Table 1.

Estimates of dynamic contractile parameters from α- and β-MHC–containing fibers reconstituted with RcTnT_1–43Δ and RcTnT_44–73Δ

Dynamic contractile parameters	RcTnTWT	RcTnT1–43Δ	RcTnT44–73Δ
α-MHC
b (s−1)	18.14 ± 0.62	18.38 ± 1.10	17.46 ± 0.43
ktr (s−1)	7.32 ± 0.17	7.25 ± 0.31	6.79 ± 0.29
c (s−1)	21.41 ± 0.83	20.60 ± 1.53	20.14 ± 0.07
β-MHC
b (s−1)	7.55 ± 0.34a	7.84 ± 0.17a	7.53 ± 0.22a
ktr (s−1)	4.15 ± 0.11a	4.38 ± 0.08a	4.40 ± 0.11a
c (s−1)	10.72 ± 0.40a	10.70 ± 0.35a	11.68 ± 0.30a

The SL of the muscle fiber was set to 2.3 µm. b and c were estimated as described previously (Ford et al., 2010). k_tr was estimated using a rapid slack/restretch protocol (Brenner and Eisenberg, 1986). Number of determinations was at least 11 for each group. Values are reported as mean ± SEM.

^aP < 0.001 when compared to the corresponding groups in α-MHC fibers.