Table 1.

Summary of passive tension, maximal Ca²⁺-activated tension, pCa₅₀ and n_H under various conditions

		SL (μm)	Passive tension (mN mm−2)	Maximal tension (mN mm−2)	PCa50	nH
Fig. 2A (control)	BLV(n = 8)	1.9	˜0	21.36 ± 2.18	5.65 ± 0.01	3.66 ± 0.34
		2.4	6.71 ± 0.42*	39.57 ± 3.10*	5.88 ± 0.03*	3.77 ± 0.13
	BLA (n = 8)	1.9	˜0	17.61 ± 1.17	5.61 ± 0.02	3.50 ± 0.36
		2.4	3.50 ± 0.24	27.08 ± 2.69	5.74 ± 0.02	3.36 ± 0.26
Fig. 2B (high PT)	BLV(n = 6)	1.9	˜0	24.75 ± 2.05	5.65 ± 0.03	4.98 ± 0.53
		2.4	9.22 ± 0.62†	48.94 ± 3.20†	5.98 ± 0.04†	4.13 ± 0.38
Fig. 2C (high PT)	BLA (n = 5)	1.9	˜0	21.05 ± 1.24	5.62 ± 0.01	4.30 ± 0.30
		2.4	6.80 ± 0.41†	35.84 ± 2.45†	5.84 ± 0.02†	3.49 ± 0.12

Maximal tension was obtained by activating muscle at pCa 4.5 prior to construction of the pCa–tension relationship at each SL (passive tension, just prior to pCa 4.5 activation). High PT, high passive tension.

^*P < 0.05 compared with corresponding values for BLA.

^†P < 0.05 compared with corresponding values obtained in experiments under the control condition (Fig. 2A).