• Analysing mHealth usage logs in RCTs: Explaining participants’ interactions with type 2 diabetes self-management tools 

      Bradway, Meghan; Pfuhl, Gerit; Joakimsen, Ragnar Martin; Ribu, Lis; Grøttland, Astrid; Årsand, Eirik (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-30)
      <p><i>Background</i>: The Introduction of mobile health (mHealth) devices to health intervention studies challenges us as researchers to adapt how we analyse the impact of these technologies. For interventions involving chronic illness self-management, we must consider changes in behaviour in addition to changes in health. Fortunately, these mHealth technologies can record participants’ interactions ...
    • The association between timed up and go test and history of falls : The Tromsø study 

      Joakimsen, Ragnar Martin; Thornquist, Eline; Thrane, Gyrd (Journal article; Tidsskriftartikkel; Peer reviewed, 2007-01-12)
      Background: Fall-related injuries in older adults are a major health problem. Although the aetiology of falls is multifactorial, physical factors are assumed to contribute significantly. The "Timed up and go test" (TUG) is designed to measure basic mobility function. This report evaluates the association between TUG times and history of falls. Methods: A retrospective, observational, population-based ...
    • Bone mineral density is associated with Vitamin D related rs6013897 and estrogen receptor polymorphism rs4870044: The Tromsø study 

      Martinaityte, Ieva; Jorde, Rolf; Emaus, Nina; Eggen, Anne Elise; Joakimsen, Ragnar Martin; Kamycheva, Elena (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-03-02)
      Background:<br>Bone mineral density (BMD) is determined by bone remodeling processes regulated by endocrine, autocrine and genetic mechanisms. Thus, some studies have reported that BMD is associated with single nucleotide polymorphisms (SNPs) associated with vitamin D receptor (VDR), serum 25(OH)D levels and estrogen receptor 1 (ESR1), but without consensus. Therefore, we aimed to map and compare ...
    • The DBP Phenotype Gc-1f/Gc-1f is associated with reduced risk of cancer. The Tromsø Study 

      Jorde, Rolf; Schirmer, Henrik; Wilsgaard, Tom; Mathiesen, Ellisiv B.; Løchen, Maja-Lisa; Joakimsen, Ragnar Martin; Grimnes, Guri (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-05-18)
      Background and Objective In addition to its role as a transport protein, the vitamin D binding protein (DBP) may also affect lipid metabolism, inflammation and carcinogenesis. There are three common variants of the DBP, Gc1s (1s), Gc1f (1f), Gc2 (2) that result in six common phenotypes (1s/1s, 1s/ 1f, 1s/2, 1f/1f, 1f/2, and 2/2). These phenotypes can be identified by genotyping for the two single ...
    • Does it make sense to use written instruments to assess communication skills? Systematic review on the concurrent and predictive value of written assessment for performance 

      Kiessling, Claudia; Perron, Noelle Junod; van Nuland, Marc; Bujnowska-Fedak, Maria Magdalena; Essers, Geurt; Joakimsen, Ragnar Martin; Pype, Peter; Tsimtsiou, Zoi (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-23)
      Objectives - To evaluate possible associations between learners’ results in written and performance-based assessments of communication skills (CS), either in concurrent or predictive study designs.<p> <p>Methods - Search included four databases for peer-reviewed studies containing both written and performance-based CS assessment. Eleven studies met the inclusion criteria.<p> <p>Results - ...
    • Effect of a Fracture Liaison Service on the Rate of Subsequent Fracture Among Patients With a Fragility Fracture in the Norwegian Capture the Fracture Initiative (NoFRACT) 

      Andreasen, Camilla; Solberg, Lene Bergendal; Basso, Trude; Borgen, Tove Tveitan; Dahl, Cecilie; Wisløff, Torbjørn; Hagen, Gunhild; Apalset, Ellen M; Gjertsen, Jan-Erik; Figved, Wender; Hübschle, Lars Michael; Stutzer, Jens-Meinhard; Elvenes, Jan; Joakimsen, Ragnar Martin; Syversen, Unni; Eriksen, Erik Fink; Nordsletten, Lars; Frihagen, Frede Jon; Omsland, Tone Kristin; Bjørnerem, Åshild (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-07)
      <p><i>Importance</i>: Fragility fracture is a major health issue because of the accompanying morbidity, mortality, and financial cost. Despite the high cost to society and personal cost to affected individuals, secondary fracture prevention is suboptimal in Norway, mainly because most patients with osteoporotic fractures do not receive treatment with antiosteoporotic drugs after fracture ...
    • Effect of genetically low 25-hydroxyvitamin D on mortality risk: Mendelian randomization analysis in 3 large European cohorts 

