Browsing Brage NIH by Author "Kristoffersen, Morten"

Now showing items 1-8 of 8

    • Accuracy of tracking devices’ ability to assess exercise energy expenditure in professional female soccer players: Implications for quantifying energy availability 

      Friborg, Oddgeir; Kristoffersen, Morten; Pettersen, Gunn; Sundgot-Borgen, Jorunn; Dasa, Marcus Småvik Tutu; Rosenvinge, Jan H. (Peer reviewed; Journal article, 2022)
      The purpose of the study was to assess the accuracy of commonly used GPS/accelerometer-based tracking devices in the estimation of exercise energy expenditure (EEE) during high-intensity intermittent exercise. A total of ...

    • Associations between biological maturity level, match locomotion, and physical capacities in youth male soccer players 

      Gundersen, Hilde; Riiser, Amund; Algrøy, Erling Andre; Vestbøstad, Mona; Sæterbakken, Atle Hole; Clemm, Hege Synnøve Havstad; Grendstad, Halvard; Hafstad, Arild; Kristoffersen, Morten; Rygh, Cecilie Brekke (Peer reviewed; Journal article, 2022)
      Introduction: Biological maturity level has shown to affect sport performance in youths. However, most previous studies have used noninvasive methods to estimate maturity level. Thus, the main aim of the present study was ...

    • The effects of being told you are in the intervention group on training results: A pilot study 

      Lindberg, Kolbjørn Andreas; Bjørnsen, Thomas; Vårvik, Fredrik Tonstad; Paulsen, Gøran; Joensen, Malene; Kristoffersen, Morten; Sveen, Ole; Gundersen, Hilde; Slettaløkken, Gunnar; Brankovic, Robert; Solberg, Paul André (Peer reviewed; Journal article, 2023)
      Little is known about the placebo effects when comparing training interventions. Consequently, we investigated whether subjects being told they are in the intervention group get better training results compared to subjects ...

    • Energy expenditure, dietary intake and energy availability in female professional football players 

      Friborg, Oddgeir; Kristoffersen, Morten; Pettersen, Gunn; Plasqui, Guy; Dasa, Marcus Småvik Tutu; Sundgot-Borgen, Jorunn Kaiander; Rosenvinge, Jan H. (Peer reviewed; Journal article, 2023)
      Objectives: To quantify energy expenditure and intake in professional female footballers playing on a national and/or international level. Second, to determine the prevalence of low energy availability among these players, ...

    • Evaluating the suitability of the Low Energy Availability in Females Questionnaire (LEAF-Q) for female football players 

      Dasa, Marcus Småvik Tutu; Friborg, Oddgeir; Kristoffersen, Morten; Pettersen, Gunn; Sagen, Jørn Vegard; Sundgot-Borgen, Jorunn; Rosenvinge, Jan Harald (Peer reviewed; Journal article, 2023)
      Background: The Low Energy Availability in Females Questionnaire (LEAF-Q) is a screening tool developed to detect endurance athletes and dancers at risk for development of persistent low energy availability (LEA) and the ...

    • Force-velocity profiling in athletes: Reliability and agreement across methods 

      Lindberg, Kolbjørn Andreas; Bjørnsen, Thomas; Helland, Christian; Rønnestad, Bent; Haugen, Thomas André; Østerås, Sindre; Kristoffersen, Morten; Paulsen, Gøran; Solberg, Paul André; Frank, Martin Thorsen; Midttun, Magnus; Sæland, Fredrik (Peer reviewed; Journal article, 2021)
      The aim of the study was to examine the test-retest reliability and agreement across methods for assessing individual force-velocity (FV) profiles of the lower limbs in athletes. Using a multicenter approach, 27 male ...

    • Performance in youth track and field is associated with birth quartile: A register-based study among athletes in Norway from 10 years to senior level 

      Gundersen, Hilde; Harris, Anette Kristoffersen; Grendstad, Halvard; Kristoffersen, Morten; Guttormsen, Atle; Dalen, Terje; Rygh, Cecilie Brekke (Peer reviewed; Journal article, 2022)
      Introduction: Earlier studies have demonstrated that the oldest in a competition class are more likely to succeed than the youngest, a phenomenon called relative age effect (RAE). Track and field give us an opportunity to ...

    • Strength and Power Testing of Athletes: A Multicenter Study of Test-Retest Reliability 

      Lindberg, Kolbjørn Andreas; Solberg, Paul André; Bjørnsen, Thomas; Helland, Christian; Rønnestad, Bent; Frank, Martin; Haugen, Tommy; Østerås, Sindre; Kristoffersen, Morten; Midttun, Magnus; Sæland, Fredrik; Eythorsdottir, Ingrid Eir Thorp; Paulsen, Gøran (Peer reviewed; Journal article, 2022)
      Purpose:This study examined the test–retest reliability of common assessments for measuring strength and power of the lowerbody in high-performing athletes.Methods:A total of 100 participants, including both male (n=83) ...