"Live High–Train Low and High" Hypoxic Training Improves Team-Sport Performance. Issue 10 (October 2015)

• Record Type: Journal Article
• Authors: BROCHERIE, FRANCK; MILLET, GRÉGOIRE P.; HAUSER, ANNA; STEINER, THOMAS; RYSMAN, JULIEN; WEHRLIN, JON P.; GIRARD, OLIVIER
• Is Part Of: Medicine and science in sports and exercise. Volume 47:Issue 10(2015)
• Publication Date: 2015-10
• Subjects: Sports medicine -- Periodicals; Exercise -- Physiological aspects -- Periodicals; Exercise -- Health aspects -- Periodicals; 612.044
• DOI: 10.1249/MSS.0000000000000630
• Languages: English
• ISSNs: 0195-9131

Abstract

<abstract> <title>ABSTRACT</title> <sec> <title>Purpose</title> <p>This study aims to investigate physical performance and hematological changes in 32 elite male team-sport players after 14 d of "live high–train low" (LHTL) training in normobaric hypoxia (≥14 h·d<sup>−1</sup> at 2800–3000 m) combined with repeated-sprint training (six sessions of four sets of 5 × 5-s sprints with 25 s of passive recovery) either in normobaric hypoxia at 3000 m (LHTL + RSH, namely, LHTLH; <italic>n</italic> = 11) or in normoxia (LHTL + RSN, namely, LHTL; <italic>n</italic> = 12) compared with controlled "live low–train low" (LLTL; <italic>n</italic> = 9) training.</p> </sec> <sec> <title>Methods</title> <p>Before (Pre), immediately after (Post-1), and 3 wk after (Post-2) the intervention, hemoglobin mass (Hb<sub>mass</sub>) was measured in duplicate [optimized carbon monoxide (CO) rebreathing method], and vertical jump, repeated-sprint (8 × 20 m–20 s recovery), and Yo-Yo Intermittent Recovery level 2 (YYIR2) performances were tested.</p> </sec> <sec> <title>Results</title> <p>Both hypoxic groups similarly increased their Hb<sub>mass</sub> at Post-1 and Post-2 in reference to Pre (LHTLH: +4.0%, <italic>P</italic> < 0.001 and +2.7%, <italic>P</italic> < 0.01; LHTL: +3.0% and +3.0%, both <italic>P</italic> < 0.001), whereas no change occurred in LLTL. Compared with Pre, YYIR2 performance increased by ∼21% at Post-1 (<italic>P</italic> < 0.01) and by ∼45% at Post-2 (<italic>P</italic> < 0.001), with no difference between the two intervention groups (vs no change in LLTL). From Pre to Post-1, cumulated sprint time decreased in LHTLH (−3.6%, <italic>P</italic> < 0.001) and LHTL (−1.9%, <italic>P</italic> < 0.01), but not in LLTL (−0.7%), and remained significantly reduced at Post-2 (−3.5%, <italic>P</italic> < 0.001) in LHTLH only. Vertical jump performance did not change.</p> </sec> <sec> <title>Conclusions</title> <p>"Live high–train low and high" hypoxic training interspersed with repeated sprints in hypoxia for 14 d (in season) increases the Hb<sub>mass</sub>, YYIR2 performance, and repeated-sprint ability of elite field team-sport players, with benefits lasting for at least 3 wk postintervention.</p> </sec> </abstract>