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. 2020 Aug 24;10:14124. doi: 10.1038/s41598-020-70971-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Transmission electron micrographs of the surface of the myotendinous junction reveal the sarcoplasmatic evaginations (arrows) interacting with the sarcoplasmatic invaginations (arrowheads) of the Sedentary (A), Calisthenic (B) and Resistance (C) groups. Scale Bar: 1 μm. Magnifications: 80,000× (A–C). (D) Means ± SD of basal lamina (*) thickness *(p < 0.0001). (E) Means ± SD of the lengths of the sarcoplasmatic invaginations and evaginations *(p < 0.0001), **(p < 0.001), ***(p < 0.01). (F) Means ± SD of invagination and sarcoplasmatic evagination thickness *(p < 0.0001), **(p < 0.001). Transmission micrograph identifying the light bar on the MTJ and highlighting the diameter representation of collagen fiber in this region (circle). (G) Means ± SD of the support collagen thickness *(p < 0.0001). (H) Means ± SD of the collagen fibril diameter in the MTJ *(p < 0.0001), ***(p < 0.01). Support collagen/collagen fibrils. The micrographs show the definition of the thickness of the support of the collagen fibrils layer adjacent to the MTJ and prominently positioned lengthwise in the layer of support where it was possible to measure its diameter.