Pain
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Comparative Study Clinical Trial
Are runners stoical? An examination of pain sensitivity in habitual runners and normally active controls.
Anecdotal and clinical reports suggest that athletes are stoical. However, there are few studies comparing persons who exercise regularly with those who do not. This study compared two independent samples of regular runners and normally active controls, both without recent exercise, on cold pressor, cutaneous heat, and tourniquet ischemic pain tests. ⋯ The cohorts also did not differ in their report of ischemic pain sensations. Thus, these data do not generally support the hypothesis of pain insensitivity or stoicism in habitual runners. Rather, insensitivity occurs only in their response to noxious cold, which is suggested to be an adaptation to regular training.
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Clinical Trial
A psychophysical study of secondary hyperalgesia: evidence for increased pain to input from nociceptors.
Substantial evidence suggests that the hyperalgesia to mechanical stimuli that occurs in an area of uninjured skin surrounding a site of injury (area of secondary hyperalgesia) arises from activity in low-threshold mechanoreceptors (LTMs). In this study, we have investigated if activity in mechanically sensitive nociceptors also contributes to this secondary hyperalgesia. It is known that all woollen fabrics excite LTMs, but that only the prickly ones activate mechanically sensitive nociceptors. ⋯ On the other hand, little if any pain was evoked by the fabrics when applied to normal skin, but substantial pain was produced by all fabrics when applied to hyperalgesic skin. The pain ratings were graded with the ratings of prickle so that fabrics that evoked the greatest prickle also evoked significantly more pain. The magnitude of pain increased linearly with prickle sensation; the slope of this regression function increased substantially in hyperalgesic skin.(ABSTRACT TRUNCATED AT 250 WORDS)
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Cognitive-behavioral models suggest that pain patients' beliefs about their pain play a critical role in their adjustment. This study sought to replicate and extend previous research that has examined the relationship between pain-specific beliefs and adjustment to chronic pain. Two hundred forty-one chronic pain patients evaluated for possible admission to an inpatient pain treatment program completed the Sickness Impact Profile (SIP) and the Survey of Pain Attitudes (SOPA), as well as measures of pain, medical services utilization and demographic characteristics. ⋯ The beliefs that one is disabled and that activity should be avoided because pain signifies damage were associated positively with physical disability. None of the beliefs assessed was significantly associated with number of physician visits in the previous 3 months, although belief in the appropriateness of medications for managing chronic pain was associated positively with pain-related emergency room visits. The results support a cognitive-behavioral model of chronic pain adjustment and suggest specific pain beliefs to target in treatment studies examining causal relationships between beliefs and adjustment.
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It is commonly accepted that application of a sustained noxious stimulus frequently suppresses the perception of pain. In this investigation, we have determined whether painful forearm ischemia suppresses tooth pain resulting from an acute irreversible pulpitis. We have also determined whether the physiological responses to toothache alter the perception of pain evoked by experimental procedures. ⋯ In contrast, sustained noxious forearm ischemia produced a marked reduction in the intensity, unpleasantness and spatial distribution of pulpal pain. These effects on pulpal pain remained for at least 5 min after removal of the tourniquet while the arm was pain free. These findings suggest that a noxious conditioning stimulus does not universally inhibit pain perception but instead depends on unidentified interactions between the noxious test and conditioning stimuli.
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The Coping Strategies Questionnaire (CSQ) (Rosenstiel and Keefe 1983) is the most widely used measure of pain coping strategies. To date, with one exception (Tuttle et al. 1991), studies examining the factor structure of the CSQ have used the composite scores of its 8 a-priori theoretically derived scales rather than the 48 individual items. An examination of the match between the 8 theoretically derived scales and scales empirically extracted from an item analysis is lacking. ⋯ Four subscales, Catastrophizing, Reinterpreting Pain Sensations, Praying and Hoping and (to a lesser degree) Ignoring Pain Sensations, correspond with parallel subscales proposed by Rosensteil and Keefe (1983). The fifth subscale, Distraction, is comprised of items from their Diverting Attention and Increasing Activity Level subscales, suggesting that cognitive and behavioural distraction comprise 1 rather than 2 coping strategies. That CSQ items on the original Coping Self-Statements and the Increasing Pain Behaviour subscales failed to load consistently on any factor suggests that they do not reliably measure distinct coping strategies.(ABSTRACT TRUNCATED AT 250 WORDS)