• The aerobic and anaerobic contribution during repeated 30-s sprints in elite cyclists 

      Almquist, Nicki Winfield; Sandbakk, Øyvind; Rønnestad, Bent R.; Noordhof, Dionne (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-26)
      Although the ability to sprint repeatedly is crucial in road cycling races, the changes in aerobic and anaerobic power when sprinting during prolonged cycling has not been investigated in competitive elite cyclists. Here, we used the gross efficiency (GE)-method to investigate: (1) the absolute and relative aerobic and anaerobic contributions during 3 × 30-s sprints included each hour during a 3-h ...
    • Choice of Pole and Ski Lengths Among Elite Cross-Country Skiers: The Influence of Sex and Performance Level 

      Torvik, Per Øyvind; van den Tillaar, Roland Johannes Wilhelmus; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-22)
      Cross-country (XC) skiers employ whole-body exercise to generate speed through poles and skis. The choice of optimal pole and ski lengths are therefore of high importance. The aim of this study was to document pole and ski lengths among elite male and female cross-country skiers in the classical and skating styles and to investigate sex differences in body-height-normalized pole and ski lengths. Our ...
    • Comparison of High and Low Responders to a Cross-Country Skiing Talent Transfer Program: A Coach’s Perspective 

      Sæther, Stig Arve; Mats, Iversen; Kjøsen Talsnes, Rune; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-02)
      Purpose: To examine how coaches differentiate athletes with successful and non-successful development during a cross-country (XC) skiing talent transfer (TT) program. Methods: We conducted qualitative, semi-structured interviews with seven Norwegian coaches working with a group of 23 Chinese summer endurance athletes transferring from running, rowing, and kayaking to the winter endurance sport XC ...
    • Comparison of high-versus low-responders following a 6-month XC ski-specific training period: a multidisciplinary approach 

      Talsnes, Rune Kjøsen; van den Tillaar, Roland; Cai, Xudan; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-08)
      Individual training responses among endurance athletes are determined by a complex interplay between training load, recovery and genetic influence. The present study used a multidisciplinary approach to compare high- and low-responders following a 6-month training period in endurance athletes transferring to cross-country (XC) skiing. Twenty-three endurance-trained athletes (14 runners and 9 ...
    • Comparison of physiological and biomechanical responses to flat and uphill cross-country sit-skiing in able-bodied athletes 

      Carlsen, Camilla Høivik; McGhie, David; Baumgart, Julia Kathrin; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-08)
      <b>Purpose:</b> To compare peak work rate (WR<sub>peak</sub>) and associated physiological and biomechanical performance-determining variables between flat and uphill cross-country (XC) sit-skiing. <b>Methods:</b> Fifteen able-bodied male XC skiers completed 2 test sessions, each comprising four 4-minute submaximal stages, followed by an incremental test to exhaustion and a verification test in ...
    • Contribution from cross-country skiing, start time and shooting components to the overall and isolated biathlon pursuit race performance 

      Luchsinger, Harri Simon; Kocbach, Jan; Ettema, Gerardus Johannes C; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-14)
      <i>Purpose</i> - Biathlon is an Olympic sport combining 3–5 laps of cross-country skiing with rifle shooting, alternating between the prone and standing shooting positions between laps. The individual distance and the sprint are extensively examined whereas the pursuit, with start times based on the sprint results, is unexplored. Therefore, the current study aimed to investigate the contribution ...
    • Development of a Framework for the Investigation of Speed, Power and Kinematic Patterns in Para Cross-Country Sit-Skiing: A Case Study of an LW12 Athlete 

      Baumgart, Julia Kathrin; Haugnes, Pål; Bardal, Lars Morten; Østerås, Sindre; Kocbach, Jan; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-31)
      <i>Objective</i>: To develop a framework for the investigation of speed, power, and kinematic patterns across varying terrain in cross-country (XC) sit-skiing, and to test this framework in a XC sit-skier of the LW12 class during high- (HIT) and low-intensity (LIT) endurance training.<p> <p><i>Methods</i>: One XC sit-skiing athlete of the LW12 class with a single above-the-knee amputation was ...
    • Development of Performance, Physiological and Technical Capacities During a Six-Month Cross-Country Skiing Talent Transfer Program in Endurance Athletes 

