Effect of precocious locomotor activity on the development of motoneurones and motor units of slow and fast muscles in rat

2007 ◽  
Vol 178 (1) ◽  
pp. 1-9 ◽  
Author(s):  
J. Sanusi ◽  
U. Sławińska ◽  
R. Navarrete ◽  
G. Vrbová
Keyword(s):  
Locomotor Activity ◽  
Motor Units ◽  
Fast Muscles ◽  
Slow And Fast Muscles

Mild aerobic training with blood flow restriction increases the hypertrophy index and MuSK in both slow and fast muscles of old rats: Role of PGC-1α

Life Sciences ◽  
2018 ◽  
Vol 202 ◽  
pp. 103-109 ◽  
Author(s):  
Mohammad-Ali Bahreinipour ◽  
Siyavash Joukar ◽  
Fariborz Hovanloo ◽  
Hamid Najafipour ◽  
Vida Naderi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Aerobic Training ◽  
Blood Flow Restriction ◽  
Flow Restriction ◽  
Old Rats ◽  
Fast Muscles ◽  
Slow And Fast Muscles

Effects of unweighting and clenbuterol on myosin light and heavy chains in fast and slow muscles of rat

2000 ◽  
Vol 279 (5) ◽  
pp. C1558-C1563 ◽  
Author(s):  
Laurence Stevens ◽  
Carole Firinga ◽  
Bärbel Gohlsch ◽  
Bruno Bastide ◽  
Yvonne Mounier ◽  
...  
Keyword(s):  
Light Chain ◽  
Extensor Digitorum Longus ◽  
Extensor Digitorum ◽  
Hindlimb Suspension ◽  
Adrenergic Agonist ◽  
Heavy Chains ◽  
Fast And Slow Muscles ◽  
Induced Changes ◽  
Fast Muscles ◽  
Slow And Fast Muscles

To investigate the plasticity of slow and fast muscles undergoing slow-to-fast transition, rat soleus (SOL), gastrocnemius (GAS), and extensor digitorum longus (EDL) muscles were exposed for 14 days to 1) unweighting by hindlimb suspension (HU), or 2) treatment with the β2-adrenergic agonist clenbuterol (CB), or 3) a combination of both (HU-CB). In general, HU elicited atrophy, CB induced hypertrophy, and HU-CB partially counteracted the HU-induced atrophy. Analyses of myosin heavy (MHC) and light chain (MLC) isoforms revealed HU- and CB-induced slow-to-fast transitions in SOL (increases of MHCIIa with small amounts of MHCIId and MHCIIb) and the upregulation of the slow MHCIa isoform. The HU- and CB-induced changes in GAS consisted of increases in MHCIId and MHCIIb (“fast-to-faster transitions”). Changes in the MLC composition of SOL and GAS consisted of slow-to-fast transitions and mainly encompassed an exchange of MLC1s with MLC1f. In addition, MLC3f was elevated whenever MHCIId and MHCIIb isoforms were increased. Because the EDL is predominantly composed of type IID and IIB fibers, HU, CB, and HU-CB had no significant effect on the MHC and MLC patterns.

scholarly journals Regeneration after cardiotoxin injury of innervated and denervated slow and fast muscles of mammals. Myosin isoform analysis

1988 ◽  
Vol 174 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Anne d'ALBIS ◽  
Rene COUTEAUX ◽  
Chantal JANMOT ◽  
Agnes ROULET ◽  
Jean-Claude MIRA
Keyword(s):  
Fast Muscles ◽  
Slow And Fast Muscles

Why are slow and fast muscles differentially affected during prenatal undernutrition?

1991 ◽  
Vol 14 (3) ◽  
pp. 259-267 ◽  
Author(s):  
Stephanie S. Ward ◽  
Neil C. Stickland
Keyword(s):  
Prenatal Undernutrition ◽  
Fast Muscles ◽  
Slow And Fast Muscles

scholarly journals Denervation and reinnervation of fast and slow muscles. A histochemical study in rats.

1975 ◽  
Vol 23 (11) ◽  
pp. 808-827 ◽  
Author(s):  
M M Jaweed ◽  
G J Herbison ◽  
J F Ditunno
Keyword(s):  
Fiber Diameter ◽  
Histochemical Study ◽  
Fiber Type ◽  
Type I ◽  
Fiber Types ◽  
Type Ii ◽  
Type I Fibers ◽  
Type Ii Fibers ◽  
Fast Muscles ◽  
Slow And Fast Muscles

A histochemical study, using myosin-adenosine triphosphatase activity at pH 9.4, was conducted in soleus and plantaris muscles of adult rats, after bilateral crushing of the sciatic nerve at the sciatic notch. The changes in fiber diameter and per cent composition of type I and type II fibers plus muscle weights were evaluated along the course of denervation-reinnervation curve at 1, 2, 3, 4 and 6 weeks postnerve crush. The study revealed that in the early denervation phase (up to 2 weeks postcrush) both the slow and fast muscles, soleus and plantaris, resepctively, atrophied similarly in muscle mass. Soleus increased in the number of type II fibers, which may be attributed to "disuse" effect. During the same period, the type I fibers of soleus atrophied as much or slightly more than the type II fibers; whereas the type II fibers of plantaris atrophied significantly more than the type I fibers, reflecting that the process of denervation, in its early stages, may affect the two fiber types differentially in the slow and fast muscles. It was deduced that the type I fibers of plantaris may be essentially different in the slow (soleus) and fast (plantaris) muscles under study. The onset of reinnervation, as determined by the increase in muscle weight and fiber diameter of the major fiber type, occurred in soleus and plantaris at 2 and 3 weeks postcrush, respectively, which confirms the earlier hypotheses that the slow muscles are reinnervated sooner than the fast muscles. It is suggested that the reinnervation of muscle after crush injury may be specific to the muscle type or its predominant fiber type.

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