Evidence of increased motoneuron excitability in stroke patients without clinical spasticity.
BACKGROUND
The contribution of hyperreflexia to impairment after stroke is debated. Spinal motoneuron excitability in healthy subjects and stroke patients with and without spasticity was compared.


METHODS
Twenty-four patients with single stroke more than 6 months ago and 18 gender-matched healthy volunteers were included. Spasticity was assessed according to the Modified Ashworth Scale. Mmax amplitude and F wave frequency in the abductor pollicis brevis muscle were measured by electrical stimulation of the median nerve.


RESULTS
Mmax values were comparable between the groups. However, patients with (n=7) and without (n=17) clinically evident spasticity had a significant increase in F wave frequency when compared with healthy subjects. F wave frequency did not differ between spastic and nonspastic patients.


CONCLUSIONS
Increase in spinal motoneuron excitability after stroke is present in stroke patients with minor or no motor deficiencies and does not necessarily lead to spasticity.
Udby Blicher
Jakob
J
Hammel Neurorehabilitation and Research Centre, Aarhus University Hospital, Hammel, Denmark. neujbl@sc.aaa.dk
Nielsen
Jørgen Feldbaek
JF
D000200:Action Potentials / Q000502:physiology; D000328:Adult; D000368:Aged; D001921:Brain / Q000473:pathology / Q000503:physiopathology; D004558:Electric Stimulation; D004568:Electrodiagnosis / Q000379:methods; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008475:Median Nerve / Q000503:physiopathology; D008875:Middle Aged; D009046:Motor Neurons / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D009128:Muscle Spasticity / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000503:physiopathology; D009431:Neural Conduction / Q000502:physiology; D011237:Predictive Value of Tests; D012021:Reflex, Abnormal / Q000502:physiology*; D013116:Spinal Cord / Q000503:physiopathology*; D020521:Stroke / Q000150:complications / Q000503:physiopathology*