Effects of adrenaline on contractility and endurance of isolated mammalian soleus with different calcium concentrations.

The β-adrenergic receptor stimulation improves endurance in fast twitch muscles and these effects are sensitive to extracellular Ca influx. Present study is aimed to determine the effects of adrenaline, with different concentrations of extracellular Ca[Formula: see text], on the contractility and endurance of slow twitch muscles during high frequency stimulations (HFS). Isolated soleus of rabbit was electrically stimulated (strength; 50 Hz, duration; 0.