Is Maximal Heart Rate Decrease Similar Between Normobaric Versus Hypobaric Hypoxia in Trained and Untrained Subjects?

Details

Serval ID
serval:BIB_5F364BCBF1B9
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Is Maximal Heart Rate Decrease Similar Between Normobaric Versus Hypobaric Hypoxia in Trained and Untrained Subjects?
Journal
High altitude medicine & biology
Author(s)
Mourot L., Millet G.P.
ISSN
1557-8682 (Electronic)
ISSN-L
1527-0297
Publication state
Published
Issued date
03/2019
Peer-reviewed
Oui
Volume
20
Number
1
Pages
94-98
Language
english
Notes
Publication types: Journal Article ; Review
Publication Status: ppublish
Abstract
We compared the decrease in maximal heart rate (HRmax) from normoxia to normobaric (NH) and hypobaric (HH) hypoxia, respectively, in trained and untrained subjects (n = 187). HRmax data in normoxia and NH (n = 55) or HH (n = 26) were collected from 81 publications. No study directly compared HRmax in NH and HH. Concomitant arterial oxygen saturation (SaO <sub>2</sub> ) and HRmax data were found in 60 studies. Overall, the results showed that the higher the desaturation, the greater the decrease in HRmax. Since desaturation appeared to be slightly higher during HH versus NH and was higher in trained than in untrained subjects, the decrease in HRmax tended (p = 0.07) to be higher in trained subjects in HH than in NH (e.g., -12.7 bpm vs. -8.6 bpm at 4000 m), whereas in untrained subjects the difference was negligible (-9.9 bpm vs. -8.3 bpm). To conclude, when compared with normoxia, the decrease in HRmax was slightly higher in HH than in NH in trained subjects. However, this result has to be confirmed and from a practical point of view, one may question the significance of this difference as well as the relevance of using different HR values for prescribing training intensity during exercise performed in NH or in HH.
Keywords
Adult, Altitude, Female, Heart Rate/physiology, Humans, Hypoxia/physiopathology, Male, Oxygen Consumption/physiology, Physical Fitness/physiology, altitude training, exercise physiology, exhaustion, natural vs. simulated altitude, oxygen saturation
Pubmed
Web of science
Create date
13/12/2018 17:41
Last modification date
14/10/2019 6:09
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