• Achieving energy balance with a high‐fat meal does not enhance skeletal muscle adaptation and impairs glycaemic response in a sleep‐low training model 

      Areta, José; Iraki, Juma; Owens, Daniel J.; Joanisse, Sophie; Philp, Andrew; Morton, James P.; Hallén, Jostein (Peer reviewed; Journal article, 2020)
      Training with low carbohydrate availability (LCHO) has been shown to acutely enhance endurance training skeletal muscle response, but the concomitant energy deficit (ED) in LCHO interventions has represented a confounding ...
    • Blood volume expansion does not explain the increase in peak oxygen uptake induced by 10 weeks of endurance training 

      Skattebo, Øyvind; Bjerring, Anders W.; Auensen, Marius; Sarvari, Sebastian; Cumming, Kristoffer Toldnes; Capelli, Carlo; Hallén, Jostein (Peer reviewed; Journal article, 2020)
      Purpose: The endurance training (ET)-induced increases in peak oxygen uptake (V˙O2peak) and cardiac output (Q˙peak) during upright cycling are reversed to pre-ET levels after removing the training-induced increase in blood ...
    • Changes in calpain activity, muscle structure, and function after eccentric exercise 

      Raastad, Truls; Owe, Simen Gylterud; Paulsen, Gøran; Enns, Deborah; Overgaard, Kristian; Crameri, Regina; Kiil, Steinar; Belcastro, Angelo; Bergersen, Linda Hildegard; Hallén, Jostein (Journal article; Peer reviewed, 2010-01)
      Purpose: The aim of this study was to investigate changes in muscle function, muscle structure, and calpain activity after high-force eccentric exercise. Methods: Eleven healthy males performed 300 maximal voluntary eccentric ...
    • Contribution of oxygen extraction fraction to maximal oxygen uptake in healthy young men 

      Skattebo, Øyvind; Calbet, Jose Antonio Lopez; Rud, Bjarne; Capelli, Carlo; Hallén, Jostein (Peer reviewed; Journal article, 2020)
      We analysed the importance of systemic and peripheral arteriovenous O2 difference (a-vO2 difference and a-vfO2 difference, respectively) and O2 extraction fraction for maximal oxygen uptake (VO2max). Fick law of diffusion ...
    • Effects of active versus passive recovery in sprint cross-country skiing. 

      Losnegard, Thomas; Andersen, Martin; Spencer, Matthew; Hallén, Jostein (Journal article; Peer reviewed, 2015-07-05)
      Purpose: To investigate the effects of an active and a passive recovery protocol on physiological responses and performance between 2 heats in sprint cross-country skiing. Methods: Ten elite male skiers (22 ± 3 y, 184 ± 4 ...
    • Evidence against a beneficial effect of irisin in humans 

      Raschke, Silja; Elsen, Manuela; Gassenhuber, Hans; Sommerfeld, Mark; Schwahn, Uwe; Brockmann, Barbara; Jung, Raphael; Wisløff, Ulf; Tjønna, Arnt E.; Raastad, Truls; Hallén, Jostein; Norheim, Frode; Drevon, Christian A.; Romacho, Tania; Eckardt, Kristin; Eckel, Juergen (Journal article; Peer reviewed, 2013-09-11)
      Brown adipose tissue has gained interest as a potential target to treat obesity and metabolic diseases. Irisin is a newly identified hormone secreted from skeletal muscle enhancing browning of white fat cells, which improves ...
    • Exercise economy in skiing and running 

      Losnegard, Thomas; Schäfer, Daniela; Hallén, Jostein (Journal article; Peer reviewed, 2014-01-24)
      Substantial inter-individual variations in exercise economy exist even in highly trained endurance athletes. The variation is believed to be determined partly by intrinsic factors. Therefore, in the present study, we ...
    • From talented child to elite athlete: The development of cardiac morphology and function in a cohort of endurance athletes from age 12 to 18 

      Bjerring, Anders W.; Landgraff, Hege Wilson; Leirstein, Svein; Haugaa, Kristina; Edvardsen, Thor; Sarvari, Sebastian; Hallén, Jostein (Peer reviewed; Journal article, 2020)
      Background: Adult athletes undergo cardiac adaptions in what is known as the “athlete’s heart”. Cardiac adaptations in young athletes have not been described in longitudinal studies but have previously been believed to be ...
    • Is the balance between skeletal muscular metabolic capacity and oxygen supply capacity the same in endurance trained and untrained subjects? 

