Browsing NTNU Open by Author "Tjønnås, Johannes"
Now showing items 1-13 of 13
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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 ... -
Assessment of performance, physiological responses, and movement technique in cross-country skiing using sensor data
Seeberg, Trine Margrethe (Doctoral theses at NTNU;2023:328, Doctoral thesis, 2023)The main objective of this thesis was to investigate physiological responses, movement techniques, and their associations with training intensity and performance in cross-country skiing (XC) using sensor data, with a ... -
Automatic Calibration of Ship-mounted Cameras’ Extrinsic Parameters
Bjerkehagen, Daniel (Master thesis, 2023)Kalibrering er et sentralt tema innenfor autonome systemer som følge av at antakelsen om kalibrerte sensorer alltid er tilstede når sensordata brukes til å utvikle en modell av verden rundt det autonome systemet. Til tross ... -
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 ... -
Decentralized Decision Making in Multi-Agent Systems
Pedersen, Sindre Sønvisen (Master thesis, 2011)The literature in the feld of multi-agent manufacturing control predom-inantly presents qualitative arguments to motivate its usage. This workpresents quantitative meaning to some of these arguments. The work alsodiscusses ... -
Estimation of lactate concentration during excercise
Berntsen, Thomas (Master thesis, 2021)Denne avhandlingen utforsker utviklingen of implementering av modeller og estimering av kontinuerlig laktat konsentrasjon hos utøvere under trening. Målet med en slik estimator er å bestemme laktakkonsentrasjonen hos en ... -
Mathematical modelling of anaerobic exercise and its effect on blood glucose level in people with diabetes type 1
Holt, Markus (Master thesis, 2022)Diabetes mellitus Type 1 (T1D) er en sykdom som forårsaker autoimmun ødeleggelse av betacellene i bukspyttkjertelen, noe som gjør at pasienten ikke selv kan produsere insulin, og dermed regulere blodsukkernivået. Eksogen ... -
Model Based Optimisation of Pacing Strategy in Time Trial Cycling
Digre, Sigurd (Master thesis, 2023)Målet med prosjektet var å finne en optimal effektplan for gjennomføringen av en individuell tidsprøve. Effektplan, i denne sammenheng, er en detaljert instruks for effekt målt på en sykkel. Forfatteren modellerer de ... -
Nonlinear and Adaptive Dynamic Control Allocation
Tjønnås, Johannes (Doctoral thesis, 2008)This work addresses the control allocation problem for a nonlinear over-actuated time-varying system where parameters a¢ ne in the actuator dynamics and actuator force model may be assumed unknown. Instead of optimizing ... -
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 time ... -
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 ... -
Sex-based differences in speed, sub-technique selection, and kinematic patterns during low- and high-intensity training for classical cross-country skiing
Solli, Guro Strøm; Kocbach, Jan; Seeberg, Trine Margrethe; Tjønnås, Johannes; Rindal, Ole Marius Hoel; Haugnes, Pål; Torvik, Per Øyvind; Sandbakk, Øyvind (Journal article; Peer reviewed, 2018)Objectives We investigated sex-based differences in speed, sub-technique selection, and kinematic patterns during low- (LIT) and high-intensity training (HIT) for classical cross-country (XC) skiing across varying terrain. ...