Table 1. At 10 mM K , mean resting E M... | Rockefeller University Press

Table 1.

At 10 mM K⁺, mean resting E_M of unexcitable fibers was less negative for HyperKPP soleus fibers than wild type fibers

[Ca²⁺]_e (mM)	[Mg²⁺]_e (mM)	Wild type soleus	HyperKPP soleus
2.4	3.1	−63.6 ± 1.3 (38/11)	−56.1 ± 1.2 (37/6)^a
0.3	3.1	−61.7 ± 2.2 (62/8)	−55.1 ± 1.8 (75/6)^a
0.3	5.2	−59.4 ± 1.3 (54/6)	−56.4 ± 1.1 (98/6)^a

[Ca²⁺]_e (mM)	[Mg²⁺]_e (mM)	Wild type soleus	HyperKPP soleus
2.4	3.1	−63.6 ± 1.3 (38/11)	−56.1 ± 1.2 (37/6)^a
0.3	3.1	−61.7 ± 2.2 (62/8)	−55.1 ± 1.8 (75/6)^a
0.3	5.2	−59.4 ± 1.3 (54/6)	−56.4 ± 1.1 (98/6)^a

Unexcitable fibers were fibers that did not generate an action potential upon stimulation. Mean resting E_M values are expressed as mean ± SE (number of fibers/number of muscle). There was no significant effect of 5 µM salbutamol on mean resting E_M of unexcitable fibers at 10 mM K⁺ (data not shown). ANOVA, P > 0.05.

Mean resting E_M of unexcitable HyperKPP soleus fibers significantly different from that of wild type. ANOVA and LSD, P < 0.05.

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