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. 2019 Sep;56(9):e13388.
doi: 10.1111/psyp.13388. Epub 2019 May 3.

Self-regulatory ability, fatigue, and the experience of pain: Mechanistic insights from pain-free undergraduates

Ian A Boggero  1   2 , Suzanne C Segerstrom  1
Affiliations

Self-regulatory ability, fatigue, and the experience of pain: Mechanistic insights from pain-free undergraduates

Ian A Boggero et al. Psychophysiology. 2019 Sep.

Abstract

Self-regulatory (SR) ability is an important resource for managing pain, but chronic pain patients experience chronic self-regulatory fatigue even when they are not in pain. Pressure pain thresholds (PPT) and pain inhibition are two mechanisms that differentiate people with and without chronic pain. It was hypothesized that trait SR ability would be associated with higher PPT and better pain inhibition and that PPT and pain inhibition would be lower following high versus low SR fatigue. Three studies tested these hypotheses. Study 1 had 240 pain-free undergraduates complete measures of trait SR ability and PPT; 122 also provided data on pain inhibition. Study 2 had 38 of Study 1's participants return for two additional sessions in which they underwent PPT testing under conditions of high or low SR fatigue (within-person, counterbalanced). Study 3 repeated these procedures with pain inhibition as the outcome (n = 39). Results revealed that individual differences in SR ability were not associated with PPT or pain inhibition (all ps > 0.05). Within people, neither PPT (F(1, 36) = 1.57, p = 0.22) nor pain inhibition (F(1, 37) = 1.79, p = 0.19) were significantly different under conditions of low versus high SR fatigue. Results do not support the hypotheses that PPT or pain inhibition associate with individual differences in trait SR ability or transient changes in state SR fatigue in the absence of pain. Instead, the SR deficits in chronic pain patients may arise from the experience of chronic pain.

Keywords: fatigue; heart rate variability; pain; young adults.

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Conflict of interest statement

The Authors declare that there is no conflict of interest.

Figures

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Figure 1
Flowchart of Participants and Tasks
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