Figure 9. Examples of experiments repeated to synchronize SLs between tests for a skeletal psoas myofibril (A) and a cardiac papillary myofibril (B).

The SL plots are annotated with letters a–e with the synchronization SL (c) denoting the period when all forces were compared. Test 5‐I (red) synchronized with Test 4 at ‘c’, unlike Test 5‐II (green). ‘R’ and ‘A’ indicate the use of relaxation solution and activation solution, respectively. Note that the micro‐needle input at ‘e’ was increased to synchronize the SLs.