Fig. 3. Force redevelopment recorded during tetanic stimulation. For clarity, the time at which the trace starts has been adjusted to the end of the length step. The bottom trace was obtained in 2 mm extracellular [Ca²⁺]. The upper trace was obtained in 12 mm extracellular [Ca²⁺]. The middle trace was obtained in 12 mm extracellular [Ca²⁺] plus 1 MAC isoflurane.