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Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women

“Metabolic Equivalent” (MET) represents a standard amount of oxygen consumed by the body under resting conditions, and is defined as 3.5 mL O(2)/kg × min or ~1 kcal/kg × h. It is used to express the energy cost of physical activity in multiples of MET. However, universal application of the 1-MET sta...

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Autores principales: Melzer, Katarina, Heydenreich, Juliane, Schutz, Yves, Renaud, Anne, Kayser, Bengt, Mäder, Urs
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4963914/
https://www.ncbi.nlm.nih.gov/pubmed/27447667
http://dx.doi.org/10.3390/nu8070438
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author Melzer, Katarina
Heydenreich, Juliane
Schutz, Yves
Renaud, Anne
Kayser, Bengt
Mäder, Urs
author_facet Melzer, Katarina
Heydenreich, Juliane
Schutz, Yves
Renaud, Anne
Kayser, Bengt
Mäder, Urs
author_sort Melzer, Katarina
collection PubMed
description “Metabolic Equivalent” (MET) represents a standard amount of oxygen consumed by the body under resting conditions, and is defined as 3.5 mL O(2)/kg × min or ~1 kcal/kg × h. It is used to express the energy cost of physical activity in multiples of MET. However, universal application of the 1-MET standard was questioned in previous studies, because it does not apply well to all individuals. Height, weight and resting metabolic rate (RMR, measured by indirect calorimetry) were measured in adolescent males (n = 50) and females (n = 50), women during pregnancy (gestation week 35–41, n = 46), women 24–53 weeks postpartum (n = 27), and active men (n = 30), and were compared to values predicted by the 1-MET standard. The RMR of adolescent males (1.28 kcal/kg × h) was significantly higher than that of adolescent females (1.11 kcal/kg × h), with or without the effects of puberty stage and physical activity levels. The RMR of the pregnant and post-pregnant subjects were not significantly different. The RMR of the active normal weight (0.92 kcal/kg × h) and overweight (0.89 kcal/kg × h) adult males were significantly lower than the 1-MET value. It follows that the 1-MET standard is inadequate for use not only in adult men and women, but also in adolescents and physically active men. It is therefore recommended that practitioners estimate RMR with equations taking into account individual characteristics, such as sex, age and Body Mass Index, and not rely on the 1-MET standard.
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spelling pubmed-49639142016-08-03 Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women Melzer, Katarina Heydenreich, Juliane Schutz, Yves Renaud, Anne Kayser, Bengt Mäder, Urs Nutrients Article “Metabolic Equivalent” (MET) represents a standard amount of oxygen consumed by the body under resting conditions, and is defined as 3.5 mL O(2)/kg × min or ~1 kcal/kg × h. It is used to express the energy cost of physical activity in multiples of MET. However, universal application of the 1-MET standard was questioned in previous studies, because it does not apply well to all individuals. Height, weight and resting metabolic rate (RMR, measured by indirect calorimetry) were measured in adolescent males (n = 50) and females (n = 50), women during pregnancy (gestation week 35–41, n = 46), women 24–53 weeks postpartum (n = 27), and active men (n = 30), and were compared to values predicted by the 1-MET standard. The RMR of adolescent males (1.28 kcal/kg × h) was significantly higher than that of adolescent females (1.11 kcal/kg × h), with or without the effects of puberty stage and physical activity levels. The RMR of the pregnant and post-pregnant subjects were not significantly different. The RMR of the active normal weight (0.92 kcal/kg × h) and overweight (0.89 kcal/kg × h) adult males were significantly lower than the 1-MET value. It follows that the 1-MET standard is inadequate for use not only in adult men and women, but also in adolescents and physically active men. It is therefore recommended that practitioners estimate RMR with equations taking into account individual characteristics, such as sex, age and Body Mass Index, and not rely on the 1-MET standard. MDPI 2016-07-20 /pmc/articles/PMC4963914/ /pubmed/27447667 http://dx.doi.org/10.3390/nu8070438 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Melzer, Katarina
Heydenreich, Juliane
Schutz, Yves
Renaud, Anne
Kayser, Bengt
Mäder, Urs
Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women
title Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women
title_full Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women
title_fullStr Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women
title_full_unstemmed Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women
title_short Metabolic Equivalent in Adolescents, Active Adults and Pregnant Women
title_sort metabolic equivalent in adolescents, active adults and pregnant women
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4963914/
https://www.ncbi.nlm.nih.gov/pubmed/27447667
http://dx.doi.org/10.3390/nu8070438
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