Am J Physiol Cell Physiol Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Am J Physiol Cell Physiol 266: C919-C924, 1994;
0363-6143/94 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Nelson, A. G.
Right arrow Articles by Thompson, W. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Nelson, A. G.
Right arrow Articles by Thompson, W. J.

AJP - Cell Physiology, Vol 266, Issue 4 C919-C924, Copyright © 1994 by American Physiological Society

ARTICLES

Contractile properties and myosin phenotype of single motor units from neonatal rats

A. G. Nelson and W. J. Thompson
Department of Kinesiology, Louisiana State University, Baton Rouge 70803.

The unloaded shortening velocity (Vus), twitch time to peak force (TTP), and myosin heavy chain (MHC) composition of motor units from soleus muscles of neonatal rats (7-8 and 16-18 days) were compared. The Vus range was from 2.2 to 7.1 fiber lengths (fl).s-1 and was unchanged from 7-8 to 16-18 days. TTP shifted from 7-8 (range, 66-120) to 16-18 days (range, 41-95). MHC-specific antibody staining of motor units revealed a correlation between MHC and Vus of individual motor units. Slowest motor units contained type I MHC. Intermediate Vus motor units contained both embryonic, neonatal, and/or type IIa MHCs. Fastest motor units contained neonatal and/or type IIa MHCs. These findings demonstrate that an individual motor unit of a neonatal muscle contains a nonrandom distribution of fiber types. The range of myosins present within the motor units of the soleus translates into a range of possible Vus.


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
P. Aagaard, E. B. Simonsen, J. L. Andersen, P. Magnusson, and P. Dyhre-Poulsen
Increased rate of force development and neural drive of human skeletal muscle following resistance training
J Appl Physiol, October 1, 2002; 93(4): 1318 - 1326.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Respir. Crit. Care Med.Home page
C. COIRAULT, F. LAMBERT, T. JOSEPH, F.-X. BLANC, D. CHEMLA, and Y. LECARPENTIER
Developmental Changes in Crossbridge Properties and Myosin Isoforms in Hamster Diaphragm
Am. J. Respir. Crit. Care Med., September 1, 1997; 156(3): 959 - 967.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online