Table 2.

Summary of the characteristics of the action potential in mouse and cat motoneurons

MiceCats
Spike height (mV)72 ± 7 (65–88)***87 ± 10 (64–111)
n = 25n = 32
Spike width (ms)0.30 ± 0.05 (0.25–0.50)***0.45 ± 0.10 (0.35–0.70)
n = 25n = 32
AHP amplitude (mV)2.8 ± 1.7 (0.9–7.6)***5.2 ± 1.7 (1.8–9.7)
n = 20n = 32
Time to peak (ms)7.3 ± 2.9 (1.4–13.6)***10.5 ± 3.2 (7.3–18.7)
n = 20n = 32
AHP time constant (ms)10 ± 3 (6–14)***19 ± 7 (10–41)
n = 19n = 32
AHP half-decay time (ms)10.1 ± 2.4 (5.6–15.8)***21.1 ± 7.1 (11.3–42.6)
n = 20n = 32
AHP duration (ms)46 ± 11 (26–67)***73 ± 22 (40–141)
n = 19n = 32
  • Values in the cells are mean ± SD, with the range in parentheses, and the number of motoneurons. Asterisks indicate statistically significant differences (***p < 0.001) with cat motoneuron data (calculated using a one-tailed Student's t test). Cat data are from Manuel et al. (2005) and our unpublished data.