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Myosin Isoforms and Contractile Properties of Single Fibers of Human Latissimus Dorsi Muscle
Joint Authors
Reggiani, Carlo
Canato, M.
Pacelli, Quirico F.
Cancellara, Pasqua
Toniolo, Luana
Moro, Tatiana
Miotti, Danilo
Paoli, Antonio
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-07-22
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
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 only 33%.
The unbalance toward fast isoforms was even greater in males (71%) than in females (64%).
Fiber type distribution partially reflected MyHC isoform distribution with 28% type 1/slow fibers and 5% hybrid 1/2A fibers, while fast fibers were divided into 30% type 2A, 31% type A/X, 4% type X, and 2% type 1/2X.
Type 1/slow fibers were not only less abundant but also smaller in cross-sectional area than fast fibers.
During maximal isometric contraction, type 1/slow fibers developed force and tension significantly lower than the two major groups of fast fibers.
In conclusion, the predominance of fast fibers and their greater size and strength compared to slow fibers reveal that LDM is a muscle specialized mainly in phasic and powerful activity.
Importantly, such specialization is more pronounced in males than in females.
American Psychological Association (APA)
Paoli, Antonio& Pacelli, Quirico F.& Cancellara, Pasqua& Toniolo, Luana& Moro, Tatiana& Canato, M.…[et al.]. 2013. Myosin Isoforms and Contractile Properties of Single Fibers of Human Latissimus Dorsi Muscle. BioMed Research International،Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-1030230
Modern Language Association (MLA)
Paoli, Antonio…[et al.]. Myosin Isoforms and Contractile Properties of Single Fibers of Human Latissimus Dorsi Muscle. BioMed Research International No. 2013 (2013), pp.1-7.
https://search.emarefa.net/detail/BIM-1030230
American Medical Association (AMA)
Paoli, Antonio& Pacelli, Quirico F.& Cancellara, Pasqua& Toniolo, Luana& Moro, Tatiana& Canato, M.…[et al.]. Myosin Isoforms and Contractile Properties of Single Fibers of Human Latissimus Dorsi Muscle. BioMed Research International. 2013. Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-1030230
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1030230