TABLE I.

Summary of the Values of Passive Force, Maximal Active Force, pCa₅₀, ΔpCa₅₀, and n_H in Control PLV, sTn-reconstituted PLV, and Control Rabbit Psoas Muscles

	SL	Passive force	Maximal force	pCa50	ΔpCa50	nH
	μm	mN/mm2	mN/mm2
Fig. 1 C
PLV	1.9	∼0	54.89 ± 2.24	5.56 ± 0.01		3.83 ± 0.20
	2.3	10.11 ± 0.53	70.25 ± 3.87	5.81 ± 0.02	0.24 ± 0.01	3.11 ± 0.29
PLV (+sTn)	1.9	∼0	51.43 ± 2.07 (54.36 ± 2.80)	5.79 ± 0.01a		3.20 ± 0.20
	2.3	10.23 ± 0.82	58.26 ± 3.58a	5.93 ± 0.02a	0.14 ± 0.02a	3.01 ± 0.10
Rabbit psoas	1.9	∼0	161.72 ± 8.91a b	5.89 ± 0.03a b		4.14 ± 0.22
	2.3	3.80 ± 0.76a b	178.68 ± 8.74a b	6.01 ± 0.02a b	0.12 ± 0.01a	3.40 ± 0.27
Control experiments
PLV (+cTn)	1.9	∼0	50.70 ± 3.15 (54.17 ± 4.50)	5.60 ± 0.01		3.28 ± 0.11
	2.3	7.90 ± 2.57	67.73 ± 3.70	5.82 ± 0.05	0.23 ± 0.04	2.60 ± 0.11
Rabbit psoas (+sTn)	1.9	∼0	129.40 ± 14.02 (129.35 ± 10.96)	5.86 ± 0.03		4.21 ± 0.31
	2.3	3.53 ± 0.52	152.58 ± 17.78	5.97 ± 0.04	0.11 ± 0.01	4.42 ± 0.55

Passive force was obtained at the steady state. PLV (+sTn), sTn-reconstituted PLV. Control experiments, muscles treated with the Tn complex identical to the endogenous one (see text). PLV (+cTn), cTn-reconstituted PLV (n = 5); Rabbit psoas (+sTn), sTn-reconstituted rabbit psoas muscle (n = 6). (P > 0.05 compared with corresponding values for original muscles, except for n_H at SL 1.9 μm in PLV [+cTn]). Maximal force was obtained by activating muscle at pCa 4.5 prior to construction of the force–pCa curve at each SL (passive force was measured just prior to activation at pCa 4.5). Numbers in parentheses indicate maximal force values obtained prior to reconstitution (P > 0.05 compared with corresponding values obtained after reconstitution).

^aP < 0.05 compared with corresponding values for control PLV.

^bP < 0.05 compared with corresponding values for sTn-reconstituted PLV.