[Temperature dependence and intraindividual variability of electrophysiologic parameters of the sural nerve]

In 10 healthy volunteers we investigated the temperature dependence of electrophysiological parameters of the sural nerve. The mean values in the range between 28,5 degrees and 35 degrees C with increasing temperatures were: +1.1 m/s/degree C +/- 0,94 for the sensory orthodromic conduction velocity; -0.39 microV/degree C +/- 0.51 for the orthodromic sensory amplitude (NAP-amplitude) and -0.01 ms/degree C +/- 0.04 for the duration of the NAP (NAP-duration). The number of phases did not change. Investigating twice the dependence of the electrophysiological parameters of the sural nerve on the temperature in 9 controls, it was shown that this dependence remains relatively constant in the single subject. In 20 healthy volunteers we determined normal values of the intraindividual variability of the electrophysiological parameters of the sural nerves. The values were: 5.70% +/- 3.81 for the NCV; 23.60% +/- 14.66 for the NAP-amplitude and 10.05% +/- 7.35 for the NAP-duration. The number of phases did not change.