Live high-train low guided by daily heart rate variability in elite Nordic-skiers.

Details

Serval ID
serval:BIB_ACC56C9290E6
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Live high-train low guided by daily heart rate variability in elite Nordic-skiers.
Journal
European journal of applied physiology
Author(s)
Schmitt L., Willis S.J., Fardel A., Coulmy N., Millet G.P.
ISSN
1439-6327 (Online)
ISSN-L
1439-6319
Publication state
Published
Issued date
02/2018
Peer-reviewed
Oui
Volume
118
Number
2
Pages
419-428
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
To analyze if live high-train low (LHTL) effectiveness is improved when daily training is guided by heart rate variability (HRV).
Twenty-four elite Nordic skiers took part in a 15-day LHTL study and were randomized into a HRV-guided training hypoxic group (H-HRV, n = 9, sleeping in normobaric hypoxia, FiO2 = 15.0%) and two predefined training groups sleeping either in hypoxia (H, n = 9, FiO2 = 15.0%) or normoxia (N, n = 6). HRV and training loads (TL) were recorded daily. Prior (Pre), one (Post-1), and 21 days (Post-21) following LHTL, athletes performed a 10-km roller-ski test, and a treadmill test for determination of [Formula: see text] was performed at Pre and Post-1.
Some HRV parameters measured in supine position were different between H-HRV and H: low and high (HF) frequency power in absolute (ms2) (16.0 ± 35.1 vs. 137.0 ± 54.9%, p = 0.05) and normalized units (- 3.8 ± 10.1 vs. 53.0 ± 19.5%, p = 0.02), HF(nu) (6.3 ± 6.8 vs. - 13.7 ± 8.0%, p = 0.03) as well as heart rate (3.7 ± 6.3 vs. 12.3 ± 4.1%, p = 0.008). At Post-1, [Formula: see text] was improved in H-HRV and H (3.8 ± 3.1%; p = 0.02 vs. 3.0 ± 4.4%; p = 0.08) but not in N (0.9 ± 5.1%; p = 0.7). Only H-HRV improved the roller-ski performance at Post-21 (- 2.7 ± 3.6%, p = 0.05).
The daily individualization of TL reduced the decrease in autonomic nervous system parasympathetic activity commonly associated with LHTL. The improved performance and oxygen consumption in the two LHTL groups confirm the effectiveness of LHTL even in elite endurance athletes.

Keywords
Endurance performance, HRV, Hypoxia
Pubmed
Web of science
Create date
10/01/2018 11:06
Last modification date
20/08/2019 15:16
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