| Cluster 1 | Cluster 2 | Cluster 3 | Cluster 4 | |
|---|---|---|---|---|
| Passive | ||||
| RMP (mV) | –70.3 | –68.8 | –74.2 | –70.6 |
| Input Resistance (mOhm) | 95.4 | 73.4 | 48.0 | 43.8 |
| Membrane time constant (ms) | 8.9 | 6.9 | 4.9 | 2.2 |
| SAG ratio (h current) | 18.9 | 11.0 | 18.2 | 3.7 |
| Active (500 ms square pulse) | ||||
| FIF (Hz) Instantaneous firing, beginning of the pulse | 45.9 | 164.8 (doublet action potentials) | 340.6 | 424.0 |
| SSF (Hz) Steady-state firing end of the pulse | 31.9 | 50.3 | 74.6 | 147.7 |
| Muscle innervation | ||||
| Muscle | Soleus | Soleus | Tibialis Anterior | Tibialis Anterior |
| Fiber type | Slow twitch fiber | Slow twitch fiber | Fast twitch fiber | Fast twitch fiber |
Motoneuron subtypes were defined using cluster analysis and functional identity was achieved with retrograde labeling of known muscle types (38). Soleus: slow-twitch fiber type and Tibialis anterior: fast-twitch fiber type. RMP, resting membrane potential; FIF, firing frequency; SSF, steady-state firing.
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