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  • 1. Born, Dennis
    et al.
    Stöggl, Thomas
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Swarén, Mikael
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Sperlich, Billy
    Björklund, Glenn
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Is heart rate a valid measure to monitor exercise intensity during trail running in undulating terrain?2015Konferensbidrag (Refereegranskat)
  • 2.
    Born, DP
    et al.
    Department of Sport Science, University of Würzburg.
    Faiss, R
    ISSUL-Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Switzerland.
    Willis, Sarah
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Strahler, J
    University of Marburg, Clinical Biopsychology, Marburg, Germany.
    Holmberg, Hans-Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Millet, GP
    ISSUL-Department of Physiology, Faculty of Biology and Medicine, University of Lausanne, Switzerland.
    Sperlich, Billy
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Repeated Sprint Training By Elite Cross-Country Skiers Under Hypoxic Conditions Does Not Influence Their Mucosal Immune Function To A Greater Extent Than Identical Normoxic Training2014Ingår i: Proceedings of the 19th Annual Congress of the ECSS, 2014, s. 3-Konferensbidrag (Refereegranskat)
  • 3.
    Sperlich, Billy
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap. Department of Sport Science University of Würzburg, Würzburg, Germany.
    Osman-Reinkens, S
    Institute of Training Science and Sport Informatics, German Sport University, Cologne, Germany.
    Zinner, Christoph
    Institute of Training Science and Sport Informatics, German Sport University, Cologne, Germany.
    Krueger, M
    Institute of Training Science and Sport Informatics, German Sport University, Cologne, Germany.
    Holmberg, Hans-Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Cardiorespiratory, metabolic and hormonal responses during open-wheel indoor kart racing2014Ingår i: Journal of Sports Medicine and Physical Fitness, ISSN 0022-4707, E-ISSN 1827-1928, Vol. 54, nr 4, s. 475-480Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    AIM: This study aimed to quantify the cardiorespiratory, metabolic and hormonal responses of elite open-wheel indoor kart racers.METHODS: Ten male racers (age: 21±3 yrs; height: 1.92±0.06 m, body mass: 76.0±5.9 kg) participated in a racing tournament. Their peak oxygen uptake and heart rate were assessed by a ramp test (100 W, increase 30 W·min-1) in the laboratory. During the racing itself, the cardio-respiratory and accelerometer values were recorded and pre- and post-race levels of blood lactate and salivary cortisol were determined.RESULTS: The average peak values for all of the drivers with respect to oxygen uptake and heart rate were 4.5±0.8 L·min-1 (56.7±7.9 mL·min-1·kg-1) and 193±5 beats·min-1, respectively. Overall, 28.3±3.3 laps were completed during 30-min of racing. Acceleration forces for the entire test averaged 1.20±0.51 G (maximum: 3.30 G), declining from the first 10 min until the end of racing (P<0.03). The oxygen uptake (~20 mL·min-1·kg-1), heart rate (~133 beats·min-1), respiratory exchange ratio (~0.96) and ventilation (~70 L·min-1) observed indicated moderate cardio-respiratory responses. Blood lactate concentration was significantly higher after the race than before but remained at <2 mmol·L-1 (P<0.01; effect size: 1.62).CONCLUSION: There were no differences between salivary cortisol levels before and after the race (P<0.06; effect size: 0.49). Directly after the race, the drivers rated their perceived exertion on Borg’s scale as 11.1±1.3. The present data revealed that the psycho-physical exertion associated with a 30-min open-wheel indoor kart race is moderate.

