TABLE 1.

Active tension and stiffness of thin filament reconstituted fibers at 25°C

Parameters	Actin-filament	Acetyl-Tm	AS-Tm	AS-Δ23Tm
Tension	0.96 ± 0.04	1.82 ± 0.30*	1.85 ± 0.15*	0.66 ± 0.06†‡
Stiffness	55 ± 5	100 ± 17*	83 ± 8	43 ± 2†‡
Ratio %L0	1.89 ± 0.19	1.84 ± 0.14	2.30 ± 0.12†	1.51 ± 0.11‡
N	9	10	10	11

Tension and stiffness (Y_∞, Eq. 2) are measured in the standard activating solution and normalized to T_ac (actin reconstituted tension), and compared among different muscle groups.

^*P < 0.05 compared with actin-filament.

^†P < 0.05 compared with acetyl-Tm.

^‡P < 0.05 compared with AS-Tm.