Effects of sTn reconstitution on force redevelopment in PLV. (A) Chart recording showing active force redevelopment in control (left) and sTn-reconstituted (right) PLV at similar activation levels. P₀, maximal force. SL 1.9 μm. (B, left) k_tr–pCa (dashed lines) and force-pCa (solid lines) curves obtained from the same preparations (control, n = 8; sTn, n = 9). Maximal force was 46.97 ± 2.60 and 43.16 ± 2.38 (48.33 ± 3.51) mN/mm² in control and sTn-reconstituted PLV (P > 0.05), respectively (values in parentheses indicate maximal force before sTn reconstitution; P > 0.05). n_H was 3.19 ± 0.22 and 3.38 ± 0.23 (P > 0.05) in control and sTn-reconstituted PLV, respectively. Maximal k_tr was 0.94 ± 0.07 and 0.89 ± 0.04 (0.89 ± 0.06) s⁻¹ in control and sTn-reconstituted PLV (P > 0.05), respectively (values in parentheses indicate k_tr before sTn reconstitution; P > 0.05). n_H was 1.78 ± 0.06 and 1.72 ± 0.12 (P > 0.05) in control and sTn-reconstituted PLV, respectively. (B, right) Summary of the midpoints of the curves. *, P < 0.05, compared with the corresponding control values. ^#, P < 0.05, compared with the corresponding force values. (C) Force–k_tr relationship in control and sTn-reconstituted PLV. Statistical tests were done for points with insignificant X values. *, P < 0.05.