Effect of acute normobaric hypoxia on the ventilatory threshold

Gallagher, Carla A.; Willems, Mark E. T.; Lewis, Mark P.; Myers, Stephen D.

doi:10.1007/s00421-014-2882-1

Cited by 4 publications

(2 citation statements)

References 39 publications

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“…8 , 38 The 8.8% decrease of PPO from GXTs was comparable to a previous study, with a 5.5% decrease when exposure to simulated hypoxia (FiO 2 = 0.142 or ∼3000 m) and a 11.1% decrease when exposure to higher simulated hypoxia (FiO 2 = 0.125 or ∼4000 m). 39 However, the observed decrease in PPO was less than what was reported by Ozcelik et al. (by 20.2%).…”

Section: Discussioncontrasting

confidence: 55%

Methods to match high-intensity interval exercise intensity in hypoxia and normoxia – A pilot study

Atakan

et al. 2022

Journal of Exercise Science & Fitness

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Objectives The aim of this study was to compare high-intensity interval exercise (HIIE) sessions prescribed on the basis of a maximal value (peak power output, PPO) and a submaximal value (lactate threshold, LT) derived from graded exercise tests (GXTs) in normoxia and hypoxia. Methods: A total of ten males (aged 18–37) volunteered to participate in this study. The experimental protocol consisted of a familiarization procedure, two GXTs under normoxia (FiO 2 = 0.209) and two GXTs under normobaric hypoxia (FiO2 = 0.140), and three HIIE sessions performed in a random order. The HIIE sessions included one at hypoxia (HY) and two at normoxia (one matched for the absolute intensity in hypoxia, designated as NA, and one matched for the relative intensity in hypoxia, designated as NR). Results: The data demonstrated that there was significant lower peak oxygen uptake (V̇O 2peak ), peak heart rate (HR peak ), PPO, and LT derived from GXTs in hypoxia, with higher respiratory exchange ratio (RER), when compared to those from GXTs performed in normoxia ( p < 0.001). Among the three HIIE sessions, the NA session resulted in lower percentage of HR peak (85.0 ± 7.5% vs 94.4 ± 5.0%; p = 0.002) and V̇O 2peak (74.1 ± 9.1% vs 88.7 ± 7.7%; p = 0.005), when compared to the NR session. HIIE sessions in HY and NR resulted in similar percentage of HR peak and V̇O 2peak , as well as similar rating of perceived exertion and RER. The blood lactate level increased immediately after all the three HIIE sessions ( p < 0.001), while higher blood lactate concentrations were observed immediately after the HY ( p = 0.0003) and NR (p = 0.014) sessions when compared with NA. Conclusion: Combining of PPO and LT derived from GXTs can be used to prescribe exercise intensity of HIIE in hypoxia.

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Section: Discussioncontrasting

confidence: 55%

Methods to match high-intensity interval exercise intensity in hypoxia and normoxia – A pilot study

Atakan

et al. 2022

Journal of Exercise Science & Fitness

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“…A ‘sham hypoxic’ condition was created during the normoxic trials to mask the environmental conditions. This involved maintaining the oxygen (O 2 ) controls to replicate auditory cues between conditions, a procedure previously used by Gallagher et al (2014). Participants entered the chamber 10 min prior to exercise to allow equilibrium between atmospheric and body O 2 stores (Andreassen and Rees 2005).…”

Section: Methodsmentioning

confidence: 99%

Determinants of curvature constant (W’) of the power duration relationship under normoxia and hypoxia: the effect of pre-exercise alkalosis

et al. 2017

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PurposeThis study investigated the effect of induced alkalosis on the curvature constant (W’) of the power-duration relationship under normoxic and hypoxic conditions.MethodsEleven trained cyclists (mean ± SD) Age: 32 ± 7.2 years; body mass (bm): 77.0 ± 9.2 kg; VO2peak: 59.2 ± 6.8 ml·kg−1·min−1 completed seven laboratory visits which involved the determination of individual time to peak alkalosis following sodium bicarbonate (NaHCO3) ingestion, an environment specific ramp test (e.g. normoxia and hypoxia) and four x 3 min critical power (CP) tests under different experimental conditions. Participants completed four trials: alkalosis normoxia (ALN); placebo normoxia (PLN); alkalosis hypoxia (ALH); and placebo hypoxia (PLH). Pre-exercise administration of 0.3 g.kg−1 BM of NaHCO3 was used to induce alkalosis. Environmental conditions were set at either normobaric hypoxia (FiO2: 14.5%) or normoxia (FiO2: 20.93%).ResultsAn increase in W’ was observed with pre-exercise alkalosis under both normoxic (PLN: 15.1 ± 6.2 kJ vs. ALN: 17.4 ± 5.1 kJ; P = 0.006) and hypoxic conditions (ALN: 15.2 ± 4.9 kJ vs. ALN: 17.9 ± 5.2 kJ; P < 0.001). Pre-exercise alkalosis resulted in a larger reduction in bicarbonate ion (HCO3 −) concentrations during exercise in both environmental conditions (p < 0.001) and a greater blood lactate accumulation under hypoxia (P = 0.012).ConclusionPre-exercise alkalosis substantially increased W’ and, therefore, may determine tolerance to exercise above CP under normoxic and hypoxic conditions. This may be due to NaHCO3 increasing HCO3 − buffering capacity to delay exercise-induced acidosis, which may, therefore, enhance anaerobic energy contribution.

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Effect of acute altitude exposure on ventilatory thresholds in recreational athletes

Schüttler

Weckbach

Hamm

et al. 2021

Respiratory Physiology & Neurobiology

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Effect of acute normobaric hypoxia on the ventilatory threshold

Abstract: The VT appears to be a suitable physiological parameter for exercise prescription in normobaric hypoxia up to an altitude of 4,000 m.

Cited by 4 publications

References 39 publications

Methods to match high-intensity interval exercise intensity in hypoxia and normoxia – A pilot study

Methods to match high-intensity interval exercise intensity in hypoxia and normoxia – A pilot study

Determinants of curvature constant (W’) of the power duration relationship under normoxia and hypoxia: the effect of pre-exercise alkalosis

Effect of acute altitude exposure on ventilatory thresholds in recreational athletes

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