| Mouse . | [K+]e (mM) . | 2.4 mM Ca2+ . | 0.3 mM Ca2+ . |
|---|---|---|---|
| Wild type | 4.7 | −76.7 ± 0.9 (89/11) | −78.1 ± 1.2 (87/9) |
| 10.0 | −69.2 ± 1.8 (106/11) | −68.5 ± 3.5 (39/7) | |
| HyperKPP | 4.7 | −74.9 ± 1.4 (79/6) | −74.2 ± 1.0 (79/6) |
| 10.0 | −60.2 ± 1.5 (67/6) | — |
| Mouse . | [K+]e (mM) . | 2.4 mM Ca2+ . | 0.3 mM Ca2+ . |
|---|---|---|---|
| Wild type | 4.7 | −76.7 ± 0.9 (89/11) | −78.1 ± 1.2 (87/9) |
| 10.0 | −69.2 ± 1.8 (106/11) | −68.5 ± 3.5 (39/7) | |
| HyperKPP | 4.7 | −74.9 ± 1.4 (79/6) | −74.2 ± 1.0 (79/6) |
| 10.0 | −60.2 ± 1.5 (67/6) | — |
Excitable fibers were fibers that generated an action potential upon stimulation. No action potential could be recorded at 10 mM K+ and 0.3 mM Ca2+ in HyperKPP fibers. Mean resting EM values are expressed as mean ± SE (number of fibers/number of muscle). There was no significant difference in mean resting EM of excitable fibers between 0.3 and 2.4 mM Ca2. ANOVA, P > 0.05.