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  • 1.
    Fransson, Dan
    et al.
    University of Gothenburg.
    Nielsen, Tobias Schmidt
    Univ Copenhagen, Denmark.
    Olsson, Karl
    Linnaeus University, Faculty of Health and Life Sciences, Department of Health and Caring Sciences.
    Christensson, Tobias
    University of Gothenburg.
    Bradley, Paul S.
    Liverpool John Moores Univ, UK.
    Fatouros, Ioannis G.
    Univ Thessaly, Greece.
    Krustrup, Peter
    Univ Southern Denmark, Denmark;Univ Exeter, UK.
    Nordsborg, Nikolai Baastrup
    Univ Copenhagen, Denmark.
    Mohr, Magni
    University of Gothenburg;Univ Southern Denmark, Denmark;Univ Faroe Isl, Denmark.
    Skeletal muscle and performance adaptations to high-intensity training in elite male soccer players: speed endurance runs versus small-sided game training2018In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 118, no 1, p. 111-121Article in journal (Refereed)
    Abstract [en]

    To examine the skeletal muscle and performance responses across two different exercise training modalities which are highly applied in soccer training. Using an RCT design, 39 well-trained male soccer players were randomized into either a speed endurance training (SET; n = 21) or a small-sided game group (SSG; n = 18). Over 4 weeks, thrice weekly, SET performed 6-10 x 30-s all-out runs with 3-min recovery, while SSG completed 2 x 7-9-min small-sided games with 2-min recovery. Muscle biopsies were obtained from m. vastus lateralis pre and post intervention and were subsequently analysed for metabolic enzyme activity and muscle protein expression. Moreover, the Yo-Yo Intermittent Recovery level 2 test (Yo-Yo IR2) was performed. Muscle CS maximal activity increased (P < 0.05) by 18% in SET only, demonstrating larger (P < 0.05) improvement than SSG, while HAD activity increased (P < 0.05) by 24% in both groups. Na+-K+ ATPase alpha(1) subunit protein expression increased (P < 0.05) in SET and SSG (19 and 37%, respectively), while MCT4 protein expression rose (P < 0.05) by 30 and 61% in SET and SSG, respectively. SOD2 protein expression increased (P < 0.05) by 28 and 37% in SET and SSG, respectively, while GLUT-4 protein expression increased (P < 0.05) by 40% in SSG only. Finally, SET displayed 39% greater improvement (P < 0.05) in Yo-Yo IR2 performance than SSG. Speed endurance training improved muscle oxidative capacity and exercise performance more pronouncedly than small-sided game training, but comparable responses were in muscle ion transporters and antioxidative capacity in well-trained male soccer players.

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