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PMID: 6747875 Published · ppublish English Journal Article

The force-velocity relation of rat fast- and slow-twitch muscles examined at different temperatures.

The Journal of physiology ·Vol. 351 ·1984-06-00 ·Pages 517-29

Ranatunga KW

Abstract

The steady-state force-velocity relation was examined at temperatures between 35 and 10 degrees C in rat fast-twitch (extensor digitorum longus, e.d.l.) and slow-twitch (soleus) muscle preparations in vitro, with direct stimulation, and employing the isotonic release technique. The curvature of the force-velocity relation increased with cooling in both muscles; the increase was more pronounced below 25 degrees C. The maximum shortening velocity of e.d.l. muscle decreased with a Q10 (temperature coefficient) of 1.8 in cooling from 35 to 25 degrees C; it decreased with a Q10 of 2.4 in cooling below 20 degrees C. The shortening velocity of slow muscle was more temperature sensitive. The Q10 values for soleus muscle were 2.0 at 35-25 degrees C and 3.5 below 20 degrees C. The maximum rate of isometric tetanic tension rise had a temperature sensitivity similar to the maximum velocity of shortening in each muscle type.

MeSH Terms
Animals Biomechanical Phenomena Hindlimb In Vitro Techniques Isometric Contraction Isotonic Contraction Male Muscle Contraction Muscles/physiology Rats Temperature
Authors & Affiliations
1 authors, click to expand affiliations / ORCID
Ranatunga K W
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Article Info
Journal
The Journal of physiology
Abbr.
J Physiol
ISSN
0022-3751
DOI
10.1113/jphysiol.1984.sp015260
Published
1984-06-00
Pages
517-29
Language
English
Region
England
NLM ID
0266262
PMCID
PMC1193132
Subset
IM
External Links
PubMed source DOI: 10.1113/jphysiol.1984.sp015260 PMC Full Text View journal details
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