Key result
Electrical stimulus durations between 0.5 and 1 msec optimally brought out H reflexes in healthy subjects.
Why the study?
What is the optimal electrical stimulus duration for recording H reflexes in healthy subjects?
What is the optimal electrical stimulus duration for recording H reflexes in healthy subjects?
A stimulus duration between 0.5 and 1 msec is optimal for recording H reflexes.
May guide H-reflex protocols in healthy subjects; leaves optimal parameters open in clinical populations.
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.
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Panizza et al. (1989) studied Healthy (n=10). Electrical stimulus was evaluated on Amplitude of the H reflex and relation between H reflex and M response. Electrical stimulus durations between 0.5 and 1 msec optimally brought out H reflexes in healthy subjects.
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