Contractile properties of mouse single muscle fibers, a comparison with amphibian muscle fibers

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Contractile properties of mouse single muscle fibers, a comparison with amphibian muscle fibers.

Single fibers, 25-40 microm wide and 0.5-0.7 mm long, were isolated from the flexor digitorum brevis muscle of the mouse. Force and movement were recorded (21-27 degrees C) from the fiber as a whole and, in certain experiments, from a short marked segment that was held at constant length by feedback control. The maximum tetanic force, 368+/-57 kN/m2 (N = 10), was not significantly different fro...

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It was shown earlier (Mikawa 1979; Prochniewicz 1979) that crosslinking of thin filaments in vitro by glutaraldehyde can "'freeze'" their structure either in the activated (in the presence of Ca"-ions) or depressed (in the absence of C a t ions) state. This treatment does not inhibit the ability of actin to bind to myosin heads and to activate myosin ATPase (Lehrer 1981; Prochniewicz-Nakayama a...

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Myosin Isoforms and Contractile Properties of Single Fibers of Human Latissimus Dorsi Muscle

The aim of our study was to investigate fiber type distribution and contractile characteristics of Latissimus Dorsi muscle (LDM). Samples were collected from 18 young healthy subjects (9 males and 9 females) through percutaneous fine needle muscle biopsy. The results showed a predominance of fast myosin heavy chain isoforms (MyHC) with 42% of MyHC 2A and 25% of MyHC 2X, while MyHC 1 represented...

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Age-related changes in contractile properties of single skeletal fibers from the soleus muscle.

Peak absolute force, specific tension (peak absolute force per cross-sectional area), cross-sectional area, maximal unloaded shortening velocity (Vo; determined by the slack test), and myosin heavy chain (MHC) isoform compositions were determined in 124 single skeletal fibers from the soleus muscle of 12-, 24-, 30-, 36-, and 37-mo-old Fischer 344 Brown Norway F1 Hybrid rats. All fibers expresse...

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ژورنال

عنوان ژورنال: Journal of Experimental Biology

سال: 2005

ISSN: 1477-9145,0022-0949

DOI: 10.1242/jeb.01573