The maximum velocity of shortening during the early phases of the contraction in frog single muscle fibres View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1984-10

AUTHORS

V. Lombardi, G. Menchetti

ABSTRACT

The maximum velocity of shortening (Vmax) was determined at preset times during the development and the plateau of isometric tetani in single fibres isolated from the tibialis anterior muscle of the frog. Experiments were performed at low temperature (3.6–6° C) and at about 2.25 µm sarcomere length. The controlled velocity release method was used.Vmax was measured by determining the lowest velocity of release required to keep the tension at zero. Extreme care was taken in dissection and mounting of the fibres in order to make the passive series compliance very small.The value ofVmax at the end of the latent period for the development of isometric tension (at 4.5° C about 10 ms after the beginning of the stimulus volley) was already the same as later during either the tension rise or at the plateau of isometric tetani. These results show that the value ofVmax of intact fibres is independent of time and activation subsequent to the latent period, and suggest that the cycling rate of the crossbridges may thus attain its steady-state value just at the end of the isometric latent period. More... »

PAGES

503-513

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00713257

DOI

http://dx.doi.org/10.1007/bf00713257

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019672499

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/6334695


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