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Breathing pattern and lung volumes during exercise.

F Lind, C M Hesser

    Acta Physiologica Scandinavica
    |January 1, 1984
    PubMed
    Summary
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    During exercise, breathing patterns change. Inspiratory time (TI) and expiratory time (TE) adjust with ventilation (V) and tidal volume (VT), suggesting lung volume feedback regulates breath termination.

    Area of Science:

    • Respiratory Physiology
    • Exercise Physiology
    • Pulmonary Mechanics

    Background:

    • Understanding breathing control during exercise is crucial for assessing respiratory function.
    • Previous studies have explored relationships between ventilation, tidal volume, and breath timing, but mechanisms remain debated.

    Purpose of the Study:

    • To investigate the interrelationships of ventilation, tidal volume, and breath timing parameters during graded cycle exercise.
    • To identify how mean inspiratory and expiratory flows change with increasing ventilation.
    • To elucidate the role of lung volume feedback in regulating inspiratory termination.

    Main Methods:

    • Measurements of ventilation (V), tidal volume (VT), inspiratory (TI), expiratory (TE), and total breath (Ttot) durations were taken.

    Related Experiment Videos

  • Subjects performed graded cycle ergometry from 0 W to 200 W.
  • Analysis of relationships between lung volumes, breath timing, and flow rates.

    • Main Results:

    • The TI/Ttot ratio increased with ventilation (15-60 L/min).
    • VT-TI and VT-TE relationships showed three distinct ranges with breakpoints at specific tidal volumes.
    • Inspiratory and expiratory times showed linear relationships with end-inspiratory volume but complex relationships with end-expiratory volume.

    Conclusions:

    • Inspiratory termination during exercise appears to be influenced by volume-related afferent feedback from the lungs and chest wall.
    • This feedback mechanism is significant across both low and high tidal volume ranges during exercise.