Table 2.

Mechanical parameters from trabeculae at MI20W and AMC20W

	AMC20W at 32 μM (n = 12)	MI20W at 32 μM (n = 8)	AMC20W at 1 μM (n = 9)	MI20W at 1 μM (n = 8)
F0, kN/m2	66 ± 6	62 ± 9	30 ± 3*	22 ± 3*
Vmax, ML/s	7.2 ± 0.6	4.8 ± 0.4†‡	2.1 ± 0.2*	2.4 ± 0.8*†
VPP, ML/s	1.2 ± 0.1	0.8 ± 0.1‡	0.7 ± 0.1*	0.7 ± 0.2*
PP, kW/m3	14 ± 6.8	7.5 ± 1.4†	5.9 ± 0.5*	4.2 ± 0.6*†
a/P0	0.05 ± 0.01	0.05 ± 0.08	0.39 ± 0.11*	0.32 ± 0.11*
FPP, kN/m2	12 ± 1.4	9.5 ± 1.4†	9.4 ± 0.8*	6.3 ± 1.0*†
FPP/F0	0.18 ± 0.01	0.16 ± 0.01	0.32 ± 0.01*	0.29 ± 0.02*
CSA, μm2	12600 ± 2250	10700 ± 2380	20600 ± 2590	32000 ± 4710

Values are means ± SE. Mechanical parameters for MI20W and ACM20W trabeculae are tabulated. F₀, peak isometric force; V_max, peak unloaded shortening velocity; V_PP, velocity at which peak power is attained, PP is the peak power; a/P_o, curvature of the hyperbolic fit of the force-velocity data; F_PP is the force at peak power; F_PP/P_o; ratio of force at peak isometric force; CSA, cross-sectional area of the trabeculae; ML, muscle length.

^*P < 0.05, significant [Ca²⁺] effect.

^†P < 0.05, significant effect of myocardial infarction (MI).

^‡P < 0.05, interaction effect between [Ca²⁺] and MI.