Ventilatory Pattern Influences Tolerance to Normobaric Hypoxia in Healthy Adults

Albertus-Cámara, Inés; Rochel-Vera, Cristina; Lomas-Albaladejo, Jose-Luis; Ferrer-López, Vicente; González-Moro, Ignacio Martínez

doi:10.3390/ijerph20064935

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…SatO 2 was monitored through a pulse oximeter placed on the left ear, HR with the Polar H10® heart rate monitor and muscle oxygen saturation (SmO 2 ) with the Humon Hex® device placed in the middle of the right quadriceps (Albertus-Cámara et al, 2023).…”

Section: Hypoxia Tolerance Testmentioning

confidence: 99%

Analysis of the factors of heart rate variability affected after a hypoxia tolerance test as a function of gender

Rochel Vera,

Albertus Cámara,

Martínez González-Moro

2024

Retos

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Heart rate variability (HRV), the variation of time intervals between heartbeats, reflects the result of the interaction between the autonomic nervous system and the cardiovascular system. Hypoxia is a stressor that causes changes in HRV and a decrease in arterial oxygen saturation (SaO2). The aim of our study is to analyse if the time and frequency domains of HRV are affected after a hypoxia tolerance test in healthy participants as a function of gender. Material and methods: 23 healthy volunteers (11 women and 12 men) with a mean age of 23.08±2.99 performed a hypoxia tolerance test (11%, 5050 m) with the iAltitude simulator. Heart rate and SaO2 were monitored during the test and HRV frequency domain (FD) and time domain (TD) data were obtained. We analysed the five minutes before and after each session. Outcomes: Simulated altitude-induced hypoxia can cause changes in HRV in a group of healthy individuals. Statistically significant differences were also found between before and after the normobaric hypoxia test in the time-domain variables RRm, SDNN, HRm, HR STD, pNN50. In addition, in women statistically significant differences were found in RMSSD, and in the frequency-domain variables HF and LF/HF. While in males, statistically significant differences were found in SDNN. In both men and women, significant differences were observed in RRm, HRm and pNN50. Conclusion: The differences found in HRV after the hypoxia tolerance test indicate that females show a greater activation of the parasympathetic nervous system compared to males. While males showed greater sympathetic activation. Keywords: Heart rate variability, normobaric hypoxia, stress, autonomic nervous system.

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Section: Hypoxia Tolerance Testmentioning

confidence: 99%

Analysis of the factors of heart rate variability affected after a hypoxia tolerance test as a function of gender

Rochel Vera,

Albertus Cámara,

Martínez González-Moro

2024

Retos

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“…NHTTs subject the individual to a low and constant inspired fraction of oxygen, FiO 2 , for a certain period, observing the decrease in SpO 2 and the clinical response of the subject [ 6 ]. Thus, NHTTs end when the established time is fulfilled without reaching the safe SpO 2 value or when the subject reaches the minimum agreed SpO 2 value [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Muscle Oxygenation after a Normobaric Hypoxia Tolerance Test

Albertus-Cámara,

Paredes-Ruiz,

Martínez-González-Moro

2024

JFMK

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The aim of this work was to analyze the influence of acute normobaric hypoxia on quadricep oxygenation. Muscle oxygen saturation (SmO2) was measured using near-infrared spectrometry (NIRS) technology during a normobaric hypoxia tolerance test (NHTT). SmO2 was measured with a Humon Hex® device. In total, 54 healthy subjects participated, 68.5 of which were males and 31.5% of which were females. They performed an NHTT with the IAltitude® simulator, breathing air with an FiO2 level of 11% (equivalent to 5050 m). The maximum duration of the NHTT was set at 10 min, stopping if it reached 83% SpO2. The initial values (PRE) were compared with those obtained at the end of the test (POST) and after 10 min of recovery. The participants were divided into two groups based on whether (G1) they completed the ten minutes or not (G2). In total, 35.1% of men and 41.2% of women completed the 10 min. In both groups, significant differences were observed in the decrease in SmO2 values (p < 0.0001) (G1: PRE = 59.5 ± 12.48%; POST = 55.95 ± 14.30%; G2: PRE = 60.06 ± 13.46%; POST = 57.2 ± 12.3%). There were no differences between groups in any of the three periods. Exposure to normobaric hypoxia produces a decrease in quadricep levels of SmO2 in both sexes, regardless of whether the test is completed. Two patterns appeared: A.—less time and more hypoxia; B. a longer duration and less hypoxia.

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Ventilatory Pattern Influences Tolerance to Normobaric Hypoxia in Healthy Adults

Cited by 2 publications

References 36 publications

Analysis of the factors of heart rate variability affected after a hypoxia tolerance test as a function of gender

Analysis of the factors of heart rate variability affected after a hypoxia tolerance test as a function of gender

Analysis of Muscle Oxygenation after a Normobaric Hypoxia Tolerance Test

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