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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: MICROSCOPY RESEARCH AND TECHNIQUE; v. 83, n. 10 JUN 2020.
• Citações Web of Science: 1

Resumo

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)

• Processo FAPESP: 17/21977-3 - Adaptações nos comprimentos dos sarcômeros na região da junção miotendínea do músculo plantar associado ao exercício físico
• Beneficiário: Jurandyr Pimentel Neto
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 18/09199-8 - Adaptações na interface miotendínea de ratos Wistar após treinamento resistido - análises: morfológica, bioquímica e funcional
• Beneficiário: Gustavo Crivelli
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica