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Variations in baseline skin temperature can be encountered in experimental and clinical pain states. Such variations have been shown to greatly alter the response to radiant heat stimuli when the temperature of the stimulus is not controlled. We carried out a psychophysical investigation to examine the influence of baseline skin temperature on pain ratings to temperature-controlled heat stimuli. A...
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...
Cutaneous injection of the capsaicin analog NE-21610 (Procter and Gamble) produces analgesia to heat but not mechanical stimuli in humans. The present study examined whether pretreatment of the skin with NE-21610 prevents the development of hyperalgesia following heat injury. On the 1st day of testing, 7 volunteers received a 30-μl intradermal injection of vehicle to one volar forearm and 10 μg...
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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