. Author manuscript; available in PMC: 2010 Jul 15.

Published in final edited form as: Pflugers Arch. 2008 May 1;457(1):25–36. doi: 10.1007/s00424-008-0501-x

Table 1.

Sub-epicardial and sub-endocardial myocytes mechanical properties

Parameter	n	SL 1.9 μm				SL 2.3 μm
Parameter	n	T_pass mN/mm²	T_max mN/mm²	pCa₅₀	n_H	T_pass mN/mm²	T_max mN/mm²	pCa₅₀	n_H	ΔpCa₅₀
EPI	14	0.5±0.1	25±4	5.52±0.02	4.3±0.1	1.5±0.2^*	23±3	5.61±0.02^*	3.6±0.2^*	0.09±0.01
ENDO	14	0.6±0.1	22±2	5.56±0.02	3.5±0.1^**	2.4±0.2^,^*	20±1	5.75±0.03^,^*	4.3±0.3^,^*	0.19±0.01^**

Values are means±SEM. Passive (T_pass) and maximal active (T_max) tensions in mN/mm² were measured at pCa 9 and 4.5, respectively and at short and long sarcomere length (SL), on sub-epicardial (EPI), and sub-endocardial (ENDO). pCa₅₀, pCa for half-maximal activation and n_H, Hill coefficient were obtained by fitting the force–pCa relations. n is the number of cells

Significant difference from short SL (P<0.05).

^**

Significant difference from sub-epicardial cells (P<0.05).