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Decompression induced nitrogen elimination.

A P Dick, R D Vann, G Y Mebane

    Undersea Biomedical Research
    |December 1, 1984
    PubMed
    Summary
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    A new method measures nitrogen elimination after air diving by breathing air, improving accuracy by isolating dive-absorbed nitrogen. Results showed exercise increased nitrogen elimination, though variability was noted.

    Area of Science:

    • Physiological and Environmental Effects of Diving
    • Biomedical Engineering
    • Gas Physiology

    Background:

    • Accurate measurement of inert gas elimination is crucial for understanding decompression sickness and optimizing dive profiles.
    • Previous methods for nitrogen elimination measurement often involved breathing gas mixtures that could affect baseline nitrogen levels.
    • The need for a more precise method to quantify nitrogen washout post-dive, particularly after air dives, is recognized in diving physiology.

    Purpose of the Study:

    • To develop and validate a novel method for measuring nitrogen elimination following air diving.
    • To assess the impact of exercise during a dive on post-dive nitrogen elimination.
    • To investigate the variability in nitrogen elimination measurements and identify potential contributing factors.

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    Main Methods:

    • A closed-circuit breathing apparatus with a spirometer was utilized to measure nitrogen elimination.
    • Subjects breathed air, maintaining a constant oxygen partial pressure (0.209 +/- 0.003 atm).
    • Nitrogen elimination was quantified by recording spirometer volume changes during breath-holds at functional residual capacity after dives to varying depths (60, 100, 130 fsw) under resting and exercising conditions.

    Main Results:

    • The developed method successfully generated nitrogen elimination curves based on spirometer volume increases.
    • Exercise during air diving led to an increased volume of nitrogen eliminated post-dive.
    • Significant variability in nitrogen elimination measurements was observed for both resting and exercising divers.

    Conclusions:

    • The new method provides a more accurate assessment of nitrogen elimination by excluding pre-existing nitrogen stores.
    • Exercise appears to enhance nitrogen washout, but the variability suggests other physiological factors are at play.
    • Potential causes for the observed variability in nitrogen elimination include bubble formation and alterations in tissue blood flow during and after diving.