Academic article

• Roald Omdal; Tore Bjørn Grimstad; Grete Jonsson et al. (2026). Interleukin−1 receptor antagonist and heat shock protein 90alfa are independently associated with fatigue and general health in euthyroid Hashimoto’s thyroiditis. (external link)
• Ankana Banerjee; Ole Gunnar Aasprong; Emilius Adrianus Maria Janssen et al. (2026). REMIL-IBD: Region-filtered multiple instance learning for interpretable slide-level grading of inflammatory bowel disease. (external link)
• Roald Omdal; Ole Bernt Lenning; Grete Jonsson et al. (2026). Persistent fatigue in long-COVID is not associated with peripheral inflammatory or cellular stress biomarkers: A cross-sectional controlled study. (external link)
• Roald Omdal; Ole Bernt Lenning; Grete Jonsson et al. (2026). Long-COVID: assessment of circulating markers suggests no cerebral neuronal damage, neuroinflammation or systemic inflammation–a controlled study. (external link)
• Arne Carlsen; Øyvind Steinsbø; Jan Terje Kvaløy et al. (2025). Optimizing serum adalimumab levels in maintenance therapy via proactive therapeutic drug monitoring improves markers of disease activity in Crohn’s disease. (external link)
• Svein Oskar Frigstad; Marte Høivik; Jørgen Jahnsen et al. (2017). Vitamin D deficiency in inflammatory bowel disease: Prevalence and predictors in a Norwegian outpatient population. (external link)
• Lars-Petter Jelsness-Jørgensen; Bjørn Moum; Tore Grimstad et al. (2016). Validity, reliability, and responsiveness of the brief pain inventory in inflammatory bowel disease. (external link)
• Tore Grimstad; Katrine Brække Norheim; Kjetil Isaksen et al. (2015). Fatigue in Newly Diagnosed Inflammatory Bowel Disease.. (external link)
• Maria Boge Lauvsnes; Anne Bolette Tjensvoll; Stian Maroni et al. (2018). The blood-brain barrier, TWEAK, and neuropsychiatric involvement in human systemic lupus erythematosus and primary Sjögren's syndrome. (external link)
• Svein Oskar Frigstad; Marte Lie Høivik; Jørgen Jahnsen et al. (2018). Fatigue is not associated with vitamin D deficiency in inflammatory bowel disease patients. (external link)
• Øyvind Steinsbø; Ole Gunnar Aasprong; Lars Aabakken et al. (2025). Fecal Calprotectin Correlates with Disease Extent but Remains a Reliable Marker of Mucosal Healing in Ulcerative Colitis. (external link)
• Kristian Øgreid Leitao; Tore Grimstad; Michael Bretthauer et al. (2014). Polyethylene glycol vs sodium picosulfate/magnesium citrate for colonoscopy preparation. (external link)
• Kari Erichsen; Rune Johan Ulvik; Tore Grimstad et al. (2005). Effects of ferrous sulphate and non-ionic iron-polymaltose complex on markers of oxidative tissue damage in patients with inflammatory bowel disease. (external link)
• Randi Opheim; Bjørn Moum; Tore Grimstad et al. (2020). Self-esteem in patients with inflammatory bowel disease. (external link)
• Lars-Petter Jelsness-Jørgensen; Svein Oskar Frigstad; Bjørn Moum et al. (2017). Pain may be an important factor to consider in inflammatory bowel disease patients troubled by fatigue. (external link)
• Ole Bernt Lenning; Grete Jonsson; Tore Bjørn Grimstad et al. (2024). No signs of mast cell involvement in long-COVID: A case–control study. (external link)
• Tore Grimstad; Ingeborg Kvivik; Jan Terje Kvaløy et al. (2018). Heat shock protein 90 and inflammatory activity in newly onset Crohn’s disease. (external link)
• Tore Grimstad; Inger Marie Skoie; Jessica Doerner et al. (2016). TWEAK is not elevated in patients with newly diagnosed inflammatory bowel disease. (external link)
• Roald Omdal; Inger Marie Skoie; Tore Grimstad (2018). Fatigue is common and severe in patients with mastocytosis. (external link)
• Tore Grimstad; Arne Carlsen; Lars Normann Karlsen (2019). Medikamentell behandling ved fistulerende Crohns sykdom. (external link)
• Elin-johanne Katle; Jan Gunnar Hatlebakk; Tore Grimstad et al. (2017). Gastro-oesophageal reflux in patients with chronic rhino-sinusitis investigated with multichannel impedance - pH monitoring. (external link)
• Tore Grimstad; Ingeborg Kvivik; Jan Terje Kvaløy et al. (2019). Heat-shock protein 90α in plasma reflects severity of fatigue in patients with Crohn’s disease. (external link)
