<qa>  What is the RT record for the reflex threshold?- Nociceptive component of Withdrawal reflex RIIIr: The RIIIr wil be elicited by delivering percutaneous electrical stimulation on sural nerve behind the right lateral malleolus and recording responses from the ipsilateral brevis head of the biceps femoris muscle. For the reflex threshold RT record, the initial current intensity will be adjusted to 2 mA and increased on steps of 1 mA, until obtain a response of at least 20 μV, accompanied by pain report. Then, 5 stimulus 130 RT will be applied to obtain the latency and area average. Besides, pain perception will be controlled through an analogue scale graded from 0 without perception of pain to 10 points greater pain already felt. 