Table 1.

Effect of MHC composition on steady-state mechanical properties of rat myocardium

%α MHC	n	Fmin (mN mm−2)	Fmax (mN mm−2)	pCa50	nH
0	10	0.8 ± 0.3	22.1 ± 1.3	5.80 ± 0.01	4.24 ± 0.28
100	10	0.7 ± 0.2	20.5 ± 1.1	5.78 ± 0.01	4.11 ± 0.25

Data are means ±s.e.m.n, number of cardiac preparations; F_min, Ca²⁺-independent force at pCa 9.0; F_max, maximal Ca²⁺-activated force at pCa 4.5; pCa₅₀, pCa required for half-maximal force generation; n_H, Hill coefficient for total force–pCa relationship.