• Arne Carlsen; Tore Grimstad; Lars Normann Karlsen et al. (2019). A case of Menetriere's disease treated with the monoclonal antibody cetuximab. (external link)
• Ingeborg Kvivik; Tore Bjørn Grimstad; Kjetil Bårdsen et al. (2023). High mobility group box 1 and a network of other biomolecules influence fatigue in patients with Crohn’s disease. (external link)
• Arne Carlsen; Roald Omdal; Kristian Øgreid Leitao et al. (2018). Subtherapeutic concentrations of infliximab and adalimumab are associated with increased disease activity in Crohn's disease. (external link)
• Svein Oskar Frigstad; Marte Lie Høivik; Jørgen Jahnsen et al. (2020). Pain Severity and Vitamin D Deficiency in IBD Patients. (external link)
• Tore Grimstad; Katrine Brække Norheim; Jan Terje Kvaløy et al. (2016). Conventional treatment regimens for ulcerative colitis alleviate fatigue – an observational cohort study. (external link)
• Arne Carlsen; Roald Omdal; Lars Normann Karlsen et al. (2019). Determination of lower cut-off levels of adalimumab associated with biochemical remission in Crohn's disease. (external link)
• Tore Bjørn Grimstad; Arne Carlsen; Jan Terje Kvaløy et al. (2025). Fatigue in Inflammatory Bowel Disease: No Effect of Serum Concentrations of Infliximab, Adalimumab or Anti-Drug Antibodies During Maintenance Therapy. (external link)
• Øyvind Steinsbø; Arne Carlsen; Ole Gunnar Aasprong et al. (2022). Histologic healing and factors associated with complete remission following conventional treatment in ulcerative colitis. (external link)
• Tore Bjørn Grimstad; Berit Oterholm Mære; Jan Terje Kvaløy et al. (2021). The influence of disease activity on fatigue in patients with ulcerative colitis–a longitudinal study. (external link)
• Tore Grimstad; Bodil Bjørndal; Daniel Cacabelos et al. (2013). A salmon peptide diet alleviates experimental colitis as compared with fish oil. (external link)
• Tore Grimstad; Bodil Bjørndal; Daniel Cacabelos et al. (2012). Dietary supplementation of krill oil attenuates inflammation and oxidative stress in experimental ulcerative colitis in rats. (external link)
• Berit Oterholm Mære; Roald Omdal; Anne Kristine Hetta et al. (2023). Less, but not gone—gluten-free diet effects on fatigue in celiac disease: a prospective controlled study. (external link)
• Gülen Arslan Lied; Anne Marita Milde; Kim Nylund et al. (2012). Increased wall thickness using ultrasonography is associated with inflammation in an animal model of experimental colitis. (external link)
• Bodil Bjørndal; Tore Grimstad; Daniel Cacabelos et al. (2013). Tetradecylthioacetic acid attenuates inflammation and has antioxidative potential during experimental colitis in rats. (external link)
• Inger Marie Skoie; Kjetil Bårdsen; Mari Mæland Nilsen et al. (2021). Fatigue and expression of heat shock genes in plaque type psoriasis. (external link)
• Berit Mære Skjellerudsveen; Roald Omdal; Anne Kristine Hetta et al. (2022). Fatigue: a frequent and biologically based phenomenon in newly diagnosed celiac disease. (external link)
• Ingeborg Kvivik; Tore Bjørn Grimstad; Grete Jonsson et al. (2021). Anti-HMGB1 auto-Abs influence fatigue in patients with Crohn’s disease. (external link)
• Martine De Vos; Edouard Louis; Jørgen Jahnsen et al. (2013). Consecutive fecal calprotectin measurements to predict relapse in patients with ulcerative colitis receiving infliximab maintenance therapy. (external link)
• Jens Vikse; Daniel Limi Cacic; Arne Carlsen et al. (2016). En mann i 30-årene med ulcerøs kolitt og pancytopeni. (external link)
• Kjetil Isaksen; Lars Aabakken; Tore Grimstad et al. (2015). Hepatitt C-behandling ved tre norske sykehus 2000–11. (external link)
• Lars-Petter Jelsness-Jørgensen; Bjørn Allan Moum; Tore Bjørn Grimstad et al. (2022). The multidimensional fatigue inventory (MFI-20): psychometrical testing in a Norwegian sample of inflammatory bowel disease (IBD) patients. (external link)
• Tore Grimstad; Rolf Kristian Berge; Pavol Bohov et al. (2011). Salmon diet in patients with active ulcerative colitis reduced the simple clinical colitis activity index and increased the anti-infl ammatory fatty acid index – a pilot study. (external link)

