Blar i Brage NIH på forfatter "Gilgien, Matthias"
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Oxygen demand, uptake, and deficits in elite cross-country skiers during a 15-km race
Gløersen, Øyvind Nøstdahl; Gilgien, Matthias; Dysthe, Dag Kristian; Malthe-Sørenssen, Anders; Losnegard, Thomas Johansen (Peer reviewed; Journal article, 2020)Purpose: This study aimed to quantify the repeated oxygen deficits attained during intermittent endurance exercise by measuring oxygen consumption (V˙O2) and oxygen demand (V˙O2dem) throughout a simulated roller ski ... -
Performance analysis in ski jumping with a differential global navigation satellite system and video-based pose estimation
Elfmark, Ola; Ettema, Gertjan; Groos, Daniel; Ihlen, Espen Alexander F.; Velta, Rune; Haugen, Per; Bråten, Steinar; Gilgien, Matthias (Peer reviewed; Journal article, 2021)This study investigated the explanatory power of a sensor fusion of two complementary methods to explain performance and its underlying mechanisms in ski jumping. A differential Global Navigation Satellite System (dGNSS) ... -
Pole Length’s Influence on Performance During Classic-Style Snow Skiing in Well-Trained Cross-Country Skiers
Trøen, Erik; Rud, Bjarne; Karlsson, Øyvind; Carlsen, Camilla Høivik; Gilgien, Matthias; Paulsen, Gøran; Tosterud, Ola Kristoffer; Losnegard, Thomas Johansen (Peer reviewed; Journal article, 2020)Purpose: To investigate how self-selected pole length (PL) of ∼84% (PL84%) compared with ∼90% (PL90%) of body height influenced performance during a 700-m time trial with undulating terrain on snow. Methods: Twenty-one ... -
Propulsive Power in Cross-Country Skiing: Application and Limitations of a Novel Wearable Sensor-Based Method During Roller Skiing
Gløersen, Øyvind Nøstdahl; Losnegard, Thomas; Malthe-Sørenssen, Anders; Dysthe, Dag Kristian; Gilgien, Matthias (Journal article; Peer reviewed, 2018)Cross-country skiing is an endurance sport that requires extremely high maximal aerobic power. Due to downhill sections where the athletes can recover, skiersmust also have the ability to perform repeated efforts where ... -
Ranking robot-assisted surgery skills using kinematic sensors
Ogul, Burcin Buket; Gilgien, Matthias; Sahin, Pinar Duygulu (Peer reviewed; Journal article, 2019)Assessing surgical skills is an essential part of medical performance evaluation and expert training. Since it is typically conducted as a subjective task by individuals, it may lead to misinterpretations of the skill ... -
Ranking surgical skills using an attention-enhanced Siamese network with piecewise aggregated kinematic data
Oğul, Burçin Buket; Gilgien, Matthias; Özdemir, Suat (Peer reviewed; Journal article, 2022)Purpose: Surgical skill assessment using computerized methods is considered to be a promising direction in objective performance evaluation and expert training. In a typical architecture for computerized skill assessment, ... -
Sidecut radius and kinetic energy: equipment designed to reduce risk of severe traumatic knee injuries in alpine giant slalom ski racing.
Kröll, Josef; Spörri, Jörg; Gilgien, Matthias; Schwameder, Hermann; Müller, Erich (Journal article; Peer reviewed, 2016-02-04)Background: Kinetic energy (Ekin) increases with speed by the power of 2 and is considered a major risk factor for injuries in alpine ski racing. There is no empirical knowledge about the effect of ski geometry on Ekin. ... -
Sidecut radius and the mechanics of turning—equipment designed to reduce risk of severe traumatic knee injuries in alpine giant slalom ski racing.
Spörri, Jörg; Kröll, Josef; Gilgien, Matthias; Müller, Erich (Journal article; Peer reviewed, 2016)Background: There is limited empirical knowledge about the effect of ski geometry, particularly in the context of injury prevention in alpine ski racing. We investigated the effect of sidecut radius on biomechanical variables ... -
The snow-friction of freestyle skis and snowboards predicted from snow physical quantities
Wolfsperger, Fabian; Gilgien, Matthias; Meyer, Frédéric (Peer reviewed; Journal article, 2021)Previous research has shown that friction between ski and snow can vary substantially due to changes in snow conditions. The variation of friction affects the speed a freestyle skier or snowboarder (athlete) reaches during ... -
The effect of different global navigation satellite system methods on positioning accuracy in elite alpine skiing
Gilgien, Matthias; Spörri, Jörgen; Limpach, Philippe; Geiger, Alain; Müller, Erich (Journal article; Peer reviewed, 2014-10-03)In sport science, Global Navigation Satellite Systems (GNSS) are frequently applied to capture athletes’ position, velocity and acceleration. Application of GNSS includes a large range of different GNSS technologies and ... -
The Training of Olympic Alpine Ski Racers
Gilgien, Matthias; Reid, Robert Cortas; Raschner, Christian; Supej, Matej; Holmberg, Hans-Christer (Journal article; Peer reviewed, 2018)Alpine combined was the only alpine ski racing event at the first Winter Olympic Games in 1936, but since then, slalom, giant slalom, super-G, downhill, and team events have also become Olympic events. Substantial improvements ... -
Three-dimensional body and centre of mass kinematics in alpine ski racing using differential GNSS and inertial sensors
Fasel, Benedikt; Spörri, Jörg; Gilgien, Matthias; Boffi, Geo; Chardonnens, Julien; Müller, Erich; Aminian, Kamiar (Journal article; Peer reviewed, 2016-08-22)A key point in human movement analysis is measuring the trajectory of a person’s center of mass (CoM). For outdoor applications, differential Global Navigation Satellite Systems (GNSS) can be used for tracking persons since ... -
Towards more valid simulations of slopestyle and big air jumps: Aerodynamics during in-run and flight phase
Wolfsperger, Fabian; Meyer, Frédéric; Gilgien, Matthias (Peer reviewed; Journal article, 2021)Objectives: This study aimed to investigate air drag and lift during the in-run and flight phase of ski and snowboard slopestyle and big air, to allow more valid modeling of jumps and hence reduce injury risk. Design: ... -
Tracking Performance in Endurance Racing Sports: Evaluation of the Accuracy Offered by Three Commercial GNSS Receivers Aimed at the Sports Market
Gløersen, Øyvind Nøstdahl; Kocbach, Jan; Gilgien, Matthias (Journal article; Peer reviewed, 2018)Advances in global navigation satellite system (GNSS) technology have resulted in smaller and more accurate GNSS receivers, which have become increasingly suitable for calculating instantaneous performance parameters during ... -
Validation methods for global and local positioning-based athlete monitoring systems in team sports: a scoping review
Luteberget, Live; Gilgien, Matthias (Peer reviewed; Journal article, 2020)Background/Objective: Global navigation satellite systems (GNSS) and local positioning systems (LPS) are to date common tools to measure external training load in athletes. The aim of this scoping review was to map out and ... -
Validity of the AdMos, Advanced Sport Instruments, GNSS sensor for use in alpine skiing
Reid, Robert Cortas; Gilgien, Matthias; Jølstad, Petter Andre Husevåg; Gjevestad, Jon Glenn Omholt (Peer reviewed; Journal article, 2022)The AdMos receiver from Advanced Sport Instruments is a global navigation satellite system (GNSS) frequently used in alpine ski racing, with users from national and professional teams. Therefore, a validation was conducted ...