Key result
Suprathreshold pressure stimulation induced significant skin temperature decreases in the areas of referred pain, with females exhibiting greater temperature reductions than males.
Why the study?
Mechanisms controlling pain distribution are not completely known, prompting an evaluation of skin temperature variations in experimentally induced pain and potential sex differences.
Does suprathreshold pressure stimulation induce skin temperature variations in the area of referred pain in healthy individuals?
Observational (n=20)
No
Does suprathreshold pressure stimulation induce skin temperature variations in the area of referred pain in healthy individuals?
Sympathetic vasomotor responses, manifested as skin temperature decreases, contribute to expanded pressure-induced referred pain, especially among females.
Suggests sympathetic vasomotor responses may contribute to expanded pressure-induced referred pain; leaves open whether.
Background: Widespread pain partially depends upon sensitization of central pain mechanisms. However, mechanisms controlling pain distribution are not completely known. The present study sought to assess skin temperature variations in the area of experimentally-induced pain and potential sex differences. Methods: Pressure-pain thresholds (PPTs) were measured on the right infraspinatus muscle. At the end of Day 0, all participants performed an eccentric exercise of the shoulder external rotators to induce muscle soreness 24 hours after. On Day 1, participants indicated on a body chart the area of pain induced by 60 seconds of suprathreshold pressure stimulation (STPS; PPT + 20%) on the right infraspinatus muscle. Skin temperature variations in the area of referred pain were recorded with an infrared thermography camera, immediately before and after the STPS. Conclusions: These findings indicate that sympathetic vasomotor responses contribute to expand pressure-induced referred pain, especially among females.
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Doménech‐García et al. (2022) conducted an observational in Healthy (experimental pain model) (n=20). Suprathreshold pressure stimulation vs. Pre-stimulation baseline was evaluated on Skin temperature variation in the arm region before and after suprathreshold pressure stimulation on Day 1 (95% CI 0.15-0.50, p=0.001). Suprathreshold pressure stimulation induced significant skin temperature decreases in the areas of referred pain, with females exhibiting greater temperature reductions than males.
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