Blar i forfatter "Ørtenblad, Niels"

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    • Contractile Properties of MHC I and II Fibers From Highly Trained Arm and Leg Muscles of Cross-Country Skiers 

      Gejl, Kasper Degn; Hvid, Lars G.; Andersson, Erik P.; Jensen, Rasmus; Holmberg, Hans-Christer; Ørtenblad, Niels (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-16)
      <i>Introduction</i>: Little is known about potential differences in contractile properties of muscle fibers of the same type in arms and legs. Accordingly, the present study was designed to compare the force-generating capacity and Ca<sup>2+</sup> sensitivity of fibers from arm and leg muscles of highly trained cross-country skiers.<br><br> <i>Method</i>: Single muscle fibers of <i>m. vastus ...

    • The muscle fiber profiles, mitochondrial content, and enzyme activities of the exceptionally well-trained arm and leg muscles of elite cross-country skiers 

      Ørtenblad, Niels; Nielsen, Joachim; Boushel, Robert; Söderlund, Karin; Saltin, Bengt; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-08-02)
      As one of the most physically demanding sports in the Olympic Games, crosscountry skiing poses considerable challenges with respect to both force generation and endurance during the combined upper- and lower-body effort of varying intensity and duration. The isoforms of myosin in skeletal muscle have long been considered not only to define the contractile properties, but also to determine metabolic ...

    • The physiological mechanisms of performance enhancement with sprint interval training differ between the upper and lower extremities in humans 

      Zinner, Christoph; Morales-Alamo, David; Ørtenblad, Niels; Larsen, Filip J; Schiffer, Tomas A; Willis, Sarah J; Gelabert-Rebato, Miriam; Perez-Valera, Mario; Boushel, Robert; Calbet, Jose AL; Holmberg, Hans-Christer (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09-30)
      To elucidate the mechanisms underlying the differences in adaptation of arm and leg muscles to sprint training, over a period of 11 days 16 untrained men performed six sessions of 4–6 × 30-s all-out sprints (SIT) with the legs and arms, separately, with a 1-h interval of recovery. Limb-specific VO2peak, sprint performance (two 30-s Wingate tests with 4-min recovery), muscle efficiency and ...