Key result
Recording F waves following 10 stimuli provides latency measurements within 1 ms of true values, while 20 stimuli provide mean latencies within 0.5 ms.
Why the study?
How many stimuli are required to obtain accurate normative F wave values in normal subjects?
Observational (n=11)
How many stimuli are required to obtain accurate normative F wave values in normal subjects?
Answers are grounded in this paper and cite their sources.
Recording 10 to 20 stimuli is sufficient for accurate mean latency measurements of F waves, though more stimuli are needed for chronodispersion and repeater waves.
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Fisher et al. (1994) conducted an observational in Healthy (n=11). Number of supramaximal stimuli vs. 100 stimuli ('true' values) was evaluated on F wave latency, persistence, chronodispersion, amplitude, and repeater waves. Recording F waves following 10 stimuli provides latency measurements within 1 ms of true values, while 20 stimuli provide mean latencies within 0.5 ms.
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