Normal F-wave were investigated in both deep peroneal nerve and posterior tibial nerve of 20 normal healthy subjects.

The minimal latency, mean latency, persistency, and chronodispersion were obtained.

The optimal stimulation parameters to obtain reliable information on F-wave studies were: stimulation duration of 0.2msec with a strength adjusted 30% supramaximal to the direct M-response. 10 consecutive stimuli at rest and the deflections larger than 50λV were accepted.

Keywords :Chronodispersion, F-wave, Normative values, Persistency, Chronodispersion