Blar i NTNU Open på forfatter "Ettema, Gertjan"
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On the importance of “front-side mechanics” in athletics sprinting
Haugen, Thomas; Danielsen, Jørgen; Alnes, Leif Olav; McGhie, David; Sandbakk, Øyvind; Ettema, Gertjan (Journal article; Peer reviewed, 2017)Practitioners have for many years argued that athletic sprinters should optimise front-side mechanics (leg motions occurring in front of the extended line through the torso) and minimise back-side mechanics. This study ... -
Oxygen consumption in cycling: The difference between the whole body and the local muscles
Skovereng, Knut (Master thesis, 2011)Introduction: Oxygen consumption during exercise has been extensively studied with the focus primarily on whole body oxygen consumption (tVO2). The purpose of this thesis was to use Near-infrared spectroscopy (NIRS) to ... -
Oxygen Consumption in Cycling: The Relationship between Whole Body Pulmonary O2 Consumption and Muscle Oxygenation in Different Muscles During Constant-Load Cycling
Rasdal, Vegard (Master thesis, 2013)Introduction: Oxygen consumption during prolonged cycling exercise has been extensively studied at different work rates and durations, but with the focus primarily on pulmonary oxygen consumption (pVO2). The purpose of ... -
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) ... -
Performance-related elements for propulsion in ice hockey
Asp, Martine Kvam; Holm, Mia Røkke; Nyhus, Martine Lund (Bachelor thesis, 2022)Bakgrunn: Ishockey er en power idrett kjennetegnet av hyppige og raske bevegelser, noe som gjør mekanikken bak idretten vanskelig å forstå. Denne litteraturstudien hadde derfor som formål å analysere hvordan fysiske og ... -
Physiological Response to Cycling With Variable Versus Constant Power Output
Kolsung, Erik Borg; Ettema, Gertjan; Skovereng, Knut (Peer reviewed; Journal article, 2020)Introduction: Variable power output (VP) is one of the main characteristics of a road cycling mass-start. Tolerating VP during outdoor road cycling highly influences performance. There is a lack of continuous and comprehensive ... -
Player load in male elite soccer: Comparisons of patterns between matches and positions
Dalen, Terje; Aune, Tore Kristian; Hjelde, Geir Håvard; Ettema, Gertjan; Sandbakk, Øyvind; McGhie, David (Peer reviewed; Journal article, 2020)Our primary aim was to explore the development of player load throughout match time (i.e., the pattern) using moving 5-min windows in an elite soccer team and our secondary aim was to compare player load patterns between ... -
Potential effects of physical activity in treatment of depression and anxiety
Thorsen, Lasse (Bachelor thesis, 2021)Bakgrunn: Depresjon er ansett for å være den mest vanlige mentale sykdommen på verdensbasis, hvor WHO rapporterer at over 264 millioner personer lider av en form for depresjon. Formålet med denne rapporten er å se på mulig ... -
Predictors of Running-Related Injuries Among 7,717 Adult Runners Using Garmin Aatches: A Cohort Study
Jensen-Smidt, Signe Salanson (Bachelor thesis, 2022)Resumé Formål: At undersøge potentielle prædiktorer for løbsrelaterede skader. Design: Et kohortestudie med en 18-måneders follow-up periode. Metode: I studiet blev der brugt data fra 7.717 løbere. Information om ... -
A Reappraisal of Ventilatory Thresholds in Wheelchair Athletes With a Spinal Cord Injury: Do They Really Exist?
