Optimal stimulus duration for the H reflex.
Authorities advocate different stimulus durations to produce an H reflex. In order to find the optimal stimulus duration for recording H reflexes, the recruitment curves for H reflexes and M responses were studied in 10 healthy subjects. The H reflex was recorded in the upper and lower extremities, and the durations of the electrical stimulus used ranged from 0.1 to 3 msec. The amplitude of the H reflex and the relation between the H reflex and M response changed with stimulus duration. H reflexes are brought out to advantage using a stimulus duration between 0.5 and 1 msec.
Human Motor Control Section, National Institute of Neurological and Communicative Disorders and Stroke, Maryland 20892.
M
M
Panizza
J
J
Nilsson
M
M
Hallett
D000328:Adult; D004558:Electric Stimulation / Q000592:standards*; D006181:H-Reflex; D006801:Humans; D008875:Middle Aged; D012023:Reflex, Monosynaptic; D013997:Time Factors