Blar i Bergen Open Research Archive på forfatter "Gjerstad, Johannes"
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The 5-HTTLPR rs25531 LALA-genotype increases the risk of insomnia symptoms among shift workers
Pallesen, Ståle; Jacobsen, Daniel Pitz; Nielsen, Morten Birkeland; Gjerstad, Johannes (Peer reviewed; Journal article, 2019)Background Previous studies indicate that shift work tolerance may be associated with individual factors including genetic variability in the gene encoding the serotonin transporter 5-HTT (SLC6A4). The present study aimed ... -
Alcohol use among Norwegian workers: Associations with health and well-being
Nielsen, Morten Birkeland; Gjerstad, Johannes; Frone, Michael (Peer reviewed; Journal article, 2018-03)Background There is a lack of published data on the association between alcohol consumption and health and well-being in working populations. Aims To determine how levels of alcohol consumption are associated with psychological ... -
Associations between exposure to workplace bullying and insomnia: a cross-lagged prospective study of causal directions
Nielsen, Morten Birkeland; Pallesen, Ståle; Einarsen, Ståle; Harris, Anette; Rajalingam, Dhaksshaginy; Gjerstad, Johannes (Journal article; Peer reviewed, 2021)Objective Workplace bullying has been established as a significant correlate of sleep problems. However, little is known regarding the causal direction between bullying and sleep. The aim of this study was to examine ... -
Dispositional affect as a moderator in the relationship between role conflict and exposure to bullying behaviors
Reknes, Iselin; Einarsen, Ståle; Gjerstad, Johannes; Nielsen, Morten Birkeland (Peer reviewed; Journal article, 2019-01-24)Stressors in the work environment and individual dispositions among targets have been established separately as antecedents and risk factors of workplace bullying. However, few studies have examined these stressors in ... -
Does ability to defend moderate the association between exposure to bullying and symptoms of anxiety?
Nielsen, Morten Birkeland; Gjerstad, Johannes; Jacobsen, Daniel Pitz; Einarsen, Ståle Valvatne (Peer reviewed; Journal article, 2017-11-07)In the context of workplace bullying, the ability to defend refers to whether or not a target feels able to deal with those negative behaviors that typically constitute bullying. The aim of this study was to determine ... -
Exposure to workplace bullying, distress, and insomnia. The moderating role of the miR-146a genotype
Rajalingam, Dhaksshaginy; Jacobsen, Daniel Pitz; Nielsen, Morten Birkeland; Einarsen, Ståle; Gjerstad, Johannes (Peer reviewed; Journal article, 2019-05-24)Several lines of evidence show that systematic exposure to negative social acts at the workplace i.e., workplace bullying, results in symptoms of depression and anxiety among those targeted. However, little is known about ... -
Exposure to workplace bullying, microRNAs and pain. Evidence of a moderating effect of miR-30c rs928508 and miR-223 rs3848900
Jacobsen, Daniel Pitz; Eriksen, Mina Baarnes; Rajalingam, Dhaksshaginy; Nymoen, Ingeborg; Nielsen, Morten Birkeland; Einarsen, Ståle; Gjerstad, Johannes (Peer reviewed; Journal article, 2019)Prolonged exposure to bullying behaviors may give rise to symptoms such as anxiety, depression and chronic pain. Earlier data suggest that these symptoms often are associated with stress-induced low-grade systemic inflammation. ... -
Expression of ANK3 moderates the association between childhood trauma and affective traits in severe mental disorders
Aas, Monica; Andreassen, Ole; Gjerstad, Johannes; Rødevand, Linn; Hjell, Gabriela; Johansen, Ingrid Torp; Lunding, Synve Hoffart; Ormerod, Monica Bettina E. Greenwood; Lagerberg, Trine Vik; Steen, Nils Eiel; Djurovic, Srdjan; Akkouh, Ibrahim Ahmed (Journal article; Peer reviewed, 2023)Exposure to early life trauma increases the risk of psychopathology later in life. Here we investigated if ANK3 mRNA levels influence the relationship between childhood trauma experiences and clinical characteristics in ... -
The impact of follower leadership position on transformational leadership as moderator of the association between work-related ambiguity and job satisfaction
