The s.d. of the SLdis (s.d.dis) calculated during the experiments. The s.d.dis increased from the rest to activation, but it did not change throughout contractions and it was not significantly different among conditions. All results are means ± s.e.m. Filled circle, ADP-SHO; open circle, ADP-STR; filled inverted triangle, Ca2+-SHO; open triangle, Ca2+-STR.