Figure 3. Effect of temperature on tetanic force at 4 and 11 mM K⁺ in rat EDL muscles.

Muscles were stimulated every 20 min using 0.2 ms pulses of 12 V at 90 Hz for 0.5 s. •, 4 mM K⁺ throughout, n = 5; error bars show S.E.M. ▵, [K⁺]_o changed from 4 to 11 mM K⁺ after 60 min, n = 6; error bars show S.E.M.