Table 2. Enzyme activities of the plantaris and soleus muscles (n = 8 for each muscle) in the control (CON) and the sprint-interval training (SIT) groups. Values are means (± SD). Muscle Group Enzyme activity (nmol·min-1·mg protein-1) Hexokinase Phosphofructokinase Citrate synthase Plantaris CON 20.3 (1.7) 303 (43) 191–(8) SIT 26.1 (3.5) * 382 (38) * 276 (24) * Soleus CON 35.8 (3.6) 118 (25) 323 (23) SIT 35.7 (2.5) 135 (22) 342 (24) * p < 0.05 significantly different from the CON group.