Table 1.

Action potential parameters (mean ± SD) for DRG neurons with (AINF) and without (A0) an inflection on the falling phase of the spike in experiments performed at 20 and 37°C

Neuron type/ temperatureCond. velocity (m/sec)Resting potential (mV)Spike amplitude (mV)Spike duration (msec)
20 and 37°C
A07.0  ± 2.3−54.0  ± 6.667.0  ± 15.60.6  ± 0.3
n  = 47n  = 88n  = 88n  = 88
AINF5.3  ± 2.7−57.6  ± 7.075.2  ± 14.01.3  ± 0.7
n  = 31n  = 48n  = 48n  = 48
A0 vs AINFp  < 0.01p  < 0.01p  < 0.01p  < 0.01
A0 at 20°C6.0  ± 2.4−53.3  ± 5.860.5  ± 9.41.0  ± 0.3
n  = 13n  = 21n  = 21n  = 21
AINF at 20°C4.9  ± 3.3−58.8  ± 5.566.2  ± 11.62.7  ± 1.1
n  = 4n  = 6n  = 6n  = 6
A0 at 37°C7.3  ± 2.2−54.2  ± 6.869.0  ± 16.60.5  ± 0.1
n  = 34n  = 67n  = 67n  = 67
AINF at 37°C5.3  ± 2.7−57.4  ± 7.276.5  ± 141.1  ± 0.4
n  = 27n  = 42n  = 42n  = 42
Both at 20°C5.7  ± 2.6−54.5  ± 6.161.8  ± 101.4  ± 0.9
n  = 17n  = 27n  = 27n  = 27
Both at 37°C6.4  ± 2.6−55.4  ± 7.171.9  ± 160.7  ± 0.4
n  = 61n  = 109n  = 109n  = 109
20°C vs 37°Cp  > 0.2p  > 0.2p  < 0.01p  < 0.001
  • p values are based on two-tailed Mann–WhitneyU tests.