Browsing NTNU Open by Author "Ettema, Gertjan"
Now showing items 1-20 of 83
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A biomechanical and physiological comparison of the double poling and diagonal stride technique in cross-country skiing : under different combinations of inclines and intensities
Dahl, Christine (Master thesis, 2016)Background: High efficiency is an obvious determining factor for skiing performance. Hence, it is likely that efficiency in the double poling (DP) and diagonal stride (DIA) technique may be affected by incline since the ... -
A Reappraisal of Ventilatory Thresholds in Cycling – What is the Evidence?
Masieri, Luca Francesco (Master thesis, 2023)ABSTRACT Background: Intensity zones are commonly used to individualize training programs. These zones are often based on ventilatory thresholds (VTs) retrieved from graded exercise testing (GXT) protocols. The VT1 ... -
Aerodynamics and its Relationship with Kinematics and Performance in Ski Jumping
Elfmark, Ola Anker (Doctoral theses at NTNU;2022:278, Doctoral thesis, 2022) -
Assessment of the steady glide phase in ski jumping
Elfmark, Ola; Ettema, Gertjan; Gilgien, Matthias (Peer reviewed; Journal article, 2022)The purpose of this investigation was to compare how key variables of the steady glide phase relate to performance in the two hill sizes used in World Cup and Olympic competitions, i.e, normal and large hills. In this ... -
Association between Laboratory Capacities and World-cup Performance in Nordic Combined
Rasdal, Vegard; Fudel, Ronny; Kocbach, Jan; Moen, Frode; Ettema, Gertjan; Sandbakk, Øyvind (Journal article; Peer reviewed, 2017)Background Nordic combined (NC) is an Olympic winter-sport performed as a ski jumping (SJ) event followed by a cross-country (XC) pursuit race employing the skating style. Purpose To elucidate the associations ... -
The Battle of the Equations: A Systematic Review of Jump Height Calculations Using Force Platforms
Eythorsdottir, Ingrid Eir Thorp; Gløersen, Øyvind; Rice, Hannah; Werkhausen, Amelie; Ettema, Gertjan; Mentzoni, Fredrik; Solberg, Paul Andre; Lindberg, Kolbjørn Andreas; Paulsen, Gøran (Journal article; Peer reviewed, 2024)Vertical jump height measures our ability to oppose gravity and lower body neuromuscular function in athletes and various clinical populations. Vertical jump tests are principally simple, time-efficient, and extensively ... -
Biomechanical analysis of the herringbone technique in classical cross-country skiing
Andersson, Bror Erik Petrus (Master thesis, 2011)Purpose: To investigate the mechanics of the cross-country herringbone technique and to enhance the understanding of adaptations in kinematics and kinetics due to increasing velocity. Method: Eleven male elite cross-country ... -
Case Report: Adjusting Seat and Backrest Angle Improves Performance in an Elite Paralympic Rower
Severin, Cecilia; Danielsen, Jørgen; Erichsen, Jorgen Falck; Eikevåg, Sindre Wold; Steinert, Martin; Ettema, Gertjan; Baumgart, Julia Kathrin (Peer reviewed; Journal article, 2021)Paralympic rowers with functional impairments of the legs and trunk rely on appropriate seat configurations for performance. We compared performance, physiology, and biomechanics of an elite Paralympic rower competing in ... -
Changes in power output, physiological responses and technique during upper-body repeated sprint exercise
Skålvik, Tommy Fredriksen (Master thesis, 2013)Purpose: The purpose of this study was to examine upper-body repeated sprint performance, physiological responses, and the relationships to technique and muscle co-ordination. Methods: Twelve male elite cross-country ... -
Choice of technique in classical roller-skiing - The influence of speed, incline and work rate, and relationship between power and technique choice
Løkkeborg, Johannes Alnes (Master thesis, 2019)Formål: Klassisk langrenn består hovedsakelig av tre ulike delteknikker, staking (ST), staking med fraspark (STF) og diagonalgang (DIA), og anvendes basert på faktorer som hastighet og terreng. Hovedformålet med denne ... -
