Table 3. Histochemical properties of the plantaris and soleus muscles (n = 8 for each muscle except for the SIT in the plantaris muscle [n = 7]) in the control (CON) and the sprint-interval training (SIT) groups. The number of samples of the SIT group in the plantaris was seven since one sample was not in good condition of freezing. Values are means (± SD). Muscle Group Fiber type composition (%) Fiber cross sectional area (μm2) I IIA IIB I IIA IIB Plantaris CON 11.2 (1.3) 22.6 (3.6) 66.2 (3.8) 1484 (138) 1363 (114) 2623 (229) SIT 11.2 (2.3) 30.2 (4.3)* 58.6. (3.3)* 1488 (191) 1537 (152)* 2694 (265) Soleus CON 85.1 (5.7) 14.9 (5.7) — 2248 (245) 2002 (272) — SIT 83.3 (3.9) 16.6 (3.9) — 2238 (215) 1891 (271) — * p < 0.05 significantly different from the CON group.