Ventilatory Pattern Influences Tolerance to Normobaric Hypoxia in Healthy Adults

Inés Albertus-Cámara (), Cristina Rochel-Vera, Jose-Luis Lomas-Albaladejo, Vicente Ferrer-López and Ignacio Martínez-González-Moro
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Inés Albertus-Cámara: Research Group of Physical Exercise and Human Performance, Mare Nostrum Campus, University of Murcia, 30100 Murcia, Spain
Cristina Rochel-Vera: Research Group of Physical Exercise and Human Performance, Mare Nostrum Campus, University of Murcia, 30100 Murcia, Spain
Jose-Luis Lomas-Albaladejo: Research Group of Physical Exercise and Human Performance, Mare Nostrum Campus, University of Murcia, 30100 Murcia, Spain
Vicente Ferrer-López: Research Group of Physical Exercise and Human Performance, Mare Nostrum Campus, University of Murcia, 30100 Murcia, Spain
Ignacio Martínez-González-Moro: Research Group of Physical Exercise and Human Performance, Mare Nostrum Campus, University of Murcia, 30100 Murcia, Spain

IJERPH, 2023, vol. 20, issue 6, 1-13

Abstract: Introduction: Tolerance to breathing in conditions with a decreased oxygen ratio is subject-specific. A normobaric hypoxia tolerance test (NHTT) is performed to assess the ability of each individual, as this may be influenced by genetic or personal factors such as age or gender. The aim of this study is to test the influence of deep breathing on hypoxia tolerance time. Material and methods: A total of 45 subjects (21 parachutists and 24 students) performed two NHTTs at 5050 m altitude (iAltitude). Arterial (SatO 2 ) and muscle (SmO 2 ) oxygen saturation were monitored with the Humon Hex ® device. The first NHTT was performed with free breathing, without any instructions; and the second NHTT was performed with wide, slow, diaphragmatic breathing. The NHTT was terminated at the end of 10 min or when a value of less than 83% was obtained. Results: The first NHTT was completed by 38.1% of parachutist and 33.3% of students while the second NHTT was completed by 85.7% and 75%, respectively. In the second NHTT, both parachutists and students had a significantly ( p = 0.001) longer duration compared to the first NHTT. SmO 2 and SatO 2 values also increased significantly ( p < 0.001) in both groups ( p < 0.05). Conclusion: Performing controlled diaphragmatic breathing is successful in increasing hypoxia tolerance time and/or SatO 2 values.

Keywords: hypoxia; hypoxia tolerance test; controlled breathing; ventilatory; parachutists (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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