Effect of stimulus parameters on characteristics of the F-response in normal subjects.

Abstract:

:The F-response is a valuable tool for evaluating the functional integrity of proximal nerve segments. Although many studies have focused on the various F-response characteristics observed (e.g., latency, amplitude, duration, persistence, etc.), few have examined the significance of stimulus parameters on the resultant F-response. In this study, we examined the F-responses obtained in 25 healthy subjects when using various stimulus parameters. The stimulus parameters used were: 1) 0.5 Hz, 25% supramaximal intensity at 0.05 ms duration; 2) 0.5 Hz, 25% supramaximal intensity at 0.1 ms duration; 3) 0.5 Hz, 25% supramaximal intensity at 0.2 ms duration; 4) 0.5 Hz, 50% supramaximal intensity at 0.1 ms duration; 5) 3.0 Hz, 25% supramaximal intensity at 0.1 ms duration. No significant differences in F-response latency, amplitude, duration or persistence were seen when duration or intensity of stimuli was altered. However, changing stimulus frequency resulted in a significant decrease in latency and a significant increase in persistence and amplitude. Care should be taken in controlling for stimulus frequency to enhance the reproducibility of F-response determinations.

journal_name

Am J Phys Med Rehabil

authors

Clinchot DM,Colachis SC 3rd,Kaplansky BD,Mysiw WJ

doi

10.1097/00002060-199409000-00003

subject

Has Abstract

pub_date

1994-09-01 00:00:00

pages

313-8

issue

5

eissn

0894-9115

issn

1537-7385

journal_volume

73

pub_type

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