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Oronasal breathing during exercise.

F Saibene, P Mognoni, C L Lafortuna

    Pflugers Archiv : European Journal of Physiology
    |December 15, 1978
    PubMed
    Summary
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    The shift to oronasal breathing (ONBS) in subjects is not solely due to nasal resistance. Psychological factors likely influence this breathing pattern change during exercise.

    Area of Science:

    • Physiology
    • Respiratory Medicine

    Background:

    • Breathing patterns can shift from nasal to oronasal during increased physical exertion.
    • Understanding the determinants of this shift is crucial for respiratory physiology.

    Purpose of the Study:

    • To investigate the factors influencing the shift from nasal to oronasal breathing (ONBS).
    • To determine if nasal resistance is the primary driver of ONBS during exercise.

    Main Methods:

    • Observed 73 subjects using two independent methods during exercise on a bicycle ergometer.
    • Measured ventilation at increasing workloads and assessed nasal resistance.
    • Utilized techniques with and without face masks for ventilation measurements.

    Main Results:

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  • The ventilation at which ONBS occurred was approximately 40.2 +/- 9.41 L/min (first method) and 44.2 +/- 13.51 L/min (second method).
  • Nasal resistance showed no direct correlation with the shift to ONBS.
  • Individual responses varied, with some subjects consistently using nasal breathing and others mouth breathing.

    • Conclusions:

    • ONBS is not solely determined by nasal resistance.
    • Psychological factors may play a significant role in the transition to oronasal breathing.
    • Indirect effects of hypoventilation on alveolar air composition cannot be entirely excluded.