Impact of 5 Days of Sprint Training in Hypoxia on Performance and Muscle Energy Substances

Abstract 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...

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Bibliographic Details
Published in:International journal of sports medicine 2017-11, Vol.38 (13), p.983-991
Main Authors: Kasai, Nobukazu, Kojima, Chihiro, Sumi, Daichi, Takahashi, Hideyuki, Goto, Kazushige, Suzuki, Yasuhiro
Format: Article
Language:English
Subjects:
Hypoxia
Spectrum analysis
Training & Testing
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Summary:Abstract 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 [F i O 2 ], 14.5%) or normoxic (NOR; F i O 2 , 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 (VO 2max ) tests were conducted. Muscle glycogen and PCr contents were evaluated using carbon magnetic resonance spectroscopy ( 13 C-MRS) and phosphorus magnetic resonance spectroscopy ( 31 P-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
ISSN:0172-4622
1439-3964
DOI:10.1055/s-0043-117413