F-response assessment in healthy control subjects.

Various parameters of the F-response (latencies, chronodispersion, amplitude, duration, shape, persistence) were investigated in ulnar and tibial nerves of 50 healthy subjects of both sexes, aged between 16 to 79 years. The observations were made bilaterally and the results revealed no significant differences in any of the F-parameters by comparing side to side. The relationships between each neurophysiological F-response data and limb length, age and sex of control subjects were determined. Correlations of high statistical significance were found between minimum F-latency and limb length as well as between absolute and F%/M-amplitude and age. Cross-correlation coefficients correlating mean individual values of latency-duration, latency-amplitude and amplitude-duration did not show any significant relationship between latency, amplitude and duration in normal subjects.