Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships
To relate in vivo behavior of fascicle segments within a muscle to their in vitro force-length relationships, we examined the strain behavior of paired segments within each of three vertebrate muscles. After determining in vivo muscle activity patterns and length changes of in-series segments within...
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ftpubmed:oai:pubmedcentral.nih.gov:6104704 2023-05-15T18:05:44+02:00 Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships Ahn, A N Konow, N Tijs, C Biewener, A A 2018-08 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104704/ http://www.ncbi.nlm.nih.gov/pubmed/29889253 https://doi.org/10.1093/icb/icy040 en eng Oxford University Press http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104704/ http://www.ncbi.nlm.nih.gov/pubmed/29889253 http://dx.doi.org/10.1093/icb/icy040 © The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. All rights reserved. For permissions please email: journals.permissions@oup.com. https://academic.oup.com/journals/pages/about_us/legal/notices This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices) Spatial Scale and Structural Heterogeneity in Skeletal Muscle Performance Text 2018 ftpubmed https://doi.org/10.1093/icb/icy040 2019-08-04T00:15:59Z To relate in vivo behavior of fascicle segments within a muscle to their in vitro force-length relationships, we examined the strain behavior of paired segments within each of three vertebrate muscles. After determining in vivo muscle activity patterns and length changes of in-series segments within the semimembranosus muscle (SM) in the American Toad (Bufo americanus) during hopping and within the sternohyoid (SH) muscle in the rat (Rattus rattus) during swallowing, and of spatially separated fascicles within the medial gastrocnemius (MG) muscle in the rat during trotting, we measured their corresponding in vitro (toad) or in situ (rat) force–length relationships (FLRs). For all three muscles, in vivo strain heterogeneity lasted for about 36–57% of the behavior cycle, during which one segment or fascicle shortened while the other segment or fascicle simultaneously lengthened. In the toad SM, the proximal segment shortened from the descending limb across the plateau of its FLR from 1.12 to 0.91 of its optimal length (L(o)), while the distal segment lengthened (by 0.04 ± 0.04 L(o)) before shortening down the ascending limb from 0.94 to 0.83 L(o). In the rat SH muscle, the proximal segment tended to shorten on its ascending limb from 0.90 to 0.85 L(o) while the distal segment tended to lengthen across L(o) (0.96–1.12 L(o)). In the rat MG muscle, in vivo strains of proximal fascicles ranged from 0.72 to 1.02 L(o), while the distal fascicles ranged from 0.88 to 1.11 L(o). Even though the timing of muscle activation patterns were similar between segments, the heterogeneous strain patterns of fascicle segments measured in vivo coincided with different operating ranges across their FLRs simultaneously, implying differences in force–velocity behavior as well. The three vertebrate skeletal muscles represent a diversity of fiber architectures and functions and suggest that patterns of in vivo contractile strain and the operating range over the FLR in one muscle region does not necessarily represent other regions within ... Text Rattus rattus PubMed Central (PMC) Integrative and Comparative Biology 58 2 219 231 |
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Open Polar |
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PubMed Central (PMC) |
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language |
English |
topic |
Spatial Scale and Structural Heterogeneity in Skeletal Muscle Performance |
spellingShingle |
Spatial Scale and Structural Heterogeneity in Skeletal Muscle Performance Ahn, A N Konow, N Tijs, C Biewener, A A Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships |
topic_facet |
Spatial Scale and Structural Heterogeneity in Skeletal Muscle Performance |
description |
To relate in vivo behavior of fascicle segments within a muscle to their in vitro force-length relationships, we examined the strain behavior of paired segments within each of three vertebrate muscles. After determining in vivo muscle activity patterns and length changes of in-series segments within the semimembranosus muscle (SM) in the American Toad (Bufo americanus) during hopping and within the sternohyoid (SH) muscle in the rat (Rattus rattus) during swallowing, and of spatially separated fascicles within the medial gastrocnemius (MG) muscle in the rat during trotting, we measured their corresponding in vitro (toad) or in situ (rat) force–length relationships (FLRs). For all three muscles, in vivo strain heterogeneity lasted for about 36–57% of the behavior cycle, during which one segment or fascicle shortened while the other segment or fascicle simultaneously lengthened. In the toad SM, the proximal segment shortened from the descending limb across the plateau of its FLR from 1.12 to 0.91 of its optimal length (L(o)), while the distal segment lengthened (by 0.04 ± 0.04 L(o)) before shortening down the ascending limb from 0.94 to 0.83 L(o). In the rat SH muscle, the proximal segment tended to shorten on its ascending limb from 0.90 to 0.85 L(o) while the distal segment tended to lengthen across L(o) (0.96–1.12 L(o)). In the rat MG muscle, in vivo strains of proximal fascicles ranged from 0.72 to 1.02 L(o), while the distal fascicles ranged from 0.88 to 1.11 L(o). Even though the timing of muscle activation patterns were similar between segments, the heterogeneous strain patterns of fascicle segments measured in vivo coincided with different operating ranges across their FLRs simultaneously, implying differences in force–velocity behavior as well. The three vertebrate skeletal muscles represent a diversity of fiber architectures and functions and suggest that patterns of in vivo contractile strain and the operating range over the FLR in one muscle region does not necessarily represent other regions within ... |
format |
Text |
author |
Ahn, A N Konow, N Tijs, C Biewener, A A |
author_facet |
Ahn, A N Konow, N Tijs, C Biewener, A A |
author_sort |
Ahn, A N |
title |
Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships |
title_short |
Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships |
title_full |
Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships |
title_fullStr |
Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships |
title_full_unstemmed |
Different Segments within Vertebrate Muscles Can Operate on Different Regions of Their Force–Length Relationships |
title_sort |
different segments within vertebrate muscles can operate on different regions of their force–length relationships |
publisher |
Oxford University Press |
publishDate |
2018 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104704/ http://www.ncbi.nlm.nih.gov/pubmed/29889253 https://doi.org/10.1093/icb/icy040 |
genre |
Rattus rattus |
genre_facet |
Rattus rattus |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104704/ http://www.ncbi.nlm.nih.gov/pubmed/29889253 http://dx.doi.org/10.1093/icb/icy040 |
op_rights |
© The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Integrative and Comparative Biology. All rights reserved. For permissions please email: journals.permissions@oup.com. https://academic.oup.com/journals/pages/about_us/legal/notices This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices) |
op_doi |
https://doi.org/10.1093/icb/icy040 |
container_title |
Integrative and Comparative Biology |
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58 |
container_issue |
2 |
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219 |
op_container_end_page |
231 |
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1766177241506512896 |