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Gilliver, Sally F und Jones, David A und Rittweger, Jörn und 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, Seiten 311-319. Springer. ISSN 0340-7594.
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Kurzfassung
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.
| elib-URL des Eintrags: | https://elib.dlr.de/69423/ | ||||||||||||||||||||
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| Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||
| Titel: | Variation in the determinants of power of chemically skinned type I rat soleus muscle fibres | ||||||||||||||||||||
| Autoren: |
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| Datum: | 2011 | ||||||||||||||||||||
| Erschienen in: | Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology | ||||||||||||||||||||
| Referierte Publikation: | Ja | ||||||||||||||||||||
| Open Access: | Ja | ||||||||||||||||||||
| Gold Open Access: | Nein | ||||||||||||||||||||
| In SCOPUS: | Ja | ||||||||||||||||||||
| In ISI Web of Science: | Ja | ||||||||||||||||||||
| Band: | 197 | ||||||||||||||||||||
| Seitenbereich: | Seiten 311-319 | ||||||||||||||||||||
| Verlag: | Springer | ||||||||||||||||||||
| ISSN: | 0340-7594 | ||||||||||||||||||||
| Status: | veröffentlicht | ||||||||||||||||||||
| Stichwörter: | Skeletal muscle � Skinned fibres � Power � Force–velocity relationship | ||||||||||||||||||||
| HGF - Forschungsbereich: | Verkehr und Weltraum (alt) | ||||||||||||||||||||
| HGF - Programm: | Weltraum (alt) | ||||||||||||||||||||
| HGF - Programmthema: | W FR - Forschung unter Weltraumbedingungen (alt) | ||||||||||||||||||||
| DLR - Schwerpunkt: | Weltraum | ||||||||||||||||||||
| DLR - Forschungsgebiet: | W FR - Forschung unter Weltraumbedingungen | ||||||||||||||||||||
| DLR - Teilgebiet (Projekt, Vorhaben): | W - Vorhaben Integrative Studien (alt) | ||||||||||||||||||||
| Standort: | Köln-Porz | ||||||||||||||||||||
| Institute & Einrichtungen: | Institut für Luft- und Raumfahrtmedizin > Weltraumphysiologie | ||||||||||||||||||||
| Hinterlegt von: | Rittweger, Jörn | ||||||||||||||||||||
| Hinterlegt am: | 16 Jun 2011 12:37 | ||||||||||||||||||||
| Letzte Änderung: | 06 Sep 2019 15:27 |
Verfügbare Versionen dieses Eintrags
- Variation in the determinants of power of chemically skinned type I rat soleus muscle fibres. (deposited 16 Jun 2011 12:37) [Gegenwärtig angezeigt]
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