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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Repercussions on sarcomeres of the myotendinous junction and the myofibrillar type adaptations in response to different trainings on vertical ladder

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Author(s):
Rocha, Lara Caetano [1] ; Pimentel Neto, Jurandyr [1] ; de Sant'Ana, Jossei Soares [1] ; Jacob, Carolina dos Santos [1] ; Barbosa, Gabriela Klein [1] ; Krause Neto, Walter [2] ; Watanabe, Ii-sei [3] ; Ciena, Adriano Polican [1]
Total Authors: 8
Affiliation:
[1] Sao Paulo State Univ UNESP, Inst Biosci, Lab Morphol & Phys Act LAMAF, Rio Claro - Brazil
[2] Univ Sao Judas Tadeu, Dept Phys Educ, Lab Morphoquantitat Studies & Immunohistochem, Sao Paulo - Brazil
[3] Univ Sao Paulo, Inst Biomed Sci 3, Dept Anat, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: MICROSCOPY RESEARCH AND TECHNIQUE; v. 83, n. 10 JUN 2020.
Web of Science Citations: 1
Abstract

The myofibrillary types establish to the skeletal muscle functional and adaptive properties that influence the sarcomeric arrangement during muscle contraction and may have repercussions on an important related force transmission region of the locomotor apparatus, the myotendinous junction (MTJ). This study aimed to describe changes in myofibrillary type and sarcomeric lengths in the belly muscle and MTJ of the soleus and plantaris muscles associated with training protocols in vertical ladder. Thirty adults male Wistar rats were divided into three groups (n = 10): Control (CTR), No-load Training (NLT), and Load Training (LT). Morphoquantitative analysis of different fibers types and sarcomere lengths were performed in distinct regions of plantaris and soleus muscles. In the plantaris muscle with both trainings, there was an increase in the cross-sectional area (CSA) in Type I and II fibers (p < .0001) while sarcomeric lengths revealed greater lengths in the proximal and distal sarcomeres of NLT, although in the LT we found greater lengths in the belly and MTJ sarcomeres. The soleus muscle showed an increase in CSA muscle fiber only in the NLT (p < .0001) and revealed alterations in belly and MTJ sarcomere lengths with training. We concluded that plantaris muscle has an adaptive effect directly associated with training load, with hypertrophy in both trainings and sarcomere length inverse from belly and MTJ, in LT associated with increased force generation and transmission at the MTJ, although soleus muscle has a lower adaptive response to training stimuli with variation in the belly and distal sarcomere of the MTJ. (AU)

FAPESP's process: 17/21977-3 - Adaptations to the lengths of the sarcomeres in the region of the myotendinous junction of the plantar muscle associated to physical exercise
Grantee:Jurandyr Pimentel Neto
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 18/09199-8 - Adaptations in the myotendinous interface of wistar rats after resisted training - morphological, biochemical and functional analysis
Grantee:Gustavo Crivelli
Support Opportunities: Scholarships in Brazil - Scientific Initiation