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Influence of Hypoxic Interval Training and Hyperoxic Recovery on Muscle Activation and Oxygenation in Connection with Double-Poling Exercise
Univ Wurzburg, Dept Sport Sci, D-97070 Wurzburg, Germany.;Mid Sweden Univ, Dept Hlth Sci, Swedish Winter Sports Res Ctr, Ostersund, Sweden..
Swiss Fed Inst Sport, Sect Elite Sport, Magglingen, Switzerland..
Univ Wurzburg, Dept Sport Sci, D-97070 Wurzburg, Germany..
Swiss Fed Inst Sport, Sect Elite Sport, Magglingen, Switzerland..
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2015 (Engelska)Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 10, nr 10, artikel-id e0140616Artikel i tidskrift (Refereegranskat) Published
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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.

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2015. Vol. 10, nr 10, artikel-id e0140616
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URN: urn:nbn:se:miun:diva-26570DOI: 10.1371/journal.pone.0140616ISI: 000363184600086PubMedID: 26468885Scopus ID: 2-s2.0-84949058109OAI: oai:DiVA.org:miun-26570DiVA, id: diva2:883436
Tillgänglig från: 2015-12-17 Skapad: 2015-12-17 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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