Table 2.
Developmental changes in swimming parameters
| Parameter | Day 2 | Day 3 | Day 4 |
|---|---|---|---|
| Free swimming tail beat frequency, Hz | 67 ± 6 (11)* | not measured | 35 ± 2 (12)* |
| Fictive swimming EPSP frequency, Hz | 52 ± 4 (15)* | 51 ± 2 (16)2-160 | 35 ± 3 (7)* 2-160 |
| Fictive swimming EPSC frequency, Hz | 44 ± 2 (6) | 48 ± 4 (5) | 37 ± 3 (4) |
| Pooled fictive swimming frequency, Hz | 49 ± 3 (21)* | 51 ± 2 (21)2-160 | 35 ± 2 (11)* 2-160 |
| Fictive swimming EPSC amplitude, pA | 37 ± 5 (6)* 2-160 | 52 ± 10 (5)* | 63 ± 20 (4)2-160 |
| Fictive swimming tonic potential, mV | −54 ± 2 (15) | −54 ± 2 (16) | −55 ± 2 (7) |
| Fictive swimming tonic inward current, pA | 35 ± 10 (6) | 35 ± 7 (5) | 56 ± 20 (4) |
| Resting membrane potential | −69 ± 1 (15) | −70 ± 1 (16) | −69 ± 1 (7) |
| Action potential threshold potential, mV | −41 ± 1 (15) | −41 ± 1 (16) | −43 ± 2 (7) |
| Action potential peak potential, mV | −15 ± 3 (15) | −13 ± 3 (16) | −13 ± 7 (7) |
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Values shown are means ± SE. Values in brackets are the number of motoneurons examined to calculate the presented mean values. EPSP and EPSC, excitatory postsynaptic potential and current.
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↵* or
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↵F2-160 indicates a significant difference of means (Student's t-test or Mann-Whitney rank sum test); comparisons were made horizontally in the Table.