      Talsnes, Rune Kjøsen; Hetland, Tor-Arne; Cai, Xudan; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-12)
      <i>Purpose</i>: To examine the development of performance, physiological and technical capacities as well as the effect of sport background among runners, kayakers and rowers when transferred to cross-country (XC) skiing over a 6-month training period.<p><p> <i>Methods</i>: Twenty-four endurance athletes (15 runners and 9 rowers/kayakers; 15 men and 9 women) were tested for performance, physiological ...
    • Development of Performance, Physiological and Technical Capacities During a Six-Month Cross-Country Skiing Talent Transfer Program in Endurance Athletes 

      Talsnes, Rune Kjøsen; Hetland, Tor-Arne; Cai, Xudan; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-12)
      <i>Purpose</i>: To examine the development of performance, physiological and technical capacities as well as the effect of sport background among runners, kayakers and rowers when transferred to cross-country (XC) skiing over a 6-month training period.<p> <i>Methods</i>: Twenty-four endurance athletes (15 runners and 9 rowers/kayakers; 15 men and 9 women) were tested for performance, physiological ...
    • 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; Tidsskriftartikkel; Peer reviewed, 2021-07-08)
      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 relationship between the recovery of the anaerobic energy reserves and performance; and 3) to compare the gross efficiency (GE) method and maximal accumulated oxygen deficit (MAOD) to ...
    • Effect of carbohydrate content in a pre-event meal on endurance performance and performance-determining factors: a randomize-controlled trial. 

      Aandahl, Mats; Noordhof, Dionne; Tjønna, Arnt Erik; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-26)
      Although the ability to sprint repeatedly is crucial in road cycling races, the changes in aerobic and anaerobic power when sprinting during prolonged cycling has not been investigated in competitive elite cyclists. Here, we used the gross efficiency (GE)-method to investigate: (1) the absolute and relative aerobic and anaerobic contributions during 3 × 30-s sprints included each hour during a 3-h ...
    • Effects of Including Sprints in One Weekly Low-Intensity Training Session During the Transition Period of Elite Cyclists 

      Almquist, Nicki Winfield; Løvlien, Ine; Byrkjedal, Per Thomas; Spencer, Matthew; Kristoffersen, Morten; Skovereng, Knut; Sandbakk, Øyvind; Rønnestad, Bent (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-11)
      The purpose of this study was to investigate the effects of including 30-s sprints in one weekly low-intensity training (LIT) session during a 3-week transition period in elite cyclists. Sixteen male elite cyclists (maximal oxygen uptake, VO<sub>2max</sub>: 72 ± 5 ml·kg<sup>−1</sup>·min<sup>−1</sup>) reduced their training load by ~60% for 3 weeks from the end of competitive season and performed ...
    • Effects of upper-body sprint-interval training on strength and endurance capacities in female cross-country skiers 

      Vandbakk, Kristine; Welde, Boye; Hovstein, Andrea; Baumgart, Julia Kathrin; Ettema, Gertjan; Karlsen, Trine; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-27)
      Thermal conductivity and thermal diffusivity of ionic liquids (ILs) are investigated in this work. A hot disk method for ILs thermal conductivity and thermal diffusivity measurement is utilized. Firstly, the thermal conductivity of water is measured to check the reliability of the hot disk method. In addition, the thermal conductivity of pure ILs, including BmimBF<sub>4</sub>, BmimPF<sub>6</sub>, ...
    • Indian Endurance Athletes' Menstrual Cycle: Practices, Knowledge, Communication, Health, and Changes in Perceptions Across the Phases 

      Majumder, Tanugatri; de Martin Topranin, Virginia; Sandbakk, Øyvind; Noordhof, Dionne (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-08)
      Purpose: To describe menstrual cycle (MC)-related practices, knowledge, communication, and health in Indian endurance athletes and to investigate the changes in their perception of sleep quality, readiness to train, training quality, fitness, and performance across the MC. Methods: Data on female Indian athletes (N = 96, age 22 [3] y) competing in 7 endurance sports at (inter)national and state level ...
    • The influence of race tactics for performance in the heats of an international sprint cross-country skiing competition 

