• Changes in adiposity, physical activity, cardiometabolic risk factors, diet, physical capacity and well-being in inactive women and men aged 57-74 years with obesity and cardiovascular risk – A 6-month complex lifestyle intervention with 6-month follow-up 

      Hopstock, Laila Arnesdatter; Deraas, Trygve Sigvart; Henriksen, André; Martiny-Huenger, Torsten; Grimsgaard, Sameline (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-25)
      A key challenge in lifestyle interventions is long-term maintenance of favorable lifestyle changes. Middle-aged and older adults are important target groups. The purpose of this analysis was to investigate changes in adiposity, physical activity, cardiometabolic risk factors, diet, physical capacity, and well-being, in inactive middle-aged and older women and men with obesity and elevated cardiovascular ...
    • Complex lifestyle intervention among inactive older adults with elevated cardiovascular disease risk and obesity: a mixed-method, single-arm feasibility study for RESTART—a randomized controlled trial 

      Deraas, Trygve Sigvart; Hopstock, Laila Arnesdatter; Henriksen, André; Morseth, Bente; Sand, Anne-Sofie; Njølstad, Inger; Pedersen, Sigurd; Sagelv, Edvard Hamnvik; Johansson, Jonas; Grimsgaard, Sameline (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-27)
      Background - Physical inactivity and obesity are global public health challenges. Older adults are important to target for prevention and management of disease and chronic conditions. However, many individuals struggle with maintaining increased physical activity (PA) and improved diet. This feasibility study provides the foundation for the RESTART trial, a randomized controlled trial (RCT) to test ...
    • Continuous physical activity recording - Consumer-based activity trackers in epidemiological studies 

      Henriksen, André (Doctoral thesis; Doktorgradsavhandling, 2021-06-04)
      Physical activity is an important modifiable lifestyle factor that can improve general health and reduce the risk of disease. Currently, collecting data on physical activity in epidemiological studies are generally limited to long-term but self-reported and inaccurate physical activity questionnaires and/or using short-term but objective and more accurate accelerometers. Consumer-based activity ...
    • Dataset of wearable sensors with possibilities for data exchange 

      Henriksen, André; Muzny, Miroslav; Giordanengo, Alain; Mužík, Jan; Grøttland, Astrid; Blixgård, Håvard Kvalvåg; Hartvigsen, Gunnar; Årsand, Eirik (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-12)
      We performed a search to identify available wearable sensors systems that can collect patient health data and have data sharing capabilities. Findings available in “Wearable sensors with possibilities for data exchange: Analyzing status and needs of different actors in mobile health monitoring systems”. We performed an initial search of the Vandrico wearable database, and supplemented the resulting ...
    • Evaluation of a Web-Based Dietary Assessment Tool (myfood24) in Norwegian Women and Men Aged 60-74 Years: Usability Study 

      Hopstock, Laila Arnesdatter; Medin, Anine Christine; Skeie, Guri; Henriksen, André; Lundblad, Marie Wasmuth (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-11)
      Background: A healthy diet throughout the life course improves health and reduces the risk of disease. There is a need for new knowledge of the relation between diet and health, but existing methods to collect information on food and nutrient intake have their limitations. Evaluations of new tools to assess dietary intake are needed, especially in old people, where the introduction of new technology ...
    • Factors Influencing Motivation and Engagement in Mobile Health Among Patients With Sickle Cell Disease in Low-Prevalence, High-Income Countries: Qualitative Exploration of Patient Requirements 

      Issom, David-Zacharie; Henriksen, André; Woldaregay, Ashenafi Zebene; Rochat, Jessica; Lovis, Christian; Hartvigsen, Gunnar (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-24)
      <i>Background</i>: Sickle cell disease (SCD) is a hematological genetic disease affecting over 25 million people worldwide. The main clinical manifestations of SCD, hemolytic anemia and vaso-occlusion, lead to chronic pain and organ damages. With recent advances in childhood care, high-income countries have seen SCD drift from a disease of early childhood mortality to a neglected chronic disease of ...
    • Measuring Physical Activity Using Triaxial Wrist Worn Polar Activity Trackers: A Systematic Review 

      Henriksen, André; Johansson, Jonas; Hartvigsen, Gunnar; Grimsgaard, Sameline; Hopstock, Laila Arnesdatter (Journal article; Tidsskriftartikkel; Peer reviewed, 2020)
      Collecting objective physical activity data from research participants are increasingly done using consumer-based activity trackers. Several validation studies of Polar devices are conducted to date, but no systematic review of the current level of accuracy for these devices exist. The aim of this study is therefore to investigate the accuracy of current wrist-worn Polar devices that equips a triaxial ...
    • mHealth Support to Stimulate Physical Activity in Individuals With Intellectual Disability: Protocol for a Mixed Methods Pilot Study 

