TABLE 1.Passive and active membrane properties of interneurons and motoneurons
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Interneuron | Motoneuron | |
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n | 41 | 27 |
Vm,mV | –68.5 ± 2.8 (13)** | –78.5 ± 1.4 (27) |
Rm, MΩ | 886.5 ± 117.5 (25)*** | 82.0 ± 10.6 (17) |
τ, ms | 60.1 ± 3.8 (25)*** | 18.5 ± 3.3 (17) |
AP amplitude, mV | 62.0 ± 1.71** (24) | 72.0 ± 2.7 (16) |
AP duration, ms | 1.6 ± 0.1* (24) | 1.18 ± 0.1 (16) |
AP threshold, mV | –55.8 ± 1.0** (24) | –61.2 ± 1.2 (16) |
Rheobase, pA | 31.4 ± 4.7*** (24) | 329.1 ± 75.0 (16) |
Firing frequency, Hz | 11.43 ± 1.095** (24) | 21.29 ± 2.357 (16) |
AHP amplitude, mV | –7.1 ± 0.44*** (21) | –11.6 ± 0.7 (16) |
AHP duration, ms | 132.2 ± 12.8*** (21) | 72.9 ± 5.2 (16) |
Sag, % | 17.6 ± 1.9 (22) | 11.3 ± 0.9 (13) |
Values are means ± SE; n, number of cells. Numbers of observations are in parentheses. Mean firing frequency was measured at twofold the rheobase.
Statistical significance was assessed by Student's unpaired t-test:
* P < 0.05;
** P < 0.01;
*** P < 0.001 versus motoneurons.