Description Module
The Description Module contains narrative descriptions of the clinical trial, including a brief summary and detailed description. These descriptions provide important information about the study's purpose, methodology, and key details in language accessible to both researchers and the general public.
Description Module path is as follows:
Study -> Protocol Section -> Description Module
Description Module
Ignite Creation Date:
2025-12-25 @ 1:22 AM
Ignite Modification Date:
2025-12-25 @ 1:22 AM
NCT ID:
NCT06127693
Brief Summary:
The goal of this observational study is to investigate how adverse experiences during childhood are linked to people experiencing persistent pain and fatigue in adulthood.
The questions the investigators aim to answer are:
1. Does participant-reported childhood adversity predict levels of IL-6 and TNF-α after in vitro provocation of whole blood using endotoxin?
2. Do levels of IL-6 and TNF-α after in vitro immune provocation using endotoxin predict vulnerability to persistent pain and fatigue after in vivo immune provocation (tetravalent influenza vaccine)?
3. Do levels of IL-6 and TNF-α after in vitro immune provocation using endotoxin predict vulnerability to persistent pain and fatigue after in vivo neural provocation?
For this study, the investigators will recruit and enrol 96 healthy human adults (18 - 65 years old) with a range of adverse experiences during childhood. Participants will attend 2 study sessions during which the investigators will take a sample of blood, assess pressure pain threshold before and after cold water immersion, assess heart rate variability, and assess the surface area of secondary skin hypersensitivity after electrical stimulation. At the end of the first session, participants will receive the influenza vaccination.
Detailed Description:
Background
Adverse experiences during childhood (childhood adversity) are associated with an increased risk of persistent pain and fatigue in adulthood. While the physiological relationships that link childhood adversity, persistent pain, and fatigue are unclear, all three factors are each associated with heightened innate immune and neural responses in adulthood. As such, neuroimmune interactions could underlie the relationship between childhood adversity, persistent pain, and fatigue, although the balance between the immune and neural influences likely varies across individuals.The investigators hypothesise that childhood adversity influences persistent pain and fatigue by priming: 1) immune, 2) neural, or 3) both systems, within an individual. Although previous studies have examined either immune or neural processes representing vulnerability to persistent pain and fatigue, the investigators are not aware of any study that has investigated both systems in the same cohort.
Methods
96 healthy adult humans with a range of childhood adversity history will undergo psychophysical testing before and after in vivo neural provocation (high frequency electrical stimulation) and, separately, immune provocation (influenza vaccine). Study proxies for vulnerability to persistent pain are surface area of secondary skin hypersensitivity induced by neural provocation and change in conditioned pain modulation after immune provocation; the proxy for vulnerability to fatigue is heart rate variability 24h after immune provocation. Immune responsiveness is represented by IL-6 and TNF-α levels in supernatant after in vitro lipopolysaccharide provocation of whole blood. The investigators hypothesise that levels of IL-6 and TNF-α after in vitro immune provocation will be positively associated with the area of secondary skin hypersensitivity after in vivo neural provocation, and negatively associated with conditioned pain modulation after in vivo immune provocation.
Study:
NCT06127693
Study Brief:
Protocol Section:
NCT06127693