• Daily associations between sleep and pain in patients with chronic musculoskeletal pain 

      Abeler, Karin; Bergvik, Svein; Sand, Trond; Friborg, Oddgeir (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-02)
      Patients with chronic pain commonly report sleep problems, and the evidence for a relationship between sleep disturbance and pain seems robust. The day‐to‐day associations between these constructs are less well studied, particularly with objective sleep measures such as actigraphy. Moreover, the concurrent presence of negative affective symptoms, as well as seasonality effects at extreme latitudes ...
    • Seasonality in pain, sleep and mental distress in patients with chronic musculoskeletal pain at latitude 69° N 

      Abeler, Karin; Sand, Trond; Friborg, Oddgeir; Bergvik, Svein (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-28)
      Seasonality is evident in several aspects of human health and behavior, whereas seasonality in chronic pain is less well studied. We examined seasonal variation in pain severity and pain dissemination, as well as in pain-associated conditions, such as sleep impairment, sleep timing, mental distress, fatigue and physical activity. We also examined if any of these associated conditions moderated the ...
    • Sleep Characteristics in Adults With and Without Chronic Musculoskeletal Pain. The Role of Mental Distress and Pain Catastrophizing 

      Abeler, Karin; Friborg, Oddgeir; Engstrøm, Morten; Sand, Trond; Bergvik, Svein (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-15)
      <p>Objectives: Sleep disturbance is associated with persistence and exacerbation of chronic pain. As this relationship seems to be bidirectional, factors underpinning sleep disturbance may prove important in multimodal rehabilitation approaches. The aim of this cross-sectional study was to examine the impact of psychological symptoms on subjective and objective sleep measures in patients with chronic ...