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The Hoffmann reflex (H-reflex) in senile dementia of the Alzheimer's type--preliminary results
Y Lamour1, J C Willer, M Roudier
1Laboratoire de Neurophysiologie Clinique, Université Paris VI, France.
Abstract:
The Hoffmann reflex (H-reflex) and direct motor response (M) were investigated (latency, amplitude and excitability curves were analyzed) in patients with senile dementia of the Alzheimer's type (SDAT). M responses had similar latencies in SDAT patients and old control subjects. H reflex latencies were similar in SDAT patients and old control subjects but longer than in younger controls. The H max/M max ratio was also lower in SDAT patients and old control subjects than in younger controls. The excitability curve of the H-reflex (using a double shock procedure) in SDAT patients was lower than in non-demented old controls for all values of the interstimulus intervals.