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Article: Frequency-current relationships of rat hindlimb alpha-motoneurones.

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Button DC; Gardiner K; Marqueste T; Gardiner PF
J. Physiol. (Lond.), 2006


Table 1. Passive and active motoneurone properties

Motoneurone property KX fast cells KX slow cells Decerebration fast cells P value
Summary of passive (numbers 1–6 in chart) and active MN properties (numbers 7–12 in chart). Data are presented as means ± 1 s.d. for MNs in each group and include all f–I relationship types. KX, ketamine–xylazine anaesthetized; RMP, resting membrane potential; Vth, voltage threshold; AHP, after-hyperpolarization; and ePIC, estimated persistent inward current. * Significant difference between KX fast and slow motoneurones; † significant difference between KX fast and decerebration fast motoneurones.
(1) RMP (mV) −70.9 ± 6.3 −64.2 ± 5.9   −61.7 ± 7.8  † 0.005
(2) Vth (mV) −51.6 ± 6.6 −46.1 ± 11.7  −45.6 ± 7.2  † 0.02
(3) Rheobase current (nA)   9.8 ± 3.0  5.9 ± 4.7   6.4 ± 1.8 * 0.01
n = 21 n = 7 n = 14 † 0.01
(4) Input resistance (MΩ)   1.8 ± 0.6  2.7 ± 1.2   2.2 ± 0.9 * 0.01
n = 21 n = 7 n = 14
(5) AHP amplitude (mV)   1.5 ± 1.1  2.7 ± 2.1   2.6 ± 2.2 0.06
(6) AHP ½ decay time (ms)  13.8 ± 1.9 27.3 ± 6.6  12.7 ± 2.9 * 0.00
n = 21 n = 7 n = 14
(7) Current at spike recruitment (nA)  11.0 ± 3.1  7.4 ± 3.9   6.9 ± 4.0 * 0.004
n = 21 n = 7 n = 14 † 0.001
(8) Current at spike derecruitment (nA)  10.9 ± 3.1  7.0 ± 4.0   6.6 ± 4.2 * 0.01
n = 21 n = 7 n = 14 † 0.001
(9) Instantaneous frequency at spike recruitment (Hz)  26.5 ± 7.7 16.7 ± 7.2  19.0 ± 6.7 * 0.003
n = 21 n = 7 n = 14 † 0.003
(10) Instantaneous frequency at spike derecruitment (Hz)  24.7 ± 6.8 14.1 ± 5.6  16.3 ± 4.6 * 0.000
n = 21 n = 7 n = 14 † 0.000
(11) Slope (Hz nA−1) depolarizing  17.8 ± 9.7 15.3 ± 8.5   15.1 ± 11.0 0.6
n = 21 n = 7 n = 14
(12) ePIC (nA)   0.2 ± 0.6  0.4 ± 0.3   0.3 ± 0.5 0.6
n = 21 n = 7 n = 14

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