Hyperoxische Atemgase im Sporttauchen - Auswirkungen auf Herzfrequenz, Ventilation und Laktat unter Belastung: Oxygen-enriched air decreases ventilation during high-intensity fin-swimming underwater

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Oxygen-enriched air is commonly used in sport SCUBA-diving and might affect ventilation and heart rate, but only little work exists for applied diving settings. We hypothesized that ventilation is decreased especially during strenuous underwater fin-swimming when using oxygen-enriched air as breathing gas. Ten physically fit divers (age: 25 ± 4; 5 females; 67 ± 113 open-water dives) performed incremental underwater fin-swimming until exhaustion at 4 m water depth with either normal air or oxygen-enriched air (40 % O2) in a double-blind, randomized within-subject design. Heart rate and ventilation were measured throughout the dive and maximum whole blood lactate samples were determined post-exercise. ANOVAs showed a significant effect for the factor breathing gas (F(1, 9) = 7.52; P = 0.023; ƞ2p = 0.455) with a lower ventilation for oxygen-enriched air during fin-swimming velocities of 0.6 m·s-1 (P = 0.032) and 0.8 m·s-1 (P = 0.037). Heart rate, lactate, and the time to exhaustion showed no significant differences. These findings indicate decreased ventilation by an elevated oxygen fraction in the breathing gas when fin-swimming in shallow-water submersion with high velocity (> 0.5 m·s-1). Applications are within involuntary underwater exercise or rescue scenarios for all dives with limited gas supply.
Original languageGerman
Title of host publicationN.N.
Publication date31.10.2021
Publication statusPublished - 31.10.2021
EventWissenschaftliche Tagung der Gesellschaft für Tauch- und Überdruckmedizin - Online, Wiesbaden, Germany
Duration: 30.10.202131.10.2021
Conference number: 15

ID: 6254841

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