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Does resistive loading decrease diaphragmatic contractility before task failure?

F Laghi1, A Topeli, M J Tobin

  • 1Division of Pulmonary and Critical Care Medicine, Edward Hines, Jr., Veterans Administration Hospital, and Loyola University of Chicago Stritch School of Medicine, Hines, Illinois 60141, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 8, 1998
PubMed
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Diaphragmatic fatigue develops progressively during sustained loading, even before task failure. Respiratory muscle recruitment patterns also change over time, with incomplete recovery even after 20 hours.

Area of Science:

  • Physiology
  • Respiratory Mechanics
  • Exercise Science

Background:

  • Diaphragmatic fatigue is a critical factor in respiratory muscle function.
  • The precise timing of diaphragmatic fatigue onset relative to task failure remains unclear.

Purpose of the Study:

  • To investigate whether diaphragmatic contractility decreases progressively during sustained mechanical loading before task failure.
  • To examine changes in respiratory muscle recruitment patterns and diaphragmatic contractility over time and after recovery.

Main Methods:

  • Ten subjects performed a task requiring 60% of maximal transdiaphragmatic pressure (Pdimax) for set durations or until task failure.
  • Measurements included Pdimax, twitch pressures (Pditw), and respiratory muscle recruitment during a CO2 challenge at various time points.

Related Experiment Videos

  • Assessments were conducted before loading, after 2 and 4 minutes of loading, after task failure, and after a ~20-hour recovery period.

    • Main Results:

    • Potentiated Pditw and Pdimax decreased after 2 minutes of loading, with further reductions at 4 minutes and task failure.
    • Non-potentiated Pditw decreased after 4 minutes and task failure.
    • Gastric pressure contribution to breathing decreased, while expiratory muscle recruitment increased progressively with loading duration.
    • Respiratory muscle recruitment and diaphragmatic contractility changes were not fully normalized after ~20 hours of rest.

    Conclusions:

    • The diaphragm exhibits progressive fatigue during sustained mechanical loading, preceding task failure.
    • Sustained loading alters respiratory muscle recruitment strategies, with increased reliance on expiratory muscles.
    • Incomplete recovery of diaphragmatic contractility and respