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The purpose of this study was to examine how pain to punctate mechanical stimuli varies with position within the zone of secondary hyperalgesia. Secondary hyperalgesia was produced by an intradermal injection of capsaicin (50 μg) into the volar forearm of human volunteers (n=9). Before and at 20, 60 and 100 min after the capsaicin injection, a computer-controlled electromechanical stimulator was used...
Intradermal injection of the capsaicin analogue, NE-21610 (Procter and Gamble), inactivates nociceptors but not low-threshold mechanoreceptors in monkey. The present study examined the effects of cutaneous NE-21610 on heat and mechanical sensation in normal human volunteers. In the first series of experiments, subjects received intradermal (i.d.) injections (30 μl) of the vehicle alone or with the...
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