Article: Electrophysiological properties of rat phrenic motoneurons during perinatal development.

Table 2.

Changes in the firing properties of PMNs^a

	E16	E18	P0–P1
Firing threshold,I _thr, pA^a	41 ± 5	48 ± 13	98 ± 18^* ^{,^‡}
Firing frequency, Hz^b
I _thr	7.1 ± 0.5	9.8 ± 0.9	13.2 ± 0.7^* ^{,^‡}
2 ×I _thr	14.4 ± 1.0	18.4 ± 1.3^{^†}	28.0 ± 2.3^* ^{,^‡}
First ISI frequency, Hz
I _thr	12.6 ± 0.9	13.9 ± 1.8	29.6 ± 3.7^* ^{,^‡}
2 × I _thr	24.1 ± 2.2	27.9 ± 2.6	52.5 ± 5.3^* ^{,^‡}
Current–frequency slope,^cHz/nA
First ISI	444 ± 51	600 ± 75	501 ± 60
Last ISI	340 ± 43	327 ± 41	271 ± 44

Results were compiled from the firing discharges of PMNs that illustrate repetitive firing patterns similar to those in Fig. 8, A–C (i.e., bursting and high-threshold PMNs not included in data), after a series of 1-s depolarizing current pulses of increasing amplitude from a holding potential of approximately −60 mV. Measurements of the interspike intervals (ISIs) were carried out at the beginning and the end of the depolarizing pulse. ^a Firing threshold was determined as the lowest stimulation current necessary to evoke repetitive firing. ^b Firing frequency was determined as the number of action potentials per 1-s stimulation.^c Current–frequency slope was the ratio of the first or last ISI frequency vs. injected current. (*) P ≤ 0.01, (†)P ≤ 0.05 vs. E16 or (‡)P≤ 0.05 vs. E18.

Inferred neuron-electrophysiology data values

Neuron Type	Neuron Description	Ephys Prop	Extracted Value	Standardized Value	Content Source
Spinal cord ventral horn motor neuron alpha		rheobase	7.1 ± 0.5	7.1 (pA)	Data Table
Spinal cord ventral horn motor neuron alpha		rheobase	12.6 ± 0.9	12.6 (pA)	Data Table