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M3 meridional reflection spacing changes as a function of active (A) and titin-based passive tension (B). In active muscle, the M3 spacing changes from both EDL (solid circles) and soleus muscle (open circles) as a function of tetanic tensions. The fit to a Hill model is shown (heavy line) along with 95% confidence levels (dotted lines) (b). M3 spacing as a function of passive tension in EDL muscle. The M3 spacing did not increase with an increase in passive tension.
