Stress-induced analgesia: adaptive pain suppression.
Level 5 - mechanism / opinion, no new human data
Narrative review and mechanistic framework without systematic review methodology or human clinical trial data
PubMed 2876446 · doi:10.1152/physrev.1986.66.4.1091
What was done
The authors reviewed experimental methods for measuring stress-induced analgesia (SIA), evaluating tests that distinguish between reflexive and nonreflexive behaviors and between sensory/discriminative and motivational/affective pain components. They also reviewed neurotransmitter and neuropeptide systems involved in both SIA and adaptive behavioral functions like learning and motivation.
What was found
The abstract reports no numerical values, sample sizes, or quantitative effect sizes. The authors qualitatively describe that the same manipulations that trigger stress-induced analgesia affect neurotransmitter and neuropeptide systems, and conclude that pain suppression functions adaptively by allowing an organism to execute survival behaviors during acute threats without pain interference.
Why it matters
The paper establishes a conceptual framework framing stress-induced analgesia as an active evolutionary survival adaptation rather than a passive breakdown of pain perception. It emphasizes the importance of evaluating both sensory and affective components in pain testing.
Limits
The abstract reports no empirical data, sample sizes, or quantitative measures. As a narrative review, it lacks systematic search criteria, and the mechanistic and behavioral concepts derive largely from theoretical and preclinical models rather than direct clinical human trials.
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