Stretch activation of skeletal muscle fibre types.
In a number of studies it has been attempted to build up a correlation between maximal unloaded shortening velocity and the different fibre types of skeletal muscles; but not always a correlation was observed. In the present study on histochemically defined fibre types of rat, fish, crayfish and locust skeletal muscles, it has been found that the kinetics of stretch-induced delayed force increase (stretch activation) shows a much greater variance and a stronger correlation with fibre type than does unloaded shortening velocity. Thus, the stretch activation experiment allows a reliable identification of muscle fibre types. In addition, information can be deduced about crossbridge cycling steps in muscle fibre types and their determination by myofibrillar proteins.
Galler
S
S
Institute of Zoology, University of Salzburg, Austria.
D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D003400:Astacoidea; D002118:Calcium / Q000378:metabolism; D005399:Fishes; D006110:Grasshoppers; D006651:Histocytochemistry; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D009132:Muscles / Q000033:anatomy & histology / Q000502:physiology*; D009210:Myofibrils / Q000201:enzymology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013314:Stress, Mechanical
D000251:Adenosine Triphosphatases; D002118:Calcium