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Mechanical and electrical oscillations in cardiac muscle of the turtle.
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MedLine Citation:
PMID:  4543065     Owner:  NLM     Status:  MEDLINE    
During contractures of the turtle ventricle rapid changes in length induce sinusoidal oscillations under isotonic conditions. They are due to delayed responses to stretching and release, which can be demonstrated also under isometric conditions. Oscillations of two distinct frequencies are produced under different conditions and are distinguished as high- and low-frequency oscillations. In depolarized muscles the frequency is such that the duration of one cycle is about the same as that of a normal twitch, while in high-Ca solutions the duration can be the same as in high-K solutions or about six times lower. As reported previously, twitches are followed by weak mechanical and electrical oscillations. Their frequency agrees with the high-frequency oscillations. The same effects can also be induced by stretching and release. It is suggested that the phenomena observed are due to feedback mechanisms which originate in the contractile mechanism. The high-frequency oscillations are similar to those observed previously in other muscles, particularly insect fibrillar muscle, and are not due to changes in Ca concentration. The other mechanisms involve the membrane and possibly the intracellular Ca stores.
E Bozler; J F Delahayes
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  The Journal of general physiology     Volume:  62     ISSN:  0022-1295     ISO Abbreviation:  J. Gen. Physiol.     Publication Date:  1973 Nov 
Date Detail:
Created Date:  1974-01-14     Completed Date:  1974-01-14     Revised Date:  2010-06-22    
Medline Journal Info:
Nlm Unique ID:  2985110R     Medline TA:  J Gen Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  523-34     Citation Subset:  IM    
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MeSH Terms
Calcium / pharmacology
Heart / drug effects,  physiology*
Muscle Contraction*
Potassium / pharmacology
Rana catesbeiana
Reg. No./Substance:
7440-09-7/Potassium; 7440-70-2/Calcium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): J Gen Physiol
ISSN: 0022-1295
ISSN: 1540-7748
Publisher: The Rockefeller University Press
Article Information
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Copyright © 1973 by The Rockefeller University Press
Received Day: 12 Month: 4 Year: 1973
Print publication date: Day: 1 Month: 11 Year: 1973
Volume: 62 Issue: 5
First Page: 523 Last Page: 534
ID: 2226136
PubMed Id: 4543065

Mechanical and Electrical Oscillations in Cardiac Muscle of the Turtle
Emil Bozler
J. F. Delahayes
From the Department of Physiology, The Ohio State University, Columbus, Ohio 43210

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