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. 2021 Oct 27;54(5):167–175. doi: 10.1267/ahc.21-00057

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2021 The Japan Society of Histochemistry and Cytochemistry

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Fig. 1. — Succinate dehydrogenase (SDH) activity and fiber cross-sectional area (FCSA). Serial cross sections of the soleus muscles of Aged Ex (−) (A and C) and Aged Ex (+) (B and D) rats were stained with SDH (A and B) and myofibrillar adenosine triphosphate (ATPase) (C and D) stains (×20). Bar = 25 μm. SDH activity of type I fiber (E), type II fiber (F), and FCSA of type I (G) and type II fiber (H) were measured in Aged Ex (−) (n = 5) and Aged Ex (+) (n = 4) rats using the stained images. Upregulation or downregulation of the SDH activity of type I and type II fiber was calculated as the rate of change compared to the values in Aged Ex (−). **p < 0.01 vs. Aged Ex (−); n.s.: not significant. Data are shown as mean ± standard error of the mean (SEM).