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AbstractAimsSleep restriction (SR) increases pain sensitivity. The aim of this study was to compare the effects of night work on pain sensitivity with experimental SR.MethodsIn study I 22 healthy volunteers (14 females) and in study II 24 nurses (17 females) received pain stimuli in the laboratory twice; after 2 nights with habitual sleep (study I and II) and after 2 nights of experimental 50% SR (study I) or after 2 nights of work (study II). Order of sleep conditions was randomized. Heat pain at intensity 6/10 (pain-6), the pressure pain threshold (PPT), and subjective sleepiness with Karolinska sleepiness scale (KSS) were assessed. A linear mixed model (LMM) with random intercept and random slope was used. Difference scores were compared between study I and II by independent t-tests (PPT and pain-6) and the Mann–Whitney U test (KSS).ResultsBaseline subjective sleepiness (KSS), PPT or pain-6 ratings did not differ between study I and II (p > 0.47). KSS and heat pain ratings increased after both sleep conditions (p < 0.001), but did not differ between study I and II (p > 0.15). PPT was lower after experimental SR (p = 0.007), but unchanged after night work (p = 0.63), but did not differ between study I and II (p = 0.16).ConclusionsBoth experimental and night work-induced SR leads to comparable increased subjective sleepiness and higher pain ratings to heat pain stimuli. PPT was lower after experimental SR, but was not affected by night work-induced SR.
Scandinavian Journal of Pain – de Gruyter
Published: Jul 1, 2015
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