Journal article
Sessional work-rate does not affect the magnitude to which simulated hypoxia can augment acute physiological responses during resistance exercise
European Journal of Applied Physiology
2020
Abstract
Purpose
To investigate whether performing resistance exercise in hypoxia augments physiological and perceptual responses, and if altering work-rate by performing repetitions to failure compared to sub-maximally increases the magnitude of these responses.
Methods
Twenty male university students (minimum of 2 year resistance training experience) completed four sessions, two in hypoxia (fraction of inspired oxygen [FiO2] = 0.13), and two in normoxia (FiO2 = 0.21). For each condition, session one comprised three sets to failure of shoulder press and bench press (high work-rate session), while session two involved the same volume load, distributed over six sets (low work-rate session). Muscle oxygenation (triceps brachii), surface electromyographic activity (anterior deltoid, pectoralis major, and triceps brachii), heart rate (HR), and arterial blood oxygen saturation were recorded. Blood lactate concentration ([Bla−]) was recorded pre-exercise and 2 min after each exercise. Muscle thickness was measured pre- and post-exercise via ultrasound.
Results
Muscle oxygenation values during sets and inter-set rest periods were lower in hypoxia vs normoxia (p = 0.001). Hypoxia caused greater [Bla−] during the shoulder press of failure sessions (p = 0.003) and both shoulder press (p = 0.048) and bench press (p = 0.005) of non-failure sessions. Hypoxia increased HR during non-failure sessions (p < 0.001). There was no effect of hypoxia on muscular swelling, surface electromyographic activity, perceived exertion, or number of repetitions performed.
Conclusions
Hypoxia augmented metabolite accumulation, but had no impact on any other physiological or perceptual response compared to the equivalent exercise in normoxia. Furthermore, the magnitude to which hypoxia increased the measured physiological responses was not influenced by sessional work-rate.
Details
- Title
- Sessional work-rate does not affect the magnitude to which simulated hypoxia can augment acute physiological responses during resistance exercise
- Authors/Creators
- Thomas P. Walden (Author/Creator) - Murdoch UniversityOlivier Girard (Author/Creator) - The University of Western AustraliaAndrew M. Jonson (Author/Creator) - Murdoch UniversityAlasdair R. Dempsey (Author/Creator) - Murdoch UniversityKieran J. Marston (Author/Creator) - Murdoch UniversityBrendan R. Scott (Author/Creator) - Murdoch University
- Publication Details
- European Journal of Applied Physiology
- Publisher
- Springer Verlag
- Identifiers
- 991005540303807891
- Copyright
- © 2020 Springer Nature Switzerland AG.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Domestic collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.172 Sports Science
- 1.172.414 Training Optimization
- Web Of Science research areas
- Physiology
- Sport Sciences
- ESI research areas
- Clinical Medicine