Muscle Regionalization

1998 ◽  
Vol 23 (1) ◽  
pp. 1-22 ◽  
Author(s):  
Daniel Kernell
Keyword(s):  
Early Development ◽  
Fibre Type ◽  
Fiber Type ◽  
Motor Task ◽  
Motor Units ◽  
Metabolic Enzyme ◽  
Fibre Type Composition ◽  
Single Motor Units ◽  
Key Words Skeletal Muscle ◽  
Type Composition

In this review, the term muscle fibre regionalization signifies the presence of regional intramuscular differences in fibre type composition. As is well known, highly regionalized muscles commonly have greater concentrations of slow fibres deep than superficially. However, the degree of regionalization varies markedly between muscles and is not confined to deep vs. superficial locations. Fibres of the same myosin type may show regionalized differences in their metabolic enzyme activity, even within single motor units (Larsson, 1992). Regionalization of fibre type composition occurs also within single neuromuscular partitions. The intraspinal position of motoneurones is often coarsely related to the intramuscular sites of their muscle units. Muscles with a marked fibre type regionalization tend to show a corresponding regionalization of activity; in several muscles, however, the activity regionalization may vary depending on the motor task. During early development, fibre type regionalization emerges even under aneural conditions. The mechanisms are still unknown; relevant aspects of early development are briefly reviewed. Key words: skeletal muscle, fiber type, topography, activity, development

MUSCLES WITHIN MUSCLES: A MECHANOMYOGRAPHIC ANALYSIS OF MUSCLE SEGMENT CONTRACTILE PROPERTIES WITHIN HUMAN GLUTEUS MAXIMUS

2006 ◽  
Vol 10 (01) ◽  
pp. 23-35 ◽  
Author(s):  
D. McAndrew ◽  
M. Gorelick ◽  
J. M. M. Brown
Keyword(s):  
Fibre Type ◽  
Lateral Displacement ◽  
Gluteus Maximus ◽  
Motor Units ◽  
Isometric Tension ◽  
Contractile Properties ◽  
Laser Sensor ◽  
Contraction Time ◽  
Fibre Type Composition ◽  
Type Composition

The aim of this investigation was to determine the contractile properties of motor units within 3 segments of the gluteus maximus utilizing a laser-based mechanomyographic (MMG) technique. The intention was to determine whether there were segmental differences in motor unit contractile properties and whether these differences may be related to the muscle segment's function and its fibre type composition. Ten subjects were recruited from the student population at the University of Wollongong. Maximal percutaneous neuromuscular stimulation (PNS) was delivered to the medial and lateral portions of three (cranial, middle, caudal) muscle segments of the gluteus maximus by an MMG stimulator. An MMG laser sensor measured the lateral displacement of the muscle segment belly resulting from the development of maximal isometric tension. Parameters characterizing the MMG waveforms were statistically compared to determine variations in contractile properties both within (medial to lateral) and between segments. Our results indicated that the contractile properties of motor units varied significantly (p < 0.05) between, but not within (medial to lateral), the three segments of the gluteus maximus. Most the gluteus maximus. Most notably, segment contraction time (t c ) decreased significantly (p < 0.05) in a cranio to caudal direction suggesting a variation in muscle fibre type composition within the three segments of the muscle. Even when corrected for differences in muscle belly displacement between subjects, the cranial segment was found to have a significantly (p < 0.05) longer contraction time than the two more caudal segments. The results suggest that the gluteus maximus was composed of muscle segments that were physiologically, as well as anatomically, designed to fulfil particular roles during everyday motor tasks. Based upon these results, the MMG technique appears to have considerable utility for the non-invasive assessment of muscle segment contractile properties for both laboratory and clinical applications.

Muscle fibre type composition in young and racing Swedish cold-blooded trotters

2009 ◽  
Vol 6 (01) ◽  
pp. 27 ◽  
Author(s):  
Kristina Karlström ◽  
Arne Lindholm ◽  
Eje Collinder ◽  
Birgitta Essén-Gustavsson
Keyword(s):  
Muscle Fibre ◽  
Fibre Type ◽  
Muscle Fibre Type ◽  
Fibre Type Composition ◽  
Type Composition

The fibre type composition of the striated muscle of the oesophagus in ruminants and carnivores

1984 ◽  
Vol 80 (3) ◽  
pp. 277-288 ◽  
Author(s):  
F. Mascarello ◽  
A. Rowlerson ◽  
P. A. Scapolo
Keyword(s):  
Fibre Type ◽  
Striated Muscle ◽  
Fibre Type Composition ◽  
Type Composition

scholarly journals A comparison of pain responses, hemodynamic reactivity and fibre type composition between Bergström and microbiopsy skeletal muscle biopsies

2020 ◽  
Vol 3 ◽  
pp. 1-10
Author(s):  
Jacob T. Bonafiglia ◽  
Hashim Islam ◽  
Nicholas Preobrazenski ◽  
Patrick Drouin ◽  
Andrew Ma ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Fibre Type ◽  
Fibre Type Composition ◽  
Type Composition ◽  
Hemodynamic Reactivity ◽  
Muscle Biopsies ◽  
Pain Responses

scholarly journals Fibre type composition in the lumbar perivertebral muscles of primates: implications for the evolution of orthogrady in hominoids

2013 ◽  
Vol 224 (2) ◽  
pp. 113-131 ◽  
Author(s):  
J. Neufuss ◽  
B. Hesse ◽  
S. K. S. Thorpe ◽  
E. E. Vereecke ◽  
K. D'Aout ◽  
...  
Keyword(s):  
Fibre Type ◽  
Fibre Type Composition ◽  
Type Composition
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