Comparison of peak oxygen uptake and exercise efficiency between upper-body poling and arm crank ergometry in trained paraplegic and able-bodied participants
Baumgart, Julia Kathrin; Gurtler, Laura; Ettema, Gertjan; Sandbakk, Øyvind (Journal article; Peer reviewed, 2018)Purpose To compare peak oxygen uptake (VO2peak) and exercise efficiency between upper-body poling (UBP) and arm crank ergometry (ACE) in able-bodied (AB) and paraplegic participants (PARA). Methods Seven PARA and eleven ... -
Comparison of Performance-Levels and Sex on Sprint Race Performance in the Biathlon World Cup
Luchsinger, Harri; Kocbach, Jan; Ettema, Gertjan; Sandbakk, Øyvind (Journal article; Peer reviewed, 2017)Biathlon is an Olympic sport combining cross-country skiing with the skating technique and rifle shooting. The sprint (7.5 km for women and 10 km for men) includes two shootings between the three laps of skiing. The aims ... -
Comparison of test-retest reliability of peak oxygen uptake during different upper-body poling protocols
Ofstad, Lilli Marie Myhre (Master thesis, 2016)Background and purpose: Upper body poling is a sport-specific exercise mode for several Paralympic sports such as Nordic sit ski and ice sledge hockey. However, there is a lack of reliable and standardized tests to evaluate ... -
Concurrent optimization of two extremes: performance, physiological, and training characteristics of world class Nordic combined athletes
Rasdal, Vegard (Doctoral theses at NTNU;2019:136, Doctoral thesis, 2019) -
The contribution from cross-country skiing and shooting variables for biathlon performance in sprint, individual and pursuit competitions
Luchsinger, Harri (Doctoral theses at NTNU;2021:423, Doctoral thesis, 2021)Summary Biathlon is an Olympic winter sport combining cross-country (XC) skiing in the skating technique with rifle marksmanship. Biathletes ski loops of 1.5-4 km with shooting between laps in either the prone or standing ... -
Determination of peak oxygen uptake, the anaerobic threshold and efficiency in Paralympic sitting sports - With emphasis on the influence of test mode and protocol
Baumgart, Julia Kathrin (Doctoral theses at NTNU, 2018:342, Doctoral thesis, 2018)SUMMARY Endurance exercise performance is mainly determined by peak oxygen uptake (VO2peak), percentage of VO2peak used at the anaerobic threshold and efficiency. Furthermore, a high VO2peak increases tolerance for higher ... -
The development process of the most successful Winter Olympian in history
Solli, Guro Strøm (Doctoral theses at NTNU;2020:343, Doctoral thesis, 2020)Å bli olympisk- eller verdensmester i utholdenhetsidrett krever langvarig og dedikert trening for å utvikle de spesifikke fysiske, tekniske og mentale ferdighetene som trengs for å prestere i verdensklasse. I dag er det ... -
Different solutions in generation of angular momentum during imitation jump take-offs among diverse level ski jumpers
Fjeld, Birk Eirik (Master thesis, 2017)Introduction: During the push-off motion in ski jumping, the athlete strives to generate both a high vertical velocity and a correct angular momentum. The latter is important as it brings the athlete into the flight position. ... -
The dynamics of the anaerobic energy contribution during a simulated mass-start competition while roller-ski skating on a treadmill.
Noordhof, Dionne; Danielsson, Marius Lyng; Skovereng, Knut; Danielsen, Jørgen; Seeberg, Trine Margrethe; Haugnes, Pål; Kocbach, Jan; Ettema, Gertjan; Sandbakk, Øyvind (Journal article; Peer reviewed, 2021)The purposes of this study were: 1) to investigate the anaerobic energy contribution during a simulated cross-country (XC) skiing mass-start competition while roller-ski skating on a treadmill; 2) to investigate the ... -
Effect of resistance on performance in double poling
Sagen, Gard Olve (Master thesis, 2014)The purpose of this study was to investigate what effect resistance would have on performance in double poling, with focus on power output, physiological responses and myoelectric activation. 6 elite male cross country ...