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Gilliver, Sally F and Jones, David A and Rittweger, Jörn and Degens, Hans (2011) Variation in the determinants of power of chemically skinned type I rat soleus muscle fibres. Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology, 197, pp. 311-319. Springer. ISSN 0340-7594.
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Abstract
We explored to which extent maximal velocity of shortening (Vmax), force per cross-sectional area (specific tension, Po) and curvature of the force–velocity relationship (a/Po in the Hill equation) contribute to differences in peak power of single, chemically skinned rat type I fibres. Force–velocity relationships were determined from isotonic contractions of 94 maximally activated fibres. Peak power (±SD) was 3.50 ± 1.64 W L-1. There was a tenfold range of peak power and five-, six- and fourfold ranges for Po, Vmax and a/Po, respectively. None of the differences between fibres was explicable by differences in myosin heavy or light chain composition. The inverse relationship between a/Po and Vmax suggests a similar underlying cause. Fitting the data to the Huxley (Progr Biophys Biophys Chem 7:255–318, 1957) crossbridge model showed that the rate constant g2 and the sum of the rate constants (f ? g1) co-varied, both being low in the slowest fibres. Approximately 16% of the variation in Po could be explained by variation in the proportion of attached cycling cross-bridges (f/(f ? g1)), but the origin of most of the variance in Po remains unknown.
| Item URL in elib: | https://elib.dlr.de/69423/ | ||||||||||||||||||||
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| Document Type: | Article | ||||||||||||||||||||
| Title: | Variation in the determinants of power of chemically skinned type I rat soleus muscle fibres | ||||||||||||||||||||
| Authors: |
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| Date: | 2011 | ||||||||||||||||||||
| Journal or Publication Title: | Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology | ||||||||||||||||||||
| Refereed publication: | Yes | ||||||||||||||||||||
| Open Access: | Yes | ||||||||||||||||||||
| Gold Open Access: | No | ||||||||||||||||||||
| In SCOPUS: | Yes | ||||||||||||||||||||
| In ISI Web of Science: | Yes | ||||||||||||||||||||
| Volume: | 197 | ||||||||||||||||||||
| Page Range: | pp. 311-319 | ||||||||||||||||||||
| Publisher: | Springer | ||||||||||||||||||||
| ISSN: | 0340-7594 | ||||||||||||||||||||
| Status: | Published | ||||||||||||||||||||
| Keywords: | Skeletal muscle � Skinned fibres � Power � Force–velocity relationship | ||||||||||||||||||||
| HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||||||||||
| HGF - Program: | Space (old) | ||||||||||||||||||||
| HGF - Program Themes: | W FR - Forschung unter Weltraumbedingungen (old) | ||||||||||||||||||||
| DLR - Research area: | Space | ||||||||||||||||||||
| DLR - Program: | W FR - Forschung unter Weltraumbedingungen | ||||||||||||||||||||
| DLR - Research theme (Project): | W - Vorhaben Integrative Studien (old) | ||||||||||||||||||||
| Location: | Köln-Porz | ||||||||||||||||||||
| Institutes and Institutions: | Institute of Aerospace Medicine > Space Physiology | ||||||||||||||||||||
| Deposited By: | Rittweger, Jörn | ||||||||||||||||||||
| Deposited On: | 16 Jun 2011 12:37 | ||||||||||||||||||||
| Last Modified: | 06 Sep 2019 15:27 |
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