Academic book chapter

• Roald Omdal; Tore Bjørn Grimstad (2025). Fatigue in clinical conditions: inflammatory bowel disease—a new narrative. (external link)

Conference poster

• Åse Margrete Sagen; Geir Egil Eide; Tore Bjørn Grimstad et al. (2025). Sammenheng mellom angst, depresjon og sykdomsaktivitet hos pasienter med nyoppdaget inflammatorisk tarmsykdom.. (external link)
• Svein Oskar Frigstad; Tomm Bernklev; Sandra Rinne Dahl et al. (2017). Vitamin D deficiency is not associated with chronic fatigue in inflammatory bowel disease. (external link)
• Randi Opheim; Tomm Bernklev; Jørgen Jahnsen et al. (2018). Chronic fatigue in patients with inflammatory bowel disease is associated with lower health–related quality of life, low self-esteem, increased anxiety and depression. (external link)
• Svein Oskar Frigstad; Marte Lie Høivik; Bjørn Moum et al. (2017). Vitamin D deficiency is not associated with depression in IBD patients. (external link)

Academic literature review

• Berit Oterholm Mære; Roald Omdal; Tore Grimstad (2019). Fatigue in celiac disease: A review of the literature. (external link)
• Ignacio Catalan-Serra; Petr Ricanek; Tore Bjørn Grimstad (2022). "Out of the box” new therapeutic strategies for Crohn´s disease: moving beyond biologics. (external link)
• Berit Oterholm Mære; Inger Marie Skoie; Ingvild Dalen et al. (2023). The Effect of Biological Treatment on Fatigue in Inflammatory Bowel Disease: A Systematic Review and Meta-analysis. (external link)
• Tore Grimstad; Katrine Brække Norheim (2016). Utmattelse ved inflammatorisk tarmsykdom. (external link)
• Jessica C. Young; Lise Mørkved Helsingen; Erle Refsum et al. (2025). Temporal trends in characteristics and management of inflammatory bowel disease. (external link)

Doctoral thesis (PhD)

• Tore Grimstad (2013). Anti-inflammatory effects of marine nutritional products in the treatment of ulcerative colitis. (external link)

Research report

• Hans Solli-Sæther; T Grimstad; Per Myrseth et al. (2008). Semantic and Organisational Interoperability in Communicating and Collaborating Organisations: State of the Art. (external link)

Conference lecture

• Svein Oskar Frigstad; Marte Lie Høivik; Milada C Småstuen et al. (2017). Fatigue er ikke assosiert med vitamin D mangel hos IBD pasienter. (external link)
• Tore Grimstad; Kim Nylund; Gülen Arsland Lied et al. (2011). Ultrasonographic evaluation of DSS-induced colitis in rats after dietary intake of a modified thia fatty acid. (external link)

Conference abstract

• Lars-Petter Jelsness-Jørgensen; Marte Lie Høivik; Bjørn Moum et al. (2015). Fatigue is associated with increased pain intensity and interference in IBD. (external link)
• Tore Grimstad; Trygve Hausken; Rolf Kristian Berge et al. (2007). Health effects from a regular intake of Atlantic salmon in patients with active ulcerative colitis. (external link)
• Svein Oskar Frigstad; Marte Lie Høivik; Jørgen Jahnsen et al. (2017). Vitamin D deficiency is not associated with depression in IBD patients. (external link)
• Svein Oskar Frigstad; Marte Lie Høivik; Jørgen Jahnsen et al. (2017). Fatigue is not Associated with Vitamin D Deficiency in IBD Patients. (external link)

Lecture

• Gülen Arsland Lied; Anne Marita Milde; Kim Nylund et al. (2011). A comparison between DSS- and TNBS induced colitis in rats on ultrasonographic intestinal changes: a pilot study. (external link)

See a complete overview of publications in NVA.