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Large muscles are beneficial but not required for improving thermogenic capacity in small birds
It is generally assumed that small birds improve their shivering heat production capacity by developing the size of their pectoralis muscles. However, some studies have reported an enhancement of thermogenic capacity in the absence of muscle mass variation between seasons or thermal treatments. We t...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6143541/ https://www.ncbi.nlm.nih.gov/pubmed/30228279 http://dx.doi.org/10.1038/s41598-018-32041-w |
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author | Milbergue, Myriam S. Blier, Pierre U. Vézina, François |
author_facet | Milbergue, Myriam S. Blier, Pierre U. Vézina, François |
author_sort | Milbergue, Myriam S. |
collection | PubMed |
description | It is generally assumed that small birds improve their shivering heat production capacity by developing the size of their pectoralis muscles. However, some studies have reported an enhancement of thermogenic capacity in the absence of muscle mass variation between seasons or thermal treatments. We tested the hypothesis that an increase in muscle mass is not a prerequisite for improving avian thermogenic capacity. We measured basal (BMR) and summit (M(sum)) metabolic rates of black capped chickadees (Poecile atricapillus) acclimated to thermoneutral (27 °C) and cold (−10 °C) temperatures and obtained body composition data from dissections. Cold acclimated birds consumed 44% more food, and had 5% and 20% higher BMR and M(sum), respectively, compared to individuals kept at thermoneutrality. However, lean dry pectoralis and total muscle mass did not differ between treatments, confirming that the improvement of thermogenic capacity did not require an increase in skeletal muscle mass. Nevertheless, within temperature treatments, M(sum) was positively correlated with the mass of all measured muscles, including the pectoralis. Therefore, for a given acclimation temperature individuals with large muscles do benefit from muscle size in term of heat production but improving thermogenic capacity during cold acclimation likely requires an upregulation of cell functions. |
format | Online Article Text |
id | pubmed-6143541 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-61435412018-09-24 Large muscles are beneficial but not required for improving thermogenic capacity in small birds Milbergue, Myriam S. Blier, Pierre U. Vézina, François Sci Rep Article It is generally assumed that small birds improve their shivering heat production capacity by developing the size of their pectoralis muscles. However, some studies have reported an enhancement of thermogenic capacity in the absence of muscle mass variation between seasons or thermal treatments. We tested the hypothesis that an increase in muscle mass is not a prerequisite for improving avian thermogenic capacity. We measured basal (BMR) and summit (M(sum)) metabolic rates of black capped chickadees (Poecile atricapillus) acclimated to thermoneutral (27 °C) and cold (−10 °C) temperatures and obtained body composition data from dissections. Cold acclimated birds consumed 44% more food, and had 5% and 20% higher BMR and M(sum), respectively, compared to individuals kept at thermoneutrality. However, lean dry pectoralis and total muscle mass did not differ between treatments, confirming that the improvement of thermogenic capacity did not require an increase in skeletal muscle mass. Nevertheless, within temperature treatments, M(sum) was positively correlated with the mass of all measured muscles, including the pectoralis. Therefore, for a given acclimation temperature individuals with large muscles do benefit from muscle size in term of heat production but improving thermogenic capacity during cold acclimation likely requires an upregulation of cell functions. Nature Publishing Group UK 2018-09-18 /pmc/articles/PMC6143541/ /pubmed/30228279 http://dx.doi.org/10.1038/s41598-018-32041-w Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Milbergue, Myriam S. Blier, Pierre U. Vézina, François Large muscles are beneficial but not required for improving thermogenic capacity in small birds |
title | Large muscles are beneficial but not required for improving thermogenic capacity in small birds |
title_full | Large muscles are beneficial but not required for improving thermogenic capacity in small birds |
title_fullStr | Large muscles are beneficial but not required for improving thermogenic capacity in small birds |
title_full_unstemmed | Large muscles are beneficial but not required for improving thermogenic capacity in small birds |
title_short | Large muscles are beneficial but not required for improving thermogenic capacity in small birds |
title_sort | large muscles are beneficial but not required for improving thermogenic capacity in small birds |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6143541/ https://www.ncbi.nlm.nih.gov/pubmed/30228279 http://dx.doi.org/10.1038/s41598-018-32041-w |
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