      Haugnes, Pål; Kocbach, Jan; Kjøsen Talsnes, Rune; Noordhof, Dionne; Ettema, Gertjan; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-09)
      The purpose of this study was to examine the influence of race tactics for performance in the heats of an international sprint cross-country (XC) skiing competition in the classical style. Thirty elite male XC skiers (age: 24±3 years, sprint International Ski Federation [FIS] points: 61±27) performed a sprint time-trial (STT) followed by one to three ‘knock-out’ heats on a 1.7 km racecourse. An ...
    • Offered Support and Knowledge about the Menstrual Cycle in the Athletic Community: A Cross-Sectional Study of 1086 Female Athletes 

      von Rosen, Philip; Ekenros, Linda; Solli, Guro Strøm; Sandbakk, Øyvind; Holmberg, Hans-Christer; Hirschberg, Angelica Lindén; Fridén, Cecilia (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-21)
      Many female athletes perceive that symptoms related to the menstrual cycle such as dysmenorrhea, premenstrual symptoms, amenorrhea or side-effects of hormonal contraceptives negatively impact their training, performance, and general well-being. Knowledge and communication about female athletes’ health is therefore important in the sport community. The aims of this study were to explore the level ...
    • Perceived impact of the menstrual cycle and hormonal contraceptives on physical exercise and performance in 1,086 athletes from 57 sports 

      Ekenros, Linda; von Rosen, Philip; Solli, Guro Strøm; Sandbakk, Øyvind; Holmberg, Hans-Christer; Hirschberg, Angelica Lindén; Fridén, Cecilia (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-30)
      Female athletes train and compete under the potential influence of hormonal fluctuations during the menstrual cycle or during use of various hormonal contraceptives. Dysmenorrhea and premenstrual symptoms are common in the general population, as well as side effects of hormonal contraceptives. More detailed knowledge concerning prevalence and perceived impact of these symptoms on training and ...
    • Pole Length Influences Performance During On-Snow Skating in Female Cross-Country Skiers. 

      van den Tillar, R.; Bostad, Guro; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-27)
      Purpose The purpose of this study was to examine the efect of pole length on performance and technique selection during a simulated skating cross-country (XC) skiing competition on snow in female XC skiers.<p> <p>Methods Nine female XC skiers and biathletes (VO<sub>2max</sub> 63.6±6.2 mL/min/kg, age 22.9±3.5 years, body height 1.69±0.1 m and body mass 60.8±4.6 kg) completed two 5-km skating ...
    • Prevalence and Self-Perceived Experiences With the Use of Hormonal Contraceptives Among Competitive Female Cross-Country Skiers and Biathletes in Norway: The FENDURA Project 

      Engseth, Tina Pettersen; Andersson, Erik P; Solli, Guro Strøm; Morseth, Bente; Thomassen, Tor Oskar; Noordhof, Dionne; Sandbakk, Øyvind; Welde, Boye (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-14)
      Purpose: To investigate the prevalence of hormonal contraceptive (HC) use by female cross-country (XC) skiers and biathletes competing at a national and/or international level, their reasons for HC use, and to compare negative symptoms related to the HC-/menstrual cycle in HC users and non-HC users. Additionally, to characterize the self-perceived influence of HC use on training and performance.<p ...
    • The Role of Emotions for 4 Athletes in Nordic Combined in Ski Jumping Competitions in World Cup 

      Moen, Frode; Vitsøe, Joar; Rasdal, Vegard; Myhre, Kenneth; Sandbakk, Øyvind (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-03-02)
      This study looks at how emotions were associated with ski jumping competitions in world cup for four athletes representing the Norwegian national team in Nordic combined. The athletes documented their emotional experiences during competition rounds (trial-, and competition rounds) and non-competitive episodes (the period just after the competition round). The results in this study show that there ...