Blar i Institutt for nevromedisin og bevegelsesvitenskap på forfatter "Olsen, Alexander"
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A biofeedback app for migraine: Development and usability study
Ingvaldsen, Sigrid Hegna; Tronvik, Erling Andreas; Brenner, Eiliv; Winnberg, Ingunn; Olsen, Alexander; Gravdahl, Gøril Bruvik; Stubberud, Anker (Peer reviewed; Journal article, 2021)Background: Biofeedback is effective in treating migraines. It is believed to have a beneficial effect on autonomous nervous system activity and render individuals resilient to stressors that may trigger a migraine. However, ... -
Biofeedback Treatment App for Pediatric Migraine: Development and Usability Study
Stubberud, Anker; Tronvik, Erling Andreas; Olsen, Alexander; Gravdahl, Gøril Bruvik; Linde, Mattias (Peer reviewed; Journal article, 2020)Objective The objective of this study was to develop and investigate the usability of a biofeedback treatment smartphone app for adolescent migraine sufferers. Background Biofeedback is effective in treating pediatric ... -
Chronic immunosuppression across 12 months and high ability of acute and subacute CNS-injury biomarker concentrations to identify individuals with complicated mTBI on acute CT and MRI
Clarke, Gerard Janez; Follestad, Turid; Skandsen, Toril; Zetterberg, Henrik; Vik, Anne; Blennow, Kaj; Olsen, Alexander; Håberg, Asta (Journal article; Peer reviewed, 2024)Background: Identifying individuals with intracranial injuries following mild traumatic brain injury (mTBI), i.e. complicated mTBI cases, is important for follow-up and prognostication. The main aims of our study were (1) ... -
Cognitive performance in DSWPD patients upon awakening from habitual sleep compared with forced conventional sleep
Solheim, Brandy; Olsen, Alexander; Kallestad, Håvard; Langsrud, Knut; Bjorvatn, Bjørn; Gradisar, Michael; Sand, Trond (Journal article; Peer reviewed, 2018)Difficult early morning awakening is one of the defining symptoms of delayed sleep–wake phase disorder. It is accompanied by low cognitive arousal and drowsiness resulting in difficulty concentrating and focusing attention ... -
Cognitive Reserve Moderates Cognitive Outcome After Mild Traumatic Brain Injury
Stenberg, Jonas; Håberg, Asta; Follestad, Turid; Olsen, Alexander; Iverson, Grant L.; Terry P., Douglas; Karlsen, Rune Hatlestad; Saksvik, Simen Berg; Karaliute, Migle; Ek, John Andre Nebb; Skandsen, Toril; Vik, Anne (Journal article; Peer reviewed, 2019)Objective To investigate whether cognitive reserve moderates differences in cognitive functioning between patients with mild traumatic brain injury (MTBI) and controls without MTBI and to examine whether patients with ... -
Cognitive Reserve Moderates Cognitive Outcome After Mild Traumatic Brain Injury
Stenberg, Jonas; Håberg, Asta; Follestad, Turid; Olsen, Alexander; Iverson, Grant L.; Terry P., Douglas; Karlsen, Rune Hatlestad; Saksvik, Simen Berg; Karaliute, Migle; Ek, John Andre Nebb; Skandsen, Toril; Vik, Anne (Peer reviewed; Journal article, 2019)Objective To investigate whether cognitive reserve moderates differences in cognitive functioning between patients with mild traumatic brain injury (MTBI) and controls without MTBI and to examine whether patients with ... -
Digital Technology Biofeedback for the Prophylaxis of Pediatric Migraine
Stubberud, Anker (Doctoral theses at NTNU;2020:204, Doctoral thesis, 2020) -
Examining 3-month test-retest reliability and reliable change using the Cambridge Neuropsychological Test Automated Battery