      Rud, Bjarne; Hallén, Jostein (Peer reviewed; Journal article, 2008-12-02)
      We attempted to test whether the balance between muscular metabolic capacity and oxygen supply capacity in endurance-trained athletes (ET) differs from that in a control group of normal physically active subjects by using ...
    • Kinematical analysis of the V2 ski skating technique: A longitudinal study 

      Losnegard, Thomas; Myklebust, Håvard; Ehrhardt, Angela; Hallén, Jostein (Journal article; Peer reviewed, 2017)
      To characterise timing of movements and evaluate performance effects of technique alterations in V2 ski skating, 13 elite male cross-country skiers (age, 23 ± 2 years; stature, 182 ± 6 cm; body mass, 76 ± 8 kg; V2 V̇O2max, ...
    • Muscular exercise capacity and body fat predict VO2peak in heart transplant recipients 

      Nytrøen, Kari; Rustad, Lene Annette; Gude, Einar; Hallén, Jostein; Fiane, Arnt E.; Rolid, Katrine; Holm, Inger; Aakhus, Svend; Gullestad, Lars (Journal article; Peer reviewed, 2012-06-01)
      Heart transplant (HTx) recipients usually have reduced exercise capacity, with reported VO2peak levels of 50–70% of predicted values. This study aimed to evaluate central and peripheral factors predictive of VO2peak. ...
    • Peripheral adaptations to endurance training - Effect of active muscle mass 

      Mølmen, Knut Sindre; Hallén, Jostein; Rud, Bjarne (Peer reviewed; Journal article, 2019)
      The purpose of this study was to evaluate whether adaptations to endurance training are affected by active muscle mass during training. Eleven healthy subjects performed 5 weeks of one‐legged knee extension (1‐KE) training ...
    • Physiological differences between sprint- and distance-specialized cross-country skiers 

      Losnegard, Thomas; Hallén, Jostein (Journal article; Peer reviewed, 2014)
      Purpose: Sprint- (≤1.8 km) and distance-skiing (≥15 km) performance rely heavily on aerobic capacity. However, in sprint skiing, due to the ~20% higher speed, anaerobic capacity contributes significantly. This study aimed ...
    • Technique analysis in elite athletes using principal component analysis 

      Gløersen, Øyvind Nøstdahl; Myklebust, Håvard; Hallén, Jostein; Federolf, Peter Andreas (Journal article; Peer reviewed, 2018)
      The aim of this study was to advance current movement analysis methodology to enable a technique analysis in sports facilitating (1) concurrent comparison of the techniques between several athletes; (2) identification of ...
    • The influence of pole length on performance, O2-cost and kinematics in double poling 

      Losnegard, Thomas; Myklebust, Håvard; Skattebo, Øyvind; Stadheim, Hans Kristian; Sandbakk, Øyvind; Hallén, Jostein (Journal article; Peer reviewed, 2016-04-27)
      Purpose: In the double poling cross-country skiing technique, the propulsive forces are transferred solely through the poles. The aim of the present study was to investigate how pole length influences double poling ...
    • Training effects on skeletal muscle calcium handling in human chronic heart failure 

      Munkvik, Morten; Rehn, Tommy A.; Slettaløkken, Gunnar; Hasic, Almira; Hallén, Jostein; Sjaastad, Ivar; Sejersted, Ole M.; Lunde, Per Kristian (Journal article; Peer reviewed, 2010-05)
      Purpose: Patients with chronic heart failure (CHF) typically complain about skeletal muscle fatigue. In rat experiments, reduced intracellular calcium release seems to be related to fatigue development in normal skeletal ...
    • Upper body heavy strength training does not affect performance in junior female cross-country skiers 

      Skattebo, Øyvind; Hallén, Jostein; Rønnestad, Bent; Losnegard, Thomas (Journal article; Peer reviewed, 2015-07-06)
      We investigated the effects of adding heavy strength training to a high volume of endurance training on performance and related physiological determinants in junior female cross-country skiers. Sixteen well-trained athletes ...
    • Validation of ActiReg (R) to measure physical activity and energy expenditure against doubly labelled water in obese persons 

      Hustvedt, Bo-Egil; Svendsen, Mette; Løvø, Arne; Ellegård, Lars; Hallén, Jostein; Tonstad, Serena (Peer reviewed; Journal article, 2008-01-15)
      ActiReg® is an instrument that uses combined recordings of body position and motion to calculate energy expenditure (EE) and physical activity (PA). The aim of the study was to compare mean total energy expenditure (TEE) ...
    • Variability and predictability of performance times of elite cross-country skiers 

      Spencer, Matt; Losnegard, Thomas; Hallén, Jostein; Hopkins, Will G. (Journal article; Peer reviewed, 2014-01)
      Analyses of elite competitive performance provide useful information for research and practical applications. Purpose: Here the authors analyze performance times of cross-country skiers at international competitions (World ...