https://doi.org/10.4081/ejh.2022.3356

Stretching prior to resistance training promotes adaptations on the postsynaptic region in different myofiber types

Vol. 66 No. 1 (2022)
Submitted: 29 October 2021
Accepted: 1 February 2022
Published: 15 February 2022
Neuromuscular junction, motor endplate, muscle hypertrophy, static stretching, resistance training
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Authors

Carolina dos Santos Jacob
https://orcid.org/0000-0002-7631-1679
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University, Rio Claro, Brazil.
Gabriela Klein Barbosa
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University, Rio Claro, Brazil.
Mariana Pasquini Rodrigues
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University, Rio Claro, Brazil.
Jurandyr Pimentel Neto
https://orcid.org/0000-0001-6503-2271
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University, Rio Claro, Brazil.
Lara Caetano Rocha
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University, Rio Claro, Brazil.
Adriano Polican Ciena
adriano.ciena@unesp.br
https://orcid.org/0000-0002-2912-3376
Laboratory of Morphology and Physical Activity (LAMAF), São Paulo State University, Rio Claro, Brazil.

The morphology of the neuromuscular junction adapts according to changes in its pattern of use, especially at the postsynaptic region according to the myofibrillar type and physical exercise. This investigation revealed the morphological adaptations of the postsynaptic region after static stretching, resistance training, and their association in adult male Wistar rats. We processed the soleus and plantaris muscles for histochemical (muscle fibers) and postsynaptic region imaging techniques. We observed muscle hypertrophy in both groups submitted to resistance training, even though the cross-section area is larger when there is no previous static stretching. The soleus postsynaptic region revealed higher compactness and fragmentation index in the combined exercise. The resistance training promoted higher adaptations in the postsynaptic area of plantaris; moreover, the previous static stretching decreased this area. In conclusion, the neuromuscular system’s components responded according to the myofiber type even though it is the same physical exercise. Besides, static stretching (isolated or combined) plays a crucial role in neuromuscular adaptations.

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Supporting Agencies

This work was supported by Grant #2017/12525-1, São Paulo Research Foundation (FAPESP), in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior — Brasil (CAPES) — Financing Code 001, and UNESP -PROPG Edital 19/2021.

How to Cite

Jacob, C. dos S. ., Barbosa, G. K., Rodrigues, M. P. ., Pimentel Neto, J. ., Rocha, L. C. ., & Ciena, A. P. (2022). Stretching prior to resistance training promotes adaptations on the postsynaptic region in different myofiber types. European Journal of Histochemistry, 66(1). https://doi.org/10.4081/ejh.2022.3356
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