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- Studies have examined brain activity through a number of methods including positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) in response to different pain modalities.
Limited clinical research has addressed sex differences in outcomes from physical medicine or interdisciplinary treatments. Several studies have examined potential sex differences in outcomes of treatments for back pain. The experience of pain is endogenously modulated, and several experimental approaches to engaging pain modulatory systems are reviewed in this article. One experimental model of endogenous inhibition is diffuse noxious inhibitory controls (DNIC).
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Two studies reported that males displayed higher pain threshold and tolerance.128,161 Despite large sample sizes for several studies,107,124,132,133,161 sex differences in ischemic pain have not been statistically significance due to their small effect sizes. Epidemiologic studies of pain typically report point prevalence (currently in pain), period prevalence (ie, experiencing pain during the past month or year), or lifetime prevalence. Some of the studies reviewed have measured pain intensity or severity ratings and depression, a common impact of chronic pain, and when sex differences were tested, we will report the findings. One issue worth mentioning is over interpretation of positive findings for sex differences in pain due to publication biases. It seems plausible that in some cases sex differences were tested, found to be nonsignificant, and then not reported in a manuscript.93 This may be particularly true for population-based studies of prevalence in which pain intensity or severity is of secondary interest.
- Because qualitative differences may indicate sex-specific pain mechanisms they represent the most compelling rationale for the development of sex-specific pain treatments.
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- Females were also found to rate heat pain as more intense and unpleasant in the majority of studies that included a suprathreshold protocol (7/9, 78%), and one study found that females required lower temperatures to evoke moderate pain.411 Overall, the hypothesis that heat pain sensitivity differs as a function of sex has been supported.
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