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. 2006 Oct;128(4):461–471. doi: 10.1085/jgp.200609634

TABLE I.

Effects of SL on Steady-state Force in Murine Myocardium

Sarcomere length Fmax Fmin pCa50 nH
μm mN/mm2 mN/mm2
1.90 15.0 ± 0.9 0.5 ± 0.2 5.71 ± 0.01 3.95 ± 0.29
2.25 21.1 ± 1.3a 1.1 ± 0.3a 5.81 ± 0.01a 3.62 ± 0.26

Data are means ± SEM, from 10 preparations. Fmax, maximum Ca2+-activated force at pCa 4.5; Fmin, Ca2+-independent force at pCa 9.0; pCa50, pCa at half-maximal force; n H, Hill coefficient.

a

Significantly different from data obtained at SL of 1.90 μm, P < 0.05.