Figure 6. Effects of temperature, 10 mM L-lactic acid and 10⁻⁵ M salbutamol on tetanic force at 11 mM K⁺.

Soleus muscles were stimulated every 10 min using 0.2 ms pulses of 12 V at 90 Hz for 2 s. •, 4 mM K⁺ throughout; ▪, 11 mM K⁺ with stepwise addition of 10 mM L-lactic acid and 10⁻⁵ M salbutamol after temperature elevation; ▵, 11 mM K⁺ with addition of L-lactic acid and salbutamol occurring simultaneously with temperature elevation. Each point indicates the mean of 6-12 muscles with error bars showing S.E.M.