Karlsen, Rune Hatlestad; Karr, Justin E.; Saksvik, Simen Berg; Lundervold, Astri J.; Hjemdal, Odin; Olsen, Alexander; Iverson, Grant L.; Skandsen, Toril (Peer reviewed; Journal article, 2020)The Cambridge Neuropsychological Test Automated Battery (CANTAB) is a battery of computerized neuropsychological tests commonly used in Europe in neurology and psychiatry studies, including clinical trials. The purpose of ... -
Exercise Intensity-Dependent Effects on Cognitive Control Function during and after Acute Treadmill Running in Young Healthy Adults
Wohlwend, Martin Rainer; Olsen, Alexander; Håberg, Asta; Palmer, Helen (Journal article; Peer reviewed, 2017)The idea that physical activity differentially impacts upon performance of various cognitive tasks has recently gained increased interest. However, our current knowledge about how cognition is altered by acute physical ... -
Forecasting migraine with machine learning based on mobile phone diary and wearable data
Stubberud, Anker; Ingvaldsen, Sigrid Hegna; Brenner, Eiliv; Winnberg, Ingunn Grøntveit; Olsen, Alexander; Gravdahl, Gøril Bruvik; Matharu, Manjit Singh; Nachev, Parashkev; Tronvik, Erling Andreas (Peer reviewed; Journal article, 2023)Introduction Triggers, premonitory symptoms and physiological changes occur in the preictal migraine phase and may be used in models for forecasting attacks. Machine learning is a promising option for such predictive ... -
Frequency and predictors of headache in the first 12 months after traumatic brain injury: results from CENTER-TBI
Howe, Emilie Isager; Andelic, Nada; Brunborg, Cathrine; Zeldovich, Marina; Helseth, Eirik; Skandsen, Toril; Olsen, Alexander; Fure, Silje Christine Reistad; Theadom, Alice; Rauen, Katrin; Madsen, Benedikte Årebrot; Jacobs, Bram; van der Naalt, Joukje; Tartaglia, Maria Carmela; Einarsen, Cathrine Elisabeth; Storvig, Gøril; Tronvik, Erling Andreas; Tverdal, Cathrine Buaas; von Steinbüchel, Nicole; Røe, Cecilie; Hellstrøm, Torgeir (Journal article; Peer reviewed, 2024)Background: Headache is a prevalent and debilitating symptom following traumatic brain injury (TBI). Large-scale, prospective cohort studies are needed to establish long-term headache prevalence and associated factors after ... -
Life after adolescent and adult moderate and severe traumatic brain injury: self-reported executive, emotional, and behavioural function 2-5 years after injury
Finnanger, Torun Gangaune; Olsen, Alexander; Skandsen, Toril; Lydersen, Stian; Vik, Anne; Evensen, Kari A. Indredavik; Catroppa, Cathy; Håberg, Asta; Andersson, Stein; Indredavik, Marit Sæbø (Peer reviewed; Journal article, 2015)Survivors of moderate-severe Traumatic Brain Injury (TBI) are at risk for long-term cognitive, emotional, and behaviouralproblems. This prospective cohort study investigated self-reported executive, emotional, and behavioural ... -
Methodology Matters: Comparing Approaches for Defining Persistent Symptoms after Mild Traumatic Brain Injury
Karaliute, Migle; Saksvik, Simen Berg; Smevik, Hanne; Follestad, Turid; Einarsen, Cathrine Elisabeth; Vik, Anne; Håberg, Asta; Iverson, Grant L.; Skandsen, Toril; Olsen, Alexander (Peer reviewed; Journal article, 2021)Some people experience persistent post-concussion symptoms (PPCS) after mild traumatic brain injury (mTBI). A meaningful clinical classification and scientific progress are hampered by a lack of consensus regarding the ... -
Poorer sleep health is associated with altered brain activation during cognitive control processing in healthy adults