  • 4.
    Zinner, C.
    et al.
    Univ Wurzburg, Dept Sport Sci, Judenbuhlweg 11, D-97082 Wurzburg, Germany.
    Krueger, M.
    German Sport Univ Cologne, Inst Training Sci & Sport Informat, Sportpk Mungersdorf 6, D-50933 Cologne, Germany.
    Reed, J. L.
    Univ Ottawa, Fac Hlth Sci, Ottawa, ON K1N 6N5, Canada.
    Kohl-Bareis, M.
    Univ Appl Sci Koblenz, RheinAhrCampus Remagen, Landau, Germany.
    Holmberg, Hans-Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Sperlich, Billy
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap. Univ Wurzburg, Dept Sport Sci, Judenbuhlweg 11, D-97082 Wurzburg, Germany.
    Exposure to a combination of heat and hyperoxia during cycling at submaximal intensity does not alter thermoregulatory responses2016Ingår i: Biology of Sport, ISSN 0860-021X, E-ISSN 2083-1862, Vol. 33, nr 1, s. 71-76Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this study, we tested the hypothesis that breathing hyperoxic air (FinO2 = 0.40) while exercising in a hot environment exerts negative effects on the total tissue level of haemoglobin concentration (tHb); core (T-core) and skin (T-skin) temperatures; muscle activity; heart rate; blood concentration of lactate; pH; partial pressure of oxygen (PaO2) and carbon dioxide; arterial oxygen saturation (SaO2); and perceptual responses. Ten well-trained male athletes cycled at submaximal intensity at 21 degrees C or 33 degrees C in randomized order: first for 20 min while breathing normal air (FinO2 = 0.21) and then 10 min with FinO2 = 0.40 (HOX). At both temperatures, SaO2 and PaO2, but not tHb, were increased by HOX. Tskin and perception of exertion and thermal discomfort were higher at 33 degrees C than 21 degrees C (p < 0.01), but independent of FinO2. Tcore and muscle activity were the same under all conditions (p > 0.07). Blood lactate and heart rate were higher at 33 degrees C than 21 degrees C. In conclusion, during 30 min of submaximal cycling at 21 degrees C or 33 degrees C, T-core, T-skin and T-body, tHb, muscle activity and ratings of perceived exertion and thermal discomfort were the same under normoxic and hyperoxic conditions. Accordingly, breathing hyperoxic air (FinO2 = 0.40) did not affect thermoregulation under these conditions.

  • 5.
    Zinner, Christoph
    et al.
    Univ Wurzburg, Dept Sport Sci, D-97070 Wurzburg, Germany.;Mid Sweden Univ, Dept Hlth Sci, Swedish Winter Sports Res Ctr, Ostersund, Sweden..
    Hauser, Anna
    Swiss Fed Inst Sport, Sect Elite Sport, Magglingen, Switzerland..
    Born, Dennis-Peter
    Univ Wurzburg, Dept Sport Sci, D-97070 Wurzburg, Germany..
    Wehrlin, Jon P.
    Swiss Fed Inst Sport, Sect Elite Sport, Magglingen, Switzerland..
    Holmberg, Hans-Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Sperlich, Billy
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap. Univ Wurzburg, Dept Sport Sci, D-97070 Wurzburg, Germany..
    Influence of Hypoxic Interval Training and Hyperoxic Recovery on Muscle Activation and Oxygenation in Connection with Double-Poling Exercise2015Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 10, nr 10, artikel-id e0140616Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Here, we evaluated the influence of breathing oxygen at different partial pressures during recovery from exercise on performance at sea-level and a simulated altitude of 1800 m, as reflected in activation of different upper body muscles, and oxygenation of the m. triceps brachii. Ten well-trained, male endurance athletes (25.3 +/- 4.1 yrs; 179.2 +/- 4.5 cm; 74.2 +/- 3.4 kg) performed four test trials, each involving three 3-min sessions on a double-poling ergometer with 3-min intervals of recovery. One trial was conducted entirely under normoxic (No) and another under hypoxic conditions (Ho; FiO2 = 0.165). In the third and fourth trials, the exercise was performed in normoxia and hypoxia, respectively, with hyperoxic recovery (HOX; FiO2 = 1.00) in both cases. Arterial hemoglobin saturation was higher under the two HOX conditions than without HOX (p<0.05). Integrated muscle electrical activity was not influenced by the oxygen content (best d = 0.51). Furthermore, the only difference in tissue saturation index measured via near-infrared spectroscopy observed was between the recovery periods during the NoNo and HoHOX interventions (P<0.05, d = 0.93). In the case of HoHo the athletes' P-mean declined from the first to the third interval (P < 0.05), whereas P-mean was unaltered under the HoHOX, NoHOX and NoNo conditions. We conclude that the less pronounced decline in P-mean during 3 x 3-min double-poling sprints in normoxia and hypoxia with hyperoxic recovery is not related to changes inmuscle activity or oxygenation. Moreover, we conclude that hyperoxia (FiO2 = 1.00) used in conjunction with hypoxic or normoxic work intervals may serve as an effective aid when inhaled during the subsequent recovery intervals.

  • 6.
    Zinner, Christoph
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Willis, Sarah
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Jonsson, Malin
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Sperlich, Billy
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Holmberg, Hans-Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Avdelningen för hälsovetenskap.
    Heart rate responses during biathlon races of different lengths in elite athletes2014Ingår i: Science & Skiing VI / [ed] Erich Muller, Josef Kroll, Stefan Lindinger, Meyer & Meyer Sport, 2014, s. 483-494Kapitel i bok, del av antologi (Refereegranskat)
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