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.
