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Assessment of opiate modulation of pain and nociceptive responding in young adults with a parental history of hypertension |
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| Authors: | France Christopher R al'absi Mustafa Ring Christopher France Janis L Brose John Spaeth Donald Harju Angie Nordehn Glenn Wittmers Lorentz E |
| Institution: | aDepartment of Psychology, Ohio University, 245 Porter Hall, Athens, OH 45701, USA bDepartment of Behavioral Sciences, School of Medicine, University of Minnesota, Duluth, MN, USA cSchool of Sport and Exercise Sciences, University of Birmingham, UK dCollege of Osteopathic Medicine, Ohio University, Athens, OH, USA eDepartment of Family Medicine, School of Medicine, University of Minnesota, Duluth, MN, USA fDepartment of Physiology, School of Medicine, University of Minnesota, Duluth, MN, USA |
| Abstract: | This double blind, placebo-controlled study examined the effects of an opiate antagonist, naltrexone, on nociceptive flexion reflex (NFR) thresholds and subjective pain in individuals with and without a parental history of hypertension. Using a repeated measures design, NFR threshold was repeatedly assessed on two testing days after administration of either placebo or naltrexone. Immediately after NFR threshold was determined, participants rated the level of pain experienced during the preceding NFR assessment, and at the end of each session participants’ electrocutaneous pain threshold was assessed. Two primary findings were obtained. First, individuals with a parental history of hypertension exhibited attenuated pain sensitivity. Second, endogenous opioid blockade was associated with increased pain ratings in women but with increased pain threshold in men. In sum, the present study did not support a direct involvement of the endogenous opioid system in the attenuated pain sensitivity observed in individuals at increased risk for hypertension. |
| Keywords: | NFR Nociception Endogenous opiates Risk for hypertension |
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