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. 2021 Aug 14;121(11):3161–3172. doi: 10.1007/s00421-021-04768-4

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© The Author(s) 2021

Open AccessThis 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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Fig. 3 — a Shows fibre type composition in the m. vastus lateralis from young and old highly resistance-trained men pre- and post-endurance exercise. b Shows fibre cross-sectional area (FCSA) for type I and type II fibres pre- and post-endurance exercise in young and old highly resistance-trained men. c Shows succinate dehydrogenase (SDH) staining optical density for type I and type II fibres pre- and post-endurance exercise in young and old participants. d Shows the capillaries around fibres (CAF) for type I and II fibres pre- and post-endurance exercise in young and old participants. *Indicates a training effect at p ≤ 0.043; ^yindicates a significant difference compared to young subjects at p ≤ 0.028; ^Iindicates a significant difference compared to type I fibres at p ≤ 0.041