Figure 10. Residual force changes after MgADP treatment.

(A) Sample records recorded during a typical experiment in a fibre activated in pCa²⁺4.5 with 10 mM MgADP. Black: isometric contraction at SL of 2.8 µm. Red: isometric contraction at SL of 2.65 µm followed by a 5% length stretch. Blue: isometric contraction at SL 2.95 µm followed by a 5% length shortening. Lower panel: correspondent fibre length changes. (B) Mean (± S.E.M.) forces produced by fibres (n = 7) activated in pCa²⁺4.5 and pCa²⁺4.5+10 mM MgADP during isometric contractions (black bar), after shortening (light grey bar) and after stretch (dark grey bar). P = forces 10 s after length changes. P_iso = force produced during the respective isometric condition. * significantly different from isometric, ^# significantly different from shortening.