Files and links (1)
CC BY V4.0, Open Access
Journal article
Systemic hypoxia has a larger effect on reducing the external load at lower exercise intensity during heart rate clamped cycling
European journal of sport science, Early View
2024
PMID: 39622703
Abstract
The effects of acute hypoxic exposure on mechanical output and internal responses during cycling with heart rate (HR) clamped at lactate thresholds 1 and 2 (LT1 and LT2, respectively) were investigated. On separate days, 12 trained males cycled for 15 min at a clamped HR corresponding to LT1 and LT2 under normoxic or hypoxic conditions (simulated altitude of ∼3500 m and inspired oxygen fraction of 13.6%). Power output (PO), arterial oxygen saturation, ventilatory and perceptual responses were measured every 3 min, with metabolic response assessed pre- and post-exercise. At LT1, PO was consistently lower in hypoxia compared to normoxia (p < 0.01). At LT2, PO was not different between normoxia and hypoxia at 3 and 6 min (both p > 0.42) but was significantly lower in hypoxia at 9, 12 and 15 min (all p < 0.04). Overall, hypoxia induced a greater decrease in PO at LT1 (-33.3% ± 11.3%) than at LT2 (-18.0 ± 14.7%) compared to normoxia. Ventilatory, perceptual and metabolic responses were influenced by exercise intensity (all p < 0.01) but not environmental conditions (all p > 0.17). A simulated altitude of ∼3500 m is more effective in reducing cycling PO at LT1 than LT2 during HR clamped cycling while maintaining other internal loads. Therefore, normobaric hypoxia provides a greater benefit via a larger decrease in the mechanical constraints of exercise at lower exercise intensities.
Details
- Title
- Systemic hypoxia has a larger effect on reducing the external load at lower exercise intensity during heart rate clamped cycling
- Authors/Creators
- Siu Nam Li - The University of Western AustraliaPeter Peeling - The University of Western AustraliaBrendan R Scott - Murdoch University, Centre for Healthy AgeingJeremiah J Peiffer - Murdoch University, Centre for Healthy AgeingAlex Shaykevich - The University of Western AustraliaOlivier Girard - The University of Western Australia
- Publication Details
- European journal of sport science, Early View
- Publisher
- Wiley-VCH GmbH on behalf of European College of Sport Science.
- Number of pages
- 7
- Grant note
- APP1196462 / National Health and Medical Research Council
- Identifiers
- 991005723868907891
- Copyright
- © 2024 The Author(s).
- Murdoch Affiliation
- Centre for Healthy Ageing
- Language
- English
- Resource Type
- Journal article
Metrics
4 File views/ downloads
19 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.172 Sports Science
- 1.172.648 Exercise Physiology
- Web Of Science research areas
- Sport Sciences
- ESI research areas
- Clinical Medicine