F-wave study at different stimulation rates in upper motoneurone lesions.
F-wave duration, amplitude and persistence at different frequencies of the antidromic impulse (0.2-0.5-1-2 Hz) were determined in 18 patients with vascular hemiplegia and in 32 healthy subjects of both sexes in the same age range. In normal subjects F amplitude and persistence showed a significant increase as the stimulation rate increased; in spastic patients a small difference in F amplitude was only found for greater difference in stimulus frequencies, the persistence did not significantly changed at different stimulation rates. Individual cross-correlation values (r) obtained for latency and duration, latency and amplitude, amplitude and duration did not show significant changes at different stimulation rates in patients and in controls.
Fierro
B
B
Department of Neuropsychiatry, University of Palermo, Italy.
Raimondo
D
D
Modica
A
A
D000368:Aged; D000369:Aged, 80 and over; D002561:Cerebrovascular Disorders / Q000150:complications; D004558:Electric Stimulation; D004576:Electromyography; D005260:Female; D006429:Hemiplegia / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009046:Motor Neurons / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D011930:Reaction Time; D013035:Spasm / Q000209:etiology / Q000503:physiopathology; D014459:Ulnar Nerve / Q000503:physiopathology