      Aspelund, Thor; Grübler, Martin R.; Smith, Albert V.; Gudmundsson, Elias F.; Keppel, Martin; Cotch, Mary Frances; Harris, Tamara B.; Jorde, Rolf; Grimnes, Guri; Joakimsen, Ragnar Martin; Schirmer, Henrik; Wilsgaard, Tom; Mathiesen, Ellisiv B.; Njølstad, Inger; Løchen, Maja-Lisa; März, Winfried; Kleber, Marcus E.; Tomaschitz, Andreas; Grove-Laugesen, Diana; Rejnmark, Lars; Swart, Karin M.A.; Brouwer, Ingeborg A.; Lips, Paul; van Schoor, Natasja M.; Sempos, Christopher T.; Durazo-Arvizu, Ramón A.; Škrabáková, Zuzana; Dowling, Kirsten G.; Cashman, Kevin D.; Kiely, Mairead; Pilz, Stefan; Gudnason, Vilmundur; Eiríksdóttir, Gudny (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-02)
      The aim of this study was to determine if increased mortality associated with low levels of serum 25-hydroxyvitamin D (25(OH)D) reflects a causal relationship by using a Mendelian randomisation (MR) approach with genetic variants in the vitamin D synthesis pathway. Individual participant data from three European cohorts were harmonized with standardization of 25(OH)D according to the Vitamin D ...
    • Effects of vitamin D supplementation on bone turnover markers and other bone-related substances in subjects with vitamin D deficiency 

      Jorde, Rolf; Stunes, Astrid Kamilla; Kubiak, Julia Magdalena; Joakimsen, Ragnar Martin; Grimnes, Guri; Thorsby, Per Medbøe; Syversen, Unni (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-05)
      In observational studies, vitamin D deficiency is a risk factor for low bone density and future fractures, whereas a causal relation has been difficult to show in randomized controlled trials (RCTs). Similarly, vitamin D deficiency has been associated with increased bone turnover, but RCTs with vitamin D have not shown conclusive effects. This could be due to inclusion of vitamin D sufficient subjects ...
    • Effects of Age and Sex on Estimated Diabetes Prevalence Using Different Diagnostic Criteria: The Tromso OGTT Study 

      Hutchinson, Moira Strand; Joakimsen, Ragnar Martin; Njølstad, Inger; Schirmer, Henrik; Figenschau, Yngve Anton; Svartberg, Johan; Jorde, Rolf (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Hb 6.5% has recently been recommended as an alternative diagnostic criterion for diabetes. The aims of the study were to evaluate the effects of age, sex, and other factors on prevalence of diabetes and to compare risk profiles of subjects with diabetes when defined by Hb and glucose criteria. Subjects were recruited among participants in the longitudinal population-based Tromsø Study. Hb , fasting ...
    • Estimated Glomerular Filtration Rate (eGFR) based on cystatin C was associated with increased risk of hip and proximal humerus fractures in women and decreased risk of hip fracture in men, whereas eGFR based on creatinine was not associated with fracture risk in both sexes: The Tromsø Study 

      Nordvåg, Sofie; Solbu, Marit Dahl; Melsom, Toralf; Nissen, Frida Igland; Andreasen, Camilla; Borgen, Tove Tveitan; Eriksen, Bjørn Odvar; Joakimsen, Ragnar Martin; Bjørnerem, Åshild (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-14)
      <i>Purpose</i> - Patients with end-stage kidney disease have an increased fracture risk. Whether mild to moderate reductions in kidney function is associated with increased fracture risk is uncertain. Results from previous studies may be confounded by muscle mass because of the use of creatinine-based estimates of the glomerular filtration rate (eGFRcre). We tested the hypothesis that lower eGFR ...
    • External Validation of the Garvan Nomograms for Predicting Absolute Fracture Risk: The Tromsø Study 

      Ahmed, Luai Awad; Nguyen, ND; Bjørnerem, Åshild; Joakimsen, Ragnar Martin; Jørgensen, Lone; Størmer, Jan; Bliuc, D; Center, Jacqueline R; Eisman, John; Nguyen, Tuan; Emaus, Nina (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
    • Genetic variations in the Vitamin D receptor predict type 2 diabetes and myocardial infarction in a community-based population: The tromsø study 

      Zostautiene, Leva; Jorde, Rolf; Schirmer, Henrik; Mathiesen, Ellisiv B.; Njølstad, Inger; Løchen, Maja-Lisa; Wilsgaard, Tom; Joakimsen, Ragnar Martin; Kamycheva, Elena (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-12-23)
      Background Though the associations between low serum 25-hydroxyvitamin D (25(OH)D) levels and health outcomes such as type 2 diabetes (T2D), myocardial infarction (MI), cancer, and mortality are well-studied, the effect of supplementation with vitamin D is uncertain. This may be related to genetic differences. Thus, rs7968585, a single nucleotide polymorphism (SNP) of the vitamin D receptor ...
    • Hoffmann´s syndrome necessitating forearm fasciotomy: a case report 

      Aarsæther, Erling Johan; Joakimsen, Ragnar Martin; Halvorsen, Hanne; Sildnes, Trude; Sivertsen, Olav; Due, Jan (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-02)
      <i>Background</i> - Hoffmann’s syndrome is a rare form of hypothyroid myopathy. Only a few cases of fasciotomy in this setting have previously been reported.<p><p> <i>Case presentation</i> - A 41-year-old Caucasian man under treatment for hypothyroidism presented with acute-onset severe pain in his forearm for no obvious reason and was admitted to our emergency room. He eventually developed ...
    • Leisure time physical activity and risk of non-vertebral fracture in men and women aged 55 years and older : the Tromso Study 

