title: Increased power spectral density in resting-state pain-related brain networks in fibromyalgia.
abstract: Fibromyalgia (FM), characterized by chronic widespread pain, is known to be associated with heightened responses to painful stimuli and atypical resting-state functional connectivity among pain-related regions of the brain. Previous studies of FM using resting-state functional magnetic resonance imaging (rs-fMRI) have focused on intrinsic functional connectivity, which maps the spatial distribution of temporal correlations among spontaneous low-frequency fluctuation in functional MRI (fMRI) resting-state data. In the current study, using rs-fMRI data in the frequency domain, we investigated the possible alteration of power spectral density (PSD) of low-frequency fluctuation in brain regions associated with central pain processing in patients with FM. rsfMRI data were obtained from 19 patients with FM and 20 age-matched healthy female control subjects. For each subject, the PSDs for each brain region identified from functional connectivity maps were computed for the frequency band of 0.01 to 0.25 Hz. For each group, the average PSD was determined for each brain region and a 2-sample t test was performed to determine the difference in power between the 2 groups. According to the results, patients with FM exhibited significantly increased frequency power in the primary somatosensory cortex (S1), supplementary motor area (SMA), dorsolateral prefrontal cortex, and amygdala. In patients with FM, the increase in PSD did not show an association with depression or anxiety. Therefore, our findings of atypical increased frequency power during the resting state in pain-related brain regions may implicate the enhanced resting-state baseline neural activity in several brain regions associated with pain processing in FM.
authors.affiliation: MD-PhD Program, Department of Medical Science, Kyungpook National University School of Medicine, Daegu, South Korea Division of Rheumatology, Inje University College of Medicine, Haeundae Paik Hospital, Busan, South Korea Department of Medical & Biological Engineering, Kyungpook National University, Daegu, South Korea Department of Internal Medicine, School of Medicine, Keimyung University, Daegu, South Korea Division of Rheumatology, Department of Internal Medicine, Daegu Fatima Hospital, Daegu, South Korea Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, South Korea Department of Internal Medicine, Arthritis and Autoimmunity Research Center, Catholic University of Daegu School of Medicine, Daegu, South Korea Department of Radiology, Kyungpook National University School of Medicine, Daegu, South Korea Department of Psychiatry, Kyungpook National University School of Medicine, Daegu, South Korea Department of Psychiatry, School of Medicine, Keimyung University, Daegu, South Korea Department of Molecular Medicine, Kyungpook National University School of Medicine, Daegu, South Korea.
authors.forename: Ji-Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Seong-Ho
authors.initials: SH
authors.lastname: Kim
authors.forename: Jeehye
authors.initials: J
authors.lastname: Seo
authors.forename: Sang-Hyon
authors.initials: SH
authors.lastname: Kim
authors.forename: Seung Woo
authors.initials: SW
authors.lastname: Han
authors.forename: Eon Jeong
authors.initials: EJ
authors.lastname: Nam
authors.forename: Seong-Kyu
authors.initials: SK
authors.lastname: Kim
authors.forename: Hui Joong
authors.initials: HJ
authors.lastname: Lee
authors.forename: Seung-Jae
authors.initials: SJ
authors.lastname: Lee
authors.forename: Yang-Tae
authors.initials: YT
authors.lastname: Kim
authors.forename: Yongmin
authors.initials: Y
authors.lastname: Chang
mesh_terms: D000328:Adult; D001921:Brain / Q000098:blood supply / Q000473:pathology*; D001931:Brain Mapping; D005260:Female; D005356:Fibromyalgia / Q000473:pathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000098:blood supply; D009434:Neural Pathways / Q000098:blood supply / Q000473:pathology*; D010100:Oxygen / Q000097:blood; D010147:Pain Measurement; D011581:Psychological Tests; D012146:Rest / Q000502:physiology*; D013057:Spectrum Analysis; D013223:Statistics as Topic
chemical_list: D010100:Oxygen
keywords: Fibromyalgia (FM); Pain; Power spectral density; Resting-state fMRI