Nielsen, Morten Birkeland; Hetland, Jørn; Harris, Anette Kristoffersen; Notelaers, Guy Louis Alice; Gjerstad, Johannes; Einarsen, Ståle Valvatne (Journal article; Peer reviewed, 2022)This two-part study examined if the buffering effect of transformational leadership on the association between work-related ambiguity and job satisfaction is contingent upon whether a follower holds a formal leadership ... -
Mapping of pituitary stress-induced gene regulation connects Nrcam to negative emotions
Olsen, Maria Belland; Sannes, Ann-Christin; Yang, Kuan; Nielsen, Morten Birkeland; Einarsen, Ståle Valvatne; Christensen, Jan Olav; Pallesen, Ståle; Bjørås, Magnar; Gjerstad, Johannes (Journal article; Peer reviewed, 2022)Environmental stressors such as repeated social defeat may initiate powerful activation of subconscious parts of the brain. Here, we examine the consequences of such stress (induced by resident-intruder paradigm) on the ... -
The Moderating Role of Transformational Leadership in the Relationships between Job Demands and Turnover Intentions
Nielsen, Morten Birkeland; Gjerstad, Johannes; Einarsen, Ståle Valvatne (Journal article; Peer reviewed, 2023)There is a shortage of knowledge about how different job demands influence turnover among employees. This study determines cross-sectional and prospective associations between challenge demands (quantitative demands), ... -
Negative social acts and pain. Evidence of a workplace bullying and 5-HTT genotype interaction
Jacobsen, Daniel Pitz; Nielsen, Morten Birkeland; Einarsen, Ståle; Gjerstad, Johannes (Journal article; Peer reviewed, 2018)Objectives: Long-term exposure to systematic negative acts at work, usually labeled workplace bullying, is a prevalent problem at many workplaces. The adverse effects of such exposure may range from psychological symptoms, ... -
Preventing and Neutralizing the Escalation of Workplace Bullying. The Role of Conflict Management Climate
Hamre, Kristina Vaktskjold; Fauske, Margrethe Ringen; Reknes, Iselin; Nielsen, Morten Birkeland; Gjerstad, Johannes; Einarsen, Ståle Valvatne (Journal article; Peer reviewed, 2021)Workplace bullying is, by definition, a gradually escalating process, theorized to occur from psychosocial stressors when there is a lack of management intervention in escalating conflicts, and a lack of fair and robust ... -
Repeated social defeat promotes persistent inflammatory changes in splenic myeloid cells; decreased expression of β-arrestin-2 (ARRB2) and increased expression of interleukin-6 (IL-6)
Rajalingam, Dhaksshaginy; Nymoen, Ingeborg; Jacobsen, Daniel Pitz; Eriksen, Mina Baarnes; Dissen, Erik; Nielsen, Morten Birkeland; Einarsen, Ståle; Gjerstad, Johannes (Journal article; Peer reviewed, 2020)Background Previous studies suggest that persistent exposure to social stress in mammals may be associated with multiple physiological effects. Here, we examine the effects of social stress in rats, i.e. repeated social ... -
The role of leadership practices in the relationship between role stressors and exposure to bullying behaviours – a longitudinal moderated mediation design
Ågotnes, Kari Wik; Nielsen, Morten Birkeland; Skogstad, Anders; Gjerstad, Johannes; Einarsen, Ståle Valvatne (Journal article; Peer reviewed, 2023)Role conflicts and role ambiguity have been identified as important risk factors for exposure to workplace bullying, particularly when combined with inadequate leadership practices. Even though role ambiguity theoretically ... -
Workplace bullying increases the risk of anxiety through a stress‑induced β2‑adrenergic receptor mechanism: a multisource study employing an animal model, cell culture experiments and human data
Rajalingam, Dhaksshaginy; Nymoen, Ingeborg; Nyberg, Henriette; Nielsen, Morten Birkeland; Einarsen, Ståle Valvatne; Gjerstad, Johannes (Journal article; Peer reviewed, 2021)Objectives Several studies show that severe social stressors, e.g., in the form of exposure to workplace bullying in humans, is associated with negative mental health effects such as depression and anxiety among those ...