      Michalsen, Henriette; Wangberg, Silje C; Hartvigsen, Gunnar; Henriksen, André; Jaccheri, Maria Letizia; Jahnsen, Reidun Birgitta; Thrane, Gyrd; Arntzen, Cathrine; Anke, Audny Gabriele Wagner (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-15)
      Background: Several studies have shown that individuals with intellectual disabilities (IDs) have low levels of physical activity (PA), and intervention studies on PA suggest inconsistent evidence. The use of technology as a means of motivation for PA has yet to be extensively explored and needs to be further investigated.<p> <p>Objective: We aim to assess the feasibility and acceptability of ...
    • Physical Activity With Tailored mHealth Support for Individuals With Intellectual Disabilities: Study Protocol for a Randomized Controlled Trial 

      Michalsen, Henriette; Wangberg, Silje C; Hartvigsen, Gunnar; Jaccheri, Maria Letizia; Muzny, Miroslav; Henriksen, André; Olsen, Monica Isabel; Thrane, Gyrd; Jahnsen, Reidun Birgitta; Pettersen, Gunn; Arntzen, Cathrine; Anke, Audny (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-29)
      <i>Background</i>: Individuals with intellectual disabilities (IDs) have lower levels of physical activity (PA) and greater barriers for participation in fitness activities compared with members of the general population. As increased PA has positive effects on cardiovascular and psychosocial health, it is exceedingly important to identify effective interventions for use in everyday settings. Mobile ...
    • A qualitative case study on agile practices and project success in agile software projects 

      Henriksen, André; Pedersen, Sven Arne R (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05)
      In project management, and particularly software project management, there has been a shift from traditional plan based project management, to the agile event driven project management style. This paper identifies some of the most important agile practices a team should use, to succeed in an agile software project. Four participants in two different projects were interviewed. 53 often used practices ...
    • Succeeding with prolonged usage ofconsumer-based activity trackers in clinicalstudies: a mixed methods approach 

      Henriksen, André; Sand, Anne-Sofie; Deraas, Trygve Sigvart; Grimsgaard, Sameline; Hartvigsen, Gunnar; Hopstock, Laila Arnesdatter (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-27)
      <i>Background</i> - Lack of physical activity (PA) is a risk factor for death and non-communicable disease. Despite this, more than one fourth of adults worldwide do not follow PA guidelines. As part of a feasibility study to test a complex intervention for increasing PA, we included a consumer-based activity tracker (AT) as a tool to measure PA outcomes and to track heart rate during exercise ...
    • Using cloud-based physical activity data from Google Fit and Apple HealthKit to expand recording of physical activity data in a population study 

      Henriksen, André; Hopstock, Laila Arnesdatter; Hartvigsen, Gunnar; Grimsgaard, Sameline (Journal article; Tidsskriftartikkel, 2017)
      Large population studies are important sources for medical research. These studies are well planned, well organized, and costly. However, people record health data themselves using different sensors, which are mostly unplanned, unorganized and inexpensive. Nevertheless, self-recorded data might be an important supplement to population studies. The question is how to access and use this data. In the ...
    • Using Fitness Trackers and Smartwatches to Measure Physical Activity in Research: Analysis of Consumer Wrist-Worn Wearables 

      Henriksen, André; Mikalsen, Martin Haugen; Woldaregay, Ashenafi Zebene; Muzny, Miroslav; Hartvigsen, Gunnar; Hopstock, Laila Arnesdatter; Grimsgaard, Sameline (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-03-22)
      Background: New fitness trackers and smartwatches are released to the consumer market every year. These devices are equipped with different sensors, algorithms, and accompanying mobile apps. With recent advances in mobile sensor technology, privately collected physical activity data can be used as an addition to existing methods for health data collection in research. Furthermore, data collected ...
    • Using mobile sensors to expand recording of physical activity and increase motivation for prolonged data sharing in a population-based study 

      Henriksen, André; Hartvigsen, Gunnar; Hopstock, Laila Arnesdatter; Grimsgaard, Sameline (Journal article; Tidsskriftartikkel; Peer reviewed, 2017)
      Regularly conducted population cohort studies contribute important new knowledge to medical research. A high participation rate is required in these types of studies in order to claim representativeness and validity of study results. Participation rates are declining worldwide, and re-searchers are challenged to develop new data collection strategies and tools to motivate people to participate. The ...
    • Validity of the Polar M430 Activity Monitor in Free-Living Conditions: Validation Study 

      Henriksen, André; Grimsgaard, Sameline; Horsch, Alexander; Hartvigsen, Gunnar; Hopstock, Laila Arnesdatter (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-16)
      <i>Background</i>: Accelerometers, often in conjunction with heart rate sensors, are extensively used to track physical activity (PA) in research. Research-grade instruments are often expensive and have limited battery capacity, limited storage, and high participant burden. Consumer-based activity trackers are equipped with similar technology and designed for long-term wear, and can therefore ...