g., rest versus exercise), is measured. For a room indirect calorimeter, the dilution in the large room volume is also taken into account, and this is the most complex application of this type of calorimeter. Validity of the sy...Continue Reading

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Citations

Oct 21, 2018·Scandinavian Journal of Medicine & Science in Sports·Paul F M SchoffelenGuy Plasqui
Feb 23, 2019·The American Journal of Clinical Nutrition·Leticia C R PereiraUNKNOWN ENRICH Study Team
Feb 28, 2018·European Journal of Applied Physiology·Nigel A S TaylorMichael I Lindinger
Jul 14, 2020·Current Opinion in Clinical Nutrition and Metabolic Care·Guillermo Sanchez-Delgado, Eric Ravussin
Jan 26, 2020·Physiological Reports·Simeng ZhangKumpei Tokuyama
Feb 28, 2021·Scandinavian Journal of Medicine & Science in Sports·Jordi P D KleinloogGuy Plasqui
Jul 23, 2021·The Journal of Nutrition·Elaine A YuAryeh D Stein

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