Figure 2. Tetanic [Ca²⁺]_i signals are similar in mouse fast-twitch FDB and slow-twitch soleus muscle fibres.

Fibres were in both cases stimulated with electrical pulses at 70 Hz for 500 ms and [Ca²⁺]_i was measured with indo-1. Data from the FDB fibre included in Aydin et al. (2009) and the soleus fibre record adapted from Bruton et al. (2003).