Fig. 2From: The effect of a physiological concentration of caffeine on the endurance of maximally and submaximally stimulated mouse soleus muscleTypical effects of fatigue on work loop shape for control soleus stimulated at 140 and 40 Hz (a and c, respectively) compared with those treated with 70 μM caffeine (b 140 Hz caffeine, d 40 Hz caffeine) (arrows indicate where stimulation typically started, towards the end of lengthening, and finished, during shortening; 0.4s, 2.4s, 4.8s and 7.2s represent time since the start of the fatigue protocol)Back to article page