Browsing SINTEF Open by Author "Tjønnås, Johannes"
Now showing items 1-7 of 7
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A multi-sensor system for automatic analysis of classical cross-country skiing techniques
Seeberg, Trine Margrethe; Tjønnås, Johannes; Rindal, Ole Marius Hoel; Haugnes, Pål; Dalgard, Steffen Harald; Sandbakk, Øyvind (Journal article; Peer reviewed, 2017)Commercial systems utilizing data from inertial measurement units (IMUs) to analyse movement patterns have not yet been adapted to monitor daily training in cross-country (XC) skiing. The main purposes of this study are ... -
Assessment of Basic Motions and Technique Identification in Classical Cross-Country Skiing
Tjønnås, Johannes; Trine, Seeberg; Rindal, Ole Marius Hoel; Haugnes, Pål; Sandbakk, Øyvind (Journal article; Peer reviewed, 2019)Cross-country skiing is a popular Olympic winter sport, which is also used extensively as a recreational activity. While cross-country skiing primarily is regarded as a demanding endurance activity it is also technically ... -
Automatic Classification of Sub-Techniques in Classical Cross-Country Skiing Using a Machine Learning Algorithm on Micro-Sensor Data
Rindal, Ole Marius Hoel; Seeberg, Trine Margrethe; Tjønnås, Johannes; Haugnes, Pål; Sandbakk, Øyvind (Journal article; Peer reviewed, 2018)The automatic classification of sub-techniques in classical cross-country skiing provides unique possibilities for analyzing the biomechanical aspects of outdoor skiing. This is currently possible due to the miniaturization ... -
Performance Effects of Video- and Sensor-Based Feedback for Implementing a Terrain-Specific Micropacing Strategy in Cross-Country Skiing
Seeberg, Trine Margrethe; Kocbach, Jan; Talsnes, Rune Kjøsen; Meyer, Frederic; Losnegard, Thomas Johansen; Tjønnås, Johannes; Sandbakk, Øyvind; Solli, Guro Strøm (Peer reviewed; Journal article, 2022)Purpose: To investigate the performance effects of video- and sensor-based feedback for implementing a terrain-specific micropacing strategy in cross-country (XC) skiing. Methods: Following a simulated 10-km skating ... -
Physiological and Biomechanical Determinants of Sprint Ability Following Variable Intensity Exercise When Roller Ski Skating
Seeberg, Trine Margrethe; Kocbach, Jan; Danielsen, Jørgen; Noordhof, Dionne; Skovereng, Knut; Hatling Haugnes, Pål; Tjønnås, Johannes; Sandbakk, Øyvind Bucher (Peer reviewed; Journal article, 2021)The most common race format in cross-country (XC) skiing is the mass-start event, which is under-explored in the scientific literature. To explore factors important for XC skiing mass-starts, the main purpose of this study ... -
Simple near well models for fast generation of dynamic GOR
Tjønnås, Johannes; Schjølberg, Ingrid (Research report, 2011)This report presents the use of auto regressive models as simplified near well models for fast online generation of rate dependent gas oil ratios (GOR) used in offline and real time production optimization and reservoir ... -
Vind: a robot self-localization framework
Azpiazu, Jon; Bjerkeng, Magnus Christian; Tjønnås, Johannes; Grøtli, Esten Ingar (Chapter, 2016)