F-waves were determined in the peroneal nerves of 17 normal subjects, 11 @entity746 ( @entity746 ) @entity1 , and 13 @entity1 with other disorders causing @entity194 ( @entity194 ) in extensor digitorum brevis muscle. F-waves were examined with regard to latency and waveform. Latency was increased above normal for both @entity746 and @entity194 @entity1 (P less than 0.024 and P less than 0.003, respectively). In normal subjects, the mean number of repeated responses (same latency and waveform) was 1.9 (r = 1.0-5.0), where 1.0 corresponds to no repeated response. In @entity746 @entity1 , repeated responses were 2.9 (r = 1.2-7.8), which is not significantly different from normal (P less than 0.099). In @entity194 @entity1 , repeated responses were 6.5 (r = 1.6-23), which is significantly above normal (P less than 0.041). A dominant waveform occurred in 21.5% (mean) of responses in normal subjects (r = 4%-58%). In @entity746 and @entity194 , corresponding values were 40.3% (r = 10%-88%) and 44.1% (r = 17%-100%), both of which were significantly above normal (P less than 0.014 and P less than 0.012, respectively). The distribution of F-wave latencies is often nonrandom in normal, @entity746 , and @entity194 subjects. The dominant F-wave that was present in normal subjects and significantly increased in @entity746 and @entity194 subjects may result from decreased numbers of motoneurons capable of contributing to the F-response and would seem to be a useful additional measure of abnormality.

F-waves in XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity194 :: ('MESH:D001284', 'Disease') :: ['neurogenic atrophy', 'NA'] @entity746 :: ('MESH:D000690', 'Disease') :: ['ALS', 'amyotrophic lateral sclerosis']
@entity194 :: (MESH:D001284,Disease) :: ['neurogenic atrophy']
