Impact of 5 days of sprint training in hypoxia on performance and muscle energy substances

(Auswirkungen eines fünftägigen Sprinttrainings unter Hypoxiebedingungen auf die Leistung und die Energiesubstanzen der Muskulatur)

The present study was designed to determine the effect of 5 consecutive days of repeated sprint training under hypoxia on anaerobic performance and energy substances. Nineteen male sprinters performed repeated sprints for 5 consecutive days under a hypoxic (HYPO; fraction of inspired oxygen [FiO2], 14.5%) or normoxic (NOR; FiO2, 20.9%) condition. Before and after the training period, 10-s maximal sprint, repeated sprint ability (5×6-s sprints), 30-s maximal sprint, and maximal oxygen uptake (VO2max) tests were conducted. Muscle glycogen and PCr contents were evaluated using carbon magnetic resonance spectroscopy (13C-MRS) and phosphorus magnetic resonance spectroscopy (31P-MRS), respectively. The HYPO group showed significant increases in power output during the 10-s maximal sprint (P=0.004) and repeated sprint test (P=0.004), whereas the NOR group showed no significant change after the training period. Muscle glycogen and PCr contents increased significantly in both groups (P<0.05, respectively). However, relative increases were not significantly different between groups. These findings indicated that 5 consecutive days of repeated sprint training under hypoxic conditions increased maximal power output in competitive sprinters. Furthermore, short-term sprint training significantly augmented muscle glycogen and PCr contents with little added benefit from training in hypoxia.
© Copyright 2015 International Journal of Sports Medicine. Thieme. Alle Rechte vorbehalten.

Schlagworte: Sprint Leichtathletik Kurzstreckenlauf maximal Training Hypoxie Relation Leistung Energiestoffwechsel Energie Muskel Stoffwechsel
Notationen: Biowissenschaften und Sportmedizin Kraft-Schnellkraft-Sportarten
DOI: 10.1055/s-0043-117413
Veröffentlicht in: International Journal of Sports Medicine
Veröffentlicht: 2015
Jahrgang: 38
Heft: 13
Seiten: 983-991
Dokumentenarten: Artikel
Sprache: Englisch
Level: hoch