NDLI: Non-uniform Distribution of Strain during Stretch of Relaxed Skeletal Muscle Fibers from Rat Soleus Muscle

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Non-uniform Distribution of Strain during Stretch of Relaxed Skeletal Muscle Fibers from Rat Soleus Muscle

Content Provider	PubMed Central
Author	Palmer, Mark L. Claflin, Dennis R. Faulkner, John A. Panchangam, Appaji
Abstract	Tension and regional average sarcomere length (Ls) behavior were examined during repeated stretches of single, permeabilized, relaxed muscle fibers isolated from the soleus muscles of rats. We tested the hypothesis that during stretches of single permeabilized fibers, the global fiber strain is distributed non-uniformly along the length of a relaxed fiber in a repeatable pattern. Each fiber was subjected to eight constant-velocity stretch and release cycles with a strain of 32% and strain rate of 54% s−1. Stretch-release cycles were separated by a 4.5 minute interval. Throughout each stretch-release cycle, sarcomere lengths were measured using a laser diffraction technique in which 20 contiguous sectors along the entire length of a fiber segment were scanned within 2 ms. The results revealed that: (1) the imposed length change was not distributed uniformly along the fiber, (2) the first stretch-release cycle differed from subsequent cycles in passive tension and in the distribution of global fiber strain, and (3) a characteristic “signature” for the Ls response emerged after cycle 3. The findings support the conclusions that longitudinal heterogeneity exists in the passive stiffness of individual muscle fibers and that preconditioning of fibers with stretch-release cycles produces a stable pattern of sarcomere strains.
Related Links	http://dx.doi.org/10.1007/s10974-011-9250-0
Ending Page	48
Page Count	10
Starting Page	39
File Format	PDF
ISSN	01424319
e-ISSN	15732657
Journal	Journal of muscle research and cell motility
Issue Number	1
Volume Number	32
Language	English
Publisher Date	2011-08-01
Access Restriction	Open
Subject Keyword	Cell Biology Biochemistry Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Physiology Biochemistry

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Non-uniform distribution of strain during stretch of relaxed skeletal muscle fibers from rat soleus muscle

Role of muscle progenitor cells in maintaining morphological characteristics of rat soleus muscle during gravitational unloading by means of passive stretch

Essential role of satellite cells in the growth of rat soleus muscle fibers.

Effects of blebbistatin and Ca2+ concentration on force produced during stretch of skeletal muscle fibers.

Effect of salbutamol on innervated and denervated rat soleus muscle

Heat stress increases myonuclear number and fiber size via satellite cell activation in rat regenerating soleus fibers.

Prolonged passive stretch of rat soleus muscle provokes an increase in the mRNA levels of the muscle regulatory factors distributed along the entire length of the fibers

Role(s) of gravitational loading during developing period on the growth of rat soleus muscle fibers.

Macrophage deficiency in osteopetrotic (op/op) mice inhibits activation of satellite cells and prevents hypertrophy in single soleus fibers.

Non-uniform Distribution of Strain during Stretch of Relaxed Skeletal Muscle Fibers from Rat Soleus Muscle

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Non-uniform distribution of strain during stretch of relaxed skeletal muscle fibers from rat soleus muscle

Role of muscle progenitor cells in maintaining morphological characteristics of rat soleus muscle during gravitational unloading by means of passive stretch

Essential role of satellite cells in the growth of rat soleus muscle fibers.

Effects of blebbistatin and Ca2+ concentration on force produced during stretch of skeletal muscle fibers.

Effect of salbutamol on innervated and denervated rat soleus muscle

Heat stress increases myonuclear number and fiber size via satellite cell activation in rat regenerating soleus fibers.

Prolonged passive stretch of rat soleus muscle provokes an increase in the mRNA levels of the muscle regulatory factors distributed along the entire length of the fibers

Role(s) of gravitational loading during developing period on the growth of rat soleus muscle fibers.

Macrophage deficiency in osteopetrotic (op/op) mice inhibits activation of satellite cells and prevents hypertrophy in single soleus fibers.

Non-uniform Distribution of Strain during Stretch of Relaxed Skeletal Muscle Fibers from Rat Soleus Muscle