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. 2022 May 5;12:7375. doi: 10.1038/s41598-022-10801-z

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© The Author(s) 2022

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Histological sections of rat rectus abdominis muscle (RAM), obtained from CellSens Dimension (Olympus Corporation®) Version 1.16 image analysis software—(https://www.olympus-lifescience.com/en/software/cellsens/). (A) RAM samples were taken from non-diabetic sedentary (NDsed), non-diabetic exercised (NDex), diabetic sedentary (Dsed) and diabetic exercised (Dex) rats as described in “Materials and methods”. RAM samples were stained with picrosirius red and immunohistochemistry against myosin heavy chain of slow and fast RAM fibers. (B) Picrosirius red staining for total muscle area, fiber area, and fiber diameter in RAM samples as in (A). (C) Immunohistochemistry for total slow-twitch fiber area,slow-twitch fiber area, and slow-twitch fiber diameter as in (A). (D) Immunohistochemistry for total fast-twitch fiber area,fast-twitch fiber area, and fast-twitch fiber diameter as in (A). Values are means ± S.D. (n = 5 animals/group. *p < 0.05, **p < 0.01, ***p < 0.001 and ****p < 0.0001. Scale bar: 50 µm. Magnification: ×20.