      Morseth, Bente; Ahmed, Luai A.; Bjørnerem, Åshild; Emaus, Nina; Jacobsen, Bjarne Koster; Joakimsen, Ragnar Martin; Størmer, Jan; Wilsgaard, Tom; Jørgensen, Lone (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      Our aim was to examine associations between leisure time physical activity and risk of non-vertebral fractures in men and women aged ≥55 years, with focus on the anatomical fracture location. Self-reported physical activity was registered in 3,450 men and 4,072 women aged 55–97 years at baseline in the Tromsø Study, Norway, in 1994–1995. Non-vertebral fractures were registered through December 31, ...
    • Measurement of cortical porosity of the proximal femur improves identification of women with nonvertebral fragility fractures 

      Ahmed, Luai Awad; Shigdel, Rajesh; Joakimsen, Ragnar Martin; Eldevik, Odd Petter; Eriksen, Erik Fink; Ghasem-Zadeh, Ali; Bala, Yohann; Zebaze, Roger; Seeman, Ego; Bjørnerem, Åshild (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-04-16)
      Summary We tested whether cortical porosity of the proximal femur measured using StrAx1.0 software provides additional information to areal bone mineral density (aBMD) or Fracture Risk Assessment Tool (FRAX) in differentiating women with and without fracture. Porosity was associated with fracture independent of aBMD and FRAX and identified additional women with fractures than by osteoporosis or ...
    • Measuring the effects of sharing mHealth data during diabetes consultations: a mixed-method study protocol 

      Bradway, Meghan; Giordanengo, Alain; Joakimsen, Ragnar Martin; Hansen, Anne Helen; Grøttland, Astrid; Hartvigsen, Gunnar; Randine, Pietro; Årsand, Eirik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-10)
      <i>Background</i>: There is rising demand for health care’s limited resources. Mobile health (mHealth) could be a solution, especially for those with chronic illnesses such as diabetes. mHealth can increases patients’ options to self-manage their health, improving their health knowledge, engagement, and capacity to contribute to their own care decisions. However, there are few solutions for sharing ...
    • Methods and Measures Used to Evaluate Patient-Operated Mobile Health Interventions: Scoping Literature Review 

      Bradway, Meghan; Gabarron, Elia; Johansen, Monika Alise; Zanaboni, Paolo; Jardim, Patricia; Joakimsen, Ragnar Martin; Pape-Haugaard, Louise; Årsand, Eirik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-30)
      <i>Background</i>: Despite the prevalence of mobile health (mHealth) technologies and observations of their impacts on patients’ health, there is still no consensus on how best to evaluate these tools for patient self-management of chronic conditions. Researchers currently do not have guidelines on which qualitative or quantitative factors to measure or how to gather these reliable data.<p><p> ...
    • Model-driven diabetes care: study protocol for a randomized controlled trial 

      Skrøvseth, Stein Olav; Årsand, Eirik; Godtliebsen, Fred; Joakimsen, Ragnar Martin (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Background: People with type 1 diabetes who use electronic self-help tools register a large amount of information about their disease on their participating devices; however, this information is rarely utilized beyond the immediate investigation. We have developed a diabetes diary for mobile phones and a statistics-based feedback module, which we have named Diastat, to give data-driven feedback ...
    • The phosphodiesterase 8B gene rs4704397 is associated with thyroid function, risk of myocardial infarction and body height. The Tromsø Study 

      Jorde, Rolf; Schirmer, Henrik; Wilsgaard, Tom; Joakimsen, Ragnar Martin; Mathiesen, Ellisiv B.; Njølstad, Inger; Løchen, Maja-Lisa; Figenschau, Yngve Anton; Svartberg, Johan; Hutchinson, Moira Strand; Kjærgaard, Marie; Jørgensen, Lone; Grimnes, Guri (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      Objective: High serum thyrotropin (TSH) levels predict cardiovascular disease (CVD). Recently several single nucleotide polymorphisms (SNPs) associated with TSH levels have been identified, one of them being the rs4704397 SNP in the phosphodiesterase 8B (PDE8B) gene. If the relation between thyroid function and CVD is causal, one could also expect rs4704397 genotypes to predict CVD and possibly ...
    • Plasma profile of microRNA after supplementation with high doses of vitamin D3 for 12 months 

      Jorde, Rolf; Svartberg, Johan; Joakimsen, Ragnar Martin; Coucheron, Dag-Hugo (Journal article; Tidsskriftartikkel; Peer reviewed, 2012-05-17)
      Background: Recently a large number of short non-coding-RNAs (microRNAs, (miRNA)) have been identified. These miRNAs act as post-transcriptional regulators where they generally have an inhibitory function. miRNAs are present in all human cells, and they are also detected in serum or plasma. The miRNAs have a broad range of actions, and their biogenesis must therefore be under tight control. One ...