Separate and combined effects of local and systemic hypoxia in resistance exercise.

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State: Public
Version: author
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Serval ID
serval:BIB_93710B175C28
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Separate and combined effects of local and systemic hypoxia in resistance exercise.
Journal
European journal of applied physiology
Author(s)
Girard O., Willis S.J., Purnelle M., Scott B.R., Millet G.P.
ISSN
1439-6327 (Electronic)
ISSN-L
1439-6319
Publication state
Published
Issued date
10/2019
Peer-reviewed
Oui
Volume
119
Number
10
Pages
2313-2325
Language
english
Notes
Publication types: Journal Article ; Randomized Controlled Trial
Publication Status: ppublish
Abstract
This study quantified performance, physiological, and perceptual responses during resistance exercise to task failure with blood flow restriction (BFR), in systemic hypoxia, and with these stimuli combined.
Fourteen young men were tested for 1-repetition maximum (1RM) in the barbell biceps curl and lying triceps extension exercises. On separate visits, subjects performed exercise trials (4 sets to failure at 70% 1RM with 90 s between sets) in six separate randomized conditions, i.e., in normoxia or hypoxia (fraction of inspired oxygen = 20.9% and 12.9%, respectively) combined with three different levels of BFR (0%, 45%, or 60% of resting arterial occlusion pressure). Muscle activation and oxygenation were monitored via surface electromyography and near-infrared spectroscopy, respectively. Arterial oxygen saturation, heart rate, and perceptual responses were assessed following each set.
Compared to set 1, the number of repetitions before failure decreased in sets 2, 3, and 4 for both exercises (all P < 0.001), independently of the condition (P > 0.065). Arterial oxygen saturation was lower with systemic hypoxia (P < 0.001), but not BFR, while heart rate did not differ between conditions (P > 0.341). Muscle oxygenation and activation during exercise trials remained unaffected by the different conditions (all P ≥ 0.206). A significant main effect of time, but not condition, was observed for overall perceived discomfort, difficulty breathing, and limb discomfort (all P < 0.001).
Local and systemic hypoxic stimuli, or a combination of both, did not modify the fatigue-induced change in performance, trends of muscle activation or oxygenation, nor exercise-related sensations during a multi-set resistance exercise to task failure.
Keywords
Exercise Tolerance, Heart Rate, Humans, Hypoxia/physiopathology, Ischemic Preconditioning/adverse effects, Ischemic Preconditioning/methods, Male, Muscle, Skeletal/blood supply, Muscle, Skeletal/physiology, Oxygen Consumption, Resistance Training/adverse effects, Resistance Training/methods, Respiration, Young Adult, Muscle activation, Muscle oxygenation, Strength training, Systemic hypoxia, Task failure, Vascular occlusion
Pubmed
Create date
17/09/2019 21:48
Last modification date
16/02/2021 7:26
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