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Article: Diversification of intrinsic motoneuron electrical properties during normal development and botulinum toxin-induced muscle paralysis in early postnatal mice.

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Nakanishi ST; Whelan PJ
J. Neurophysiol., 2010


Table 1.

Developmental changes of combined flexor and extensor motoneuron intrinsic electrical properties

P0–P3 (n = 72) P8–P11 (n = 36)
Property Mean SE Mean SE P Value
Action potential
    Amplitude, mV 74.06 1.16 74.90 2.47 NS (0.73)
    Half-width, ms 1.33 0.05 0.97 0.07 <0.0001*
    Time-to-peak, ms 0.98 0.04 0.81 0.06 <0.05*
    Threshold, mV −51.86 0.77 −56.00 2.12 <0.05*
Rheobase current, pA 157.60 8.41 287.70 40.71 <0.0001*
    Rheobase current CV, % 38.15 79.42 <0.05*
Afterhyperpolarization
    Half-decay time, ms 45.31 10.83 48.63 20.15 NS (0.30)
    Half-decay time CV, % 22.07 43.36 <0.001*
    Duration, ms 152.80 5.13 148.20 9.94 NS (0.48)
Input resistance (Rin), MΩ 99.47 6.45 87.27 10.23 NS (0.30)
    Rin CV, % 41.29 79.81 <0.05*
f–I gain, Hz/nA 56.26 3.03 56.09 8.55 NS (0.98)
    f–I gain CV, % 32.03 33.59 NS (0.92)
  • n = number of motoneurons. CV, coefficient of variation.

  • * indicates significance; NS, not significant.


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