Table 1.

Summary of intrinsic membrane properties in spinal lamina I neurons^a.

Characteristic	Control (n = 9)	CS (LTP + no LTP) (n = 16)	LTP (n = 10)	No LTP (n = 6)
RMP, mV
Pre	−55 ± 1	−55 ± 3	−57 ± 4	−52 ± 2
Post	−58 ± 4	−52 ± 1	−51 ± 2	−54 ± 1
Action potential threshold, mV
Pre	−34 ± 2	−37 ± 2	−40 ± 3	−33 ± 3
Post	−33 ± 2	−37 ± 2	−39 ± 3	−33 ± 4
RMP − action potential threshold, ΔV, mV
Pre	21 ± 2	18 ± 4	17 ± 6	19 ± 2
Post	25 ± 5	15 ± 3	12 ± 3	21 ± 4
Action potential height, mV
Pre	87 ± 5	89 ± 3	89 ± 4	88 ± 5
Post	77 ± 5⁎	85 ± 3⁎	87 ± 3	83 ± 6⁎
Action potential width at base, ms
Pre	1.5 ± 0.2	1.4 ± 0.1	1.5 ± 0.1	1.3 ± 0.1
Post	1.5 ± 0.2	1.4 ± 0.1	1.4 ± 0.1	1.3 ± 0.1
Posthyperpolarization amplitude, mV
Pre	−30 ± 3	−30 ± 3	−27 ± 3	−35 ± 4
Post	−33 ± 3⁎	−30 ± 3	−26 ± 3⁎	−37 ± 5
Membrane resistance, MΩ
Pre	712 ± 89	601 ± 131	592 ± 151	616 ± 240
Post	380 ± 83⁎	346 ± 77⁎	408 ± 119	243 ± 37⁎

CS, conditioning depolarizing stimulation; LTP, long-term potentiation; RMP, resting membrane potential.

^aData are presented as mean ± 1 standard error of the mean. No statistically significant difference was observed in any of the stimulated groups compared to the control group, nor between any of the depolarized groups, respectively.

^⁎P < 0.05 compared to baseline values (Pre).