Table 2.

In vitro force data (in grams) under control conditions and after BaCl₂, ouabain or DAP exposure at each stimulus frequency tested

Stimulus freq. (Hz)	DAP control‡	DAP	BaCl2 control‡	BaCl2	Ouabain control‡	Ouabain
4	0.8 ± 0.1	1.2 ± 0.3*	2.0 ± 0.2	1.5 ± 0.3	1.4 ± 0.3	0.9 ± 0.1
10	1.2 ± 0.2	1.9 ± 0.5*	3.4 ± 0.4	2.0 ± 0.6*	2.6 ± 0. 6	1.6 ± 0.3*
20	2.8 ± 0.4	4.0 ± 1.2	5.9 ± 0.5	3.1 ± 0.8*	3.9 ± 0.7	2.2 ± 0.4*
30	3.6 ± 0.5	4.6 ± 1.3	6.6 ± 0.5	3.5 ± 1. 0*	4.9 ± 0.9	2.6 ± 0.4*
40	4.2 ± 0.5	4.9 ± 1.3	7.3 ± 0.4	4.5 ± 1.3*	5.4 ± 1.0	3.3 ± 0.6*
60	4.7 ± 0.6	5.2 ± 1.3	7.9 ± 0.6	4.7 ± 1.3*	5.5 ± 1.0	2.9 ± 0.4*
80	4.6 ± 0.7	4.9 ± 1.3	7.7 ± 0.5	4.8 ± 1.3*	5.5 ± 1.1	3.4 ± 0.6*

^‡Time and animal matched controls.

^*Significant difference from the time and animal matched controls.