Baumgart, Julia Kathrin; Ettema, Gertjan; Griggs, Katy E.; Goosey-Tolfrey, Victoria Louise; Leicht, Christof Andreas (Journal article; Peer reviewed, 2021)The ventilatory threshold (VT) separates low- from moderate-intensity exercise, the respiratory compensation point (RCP) moderate- from high-intensity exercise. Both concepts assume breakpoints in respiratory data. However, ... -
The role of external power demand on the choice of technique in classic cross-country skiing
Ettema, Gertjan; Skovereng, Knut; Ritman, Tobias Elvevold; Danielsen, Jørgen (Peer reviewed; Journal article, 2023)In cross-country skiing, athletes use different techniques akin to locomotor gaits such as walking and running. Transitions between these techniques generally depend on speed and incline, in a similar way as walk-run ... -
The role of stroke rate and intensity on rowing technique
Ettema, Gertjan; Haug, Aurora Aasrud; Ludvigsen, Tonje Pedersen; Danielsen, Jørgen (Journal article; Peer reviewed, 2022)We investigated the notion that ergometer rowing technique at different intensities, but self-chosen stroke rates (SR) would resemble each other more than when rowing at other intensity-SR combinations. Twelve competitive ... -
Sprint running: from fundamental mechanics to practice -a review
Haugen, Thomas André; McGhie, David; Ettema, Gertjan (Journal article; Peer reviewed, 2019)In this review, we examine the literature in light of the mechanical principles that govern linear accelerated running. While the scientific literature concerning sprint mechanics is comprehensive, these principles of ... -
Sprinting for the win in cross-country skiing: Pacing strategy, race tactics, and the finish sprint
Haugnes, Pål (Doctoral theses at NTNU;2023:235, Doctoral thesis, 2023)Sprint cross-country (XC) skiing involves whole-body exercise on varying terrain using different sub-techniques of the classical and skating styles. The competition involves one to four ~3 min races, where the qualifying ... -
Strength determinants of jump height in the jump throw movement in women handball players
McGhie, David; Østerås, Sindre; Ettema, Gertjan; Paulsen, Gøran; Sandbakk, Øyvind (Journal article; Peer reviewed, 2018)McGhie, D, Østerås, S, Ettema, G, Paulsen, G, and Sandbakk, Ø. Strength determinants of jump height in the jump throw movement in women handball players. J Strength Cond Res XX(X): 000–000, 2018—The purpose of the study ... -
The study of movement skills in sports: toward an integrative approach
Loland, Sigmund; Ettema, Gertjan; Sandbakk, Øyvind Bucher (Peer reviewed; Journal article, 2023)The article commences with a fundamental objective: to comprehend movement skills in sports in a manner that can bridge the dualist gap between experiential qualities observed in practice and theoretical and mechanistic ... -
The Contribution From Cross-Country Skiing and Shooting Variables on Performance Level and Sex Differences in Biathlon World Cup Individual Races
Luchsinger, Harri; Kocbach, Jan; Ettema, Gertjan; Sandbakk, Øyvind (Journal article; Peer reviewed, 2018)Biathlon is an Olympic winter sport that combines rifle shooting and cross-country skiing in various race formats. In the individual distance (15 km for women and 20 km for men), athletes compete over 5 laps of skiing with ... -
The demands of competitive cross-country ski racing and the effects of equipment design on performance-related factors
Bolger, Conor Michael (Doctoral theses at NTNU;2018:299, Doctoral thesis, 2018)Sammendrag Forståelsen av forholdet mellom idrettens arbeidskrav på den ene siden og utøverens kapasitet og utstyr på den andre er helt sentralt for å oppnå optimale idrettsprestasjoner. I langrenn har utvikling av utstyr ... -
The Effect of 30-Second Sprints During Prolonged Exercise on Gross Efficiency, Electromyography, and Pedaling Technique in Elite Cyclists
Almquist, Nicki Winfield; Ettema, Gertjan; Hopker, James; Sandbakk, Øyvind; Rønnestad, Bent (Journal article; Peer reviewed, 2019)Background: Cycling competitions are often of long duration and include repeated high-intensity efforts. Purpose: To investigate the effect of repeated maximal sprints during 4 hours of low-intensity cycling on gross ... -
The effect of barbell-type on physical load in deadlift
Grostad, Håvard (Master thesis, 2013)Purpose: The purpose of this study was to investigate the influence of barbell type on lifting technique and muscle and joint load during submaximal weights in deadlift. Method: Barbells from olympic weightlifting (OWL) ...