Fig. 3

(a) Schematic diagram of histopathological changes in the damaged biceps femoris on days 2, 4 and 7 after modeling in different groups [note: yellow arrow monocyte, black arrow myocyte, scale = 100 μm (1:200)]. The monocytes were indicated by the yellow arrow, the new myocytes were indicated by the black arrow. Scale bar = 100 μm, magnification ×200. (b) The number of monocytes. (compared with the day 2, *p < 0.05; compared with day 4, #p < 0.05; compared with control group, &p < 0.05; compared with 10 Hz group, Δp < 0.05). (c) The number of myocytes. (compared with day 2,*p < 0.05; compared with day 4, #p < 0.05; compared with control group, &p < 0.05; compared with 10 Hz group, Δp < 0.05).