Smevik, Hanne; Habli, Sarah; Saksvik, Simen Berg; Kliem, Elisabeth; Evensmoen, Hallvard Røe; Conde, Virginia; Petroni, Agustin; Asarnow, Robert F.; Dennis, Emily L.; Eikenes, Live; Kallestad, Håvard; Sand, Trond Halfdan; Thompson, Paul M.; Saksvik-Lehouillier, Ingvild; Håberg, Asta; Olsen, Alexander (Peer reviewed; Journal article, 2023)This study investigated how proactive and reactive cognitive control processing in the brain was associated with habitual sleep health. BOLD fMRI data were acquired from 81 healthy adults with normal sleep (41 females, age ... -
Preterm birth leads to hyper-reactive cognitive control processing and poor white matter organization in adulthood
Olsen, Alexander; Dennis, Emily L; Evensen, Kari Anne Indredavik; Hollund, Ingrid Marie Husby; Løhaugen, Gro; Thompson, Paul M; Brubakk, Ann-Mari; Eikenes, Live; Håberg, Asta (Peer reviewed; Journal article, 2017)Individuals born preterm with very low birth weight (VLBW; birth weight ≤ 1500 g) are at high risk for perinatal brain injuries and deviant brain development, leading to increased chances of later cognitive, emotional, and ... -
The prevalence and stability of sleep-wake disturbance and fatigue throughout the first year after mild traumatic brain injury
Saksvik, Simen Berg; Karaliute, Migle; Kallestad, Håvard; Follestad, Turid; Asarnow, Robert F.; Vik, Anne; Håberg, Asta; Skandsen, Toril; Olsen, Alexander (Peer reviewed; Journal article, 2020)In this prospective, longitudinal study, we aimed to determine the prevalence and stability of sleep-wake disturbance (SWD) and fatigue in a large representative sample of patients (Trondheim mild traumatic brain injury ... -
The Relationship of Psychiatric Symptoms with Performance-Based and Self-Reported Cognitive Function After Ischemic Stroke
Kliem, Elisabeth; Gjestad, Elise Ødegård; Ryum, Truls; Olsen, Alexander; Thommessen, Bente; Indredavik, Bent; Bieliauskas, Linas; Due-Tønnessen, Paulina; Fladby, Tormod; Grambaite, Ramune (Peer reviewed; Journal article, 2021)Objective: Findings on the relationship of psychiatric symptoms with performance-based and self-reported cognitive function post-stroke are inconclusive. We aimed to (1) study the relation of depression and anxiety to ... -
Self-administered biofeedback treatment app for pediatric migraine: A randomized pilot study
Stubberud, Anker; Linde, Mattias; Brenner, Eiliv; Heier, Martin; Olsen, Alexander; Aamodt, Anne Hege; Gravdahl, Gøril Bruvik; Tronvik, Erling Andreas (Peer reviewed; Journal article, 2020)Objective To investigate the effect size, safety, and tolerability of a therapist‐independent biofeedback treatment app among adolescent with migraine. Materials and Methods This was a prospective, 3:1 ratio randomized, ... -
Self-reported cognitive and psychiatric symptoms at 3 months predict single-item measures of fatigue and daytime sleep 12 months after ischemic stroke
Kliem, Elisabeth; Labberton, Angela Susan; Barra, Mathias; Olsen, Alexander; Thommessen, Bente; Thomas, Owen Matthew Truscott; Gjestad, Elise Ødegård; Indredavik, Bent; Grambaite, Ramune (Peer reviewed; Journal article, 2022)Introduction: Post-stroke fatigue and increased need for daytime sleep are multidimensional and insufficiently understood sequelae. Our aim was to study the relationships of self-reported cognitive and psychiatric symptoms ... -
Self-reported cognitive and psychiatric symptoms at 3 months predict single-item measures of fatigue and daytime sleep 12 months after ischemic stroke
Kliem, Elisabeth; Labberton, Angela Susan; Barra, Mathias; Olsen, Alexander; Thommessen, Bente; Thomas, Owen Matthew Truscott; Gjestad, Elise Ødegård; Indredavik, Bent; Grambaite, Ramune (Peer reviewed; Journal article, 2022)Introduction: Post-stroke fatigue and increased need for daytime sleep are multidimensional and insufficiently understood sequelae. Our aim was to study the relationships of self-reported cognitive and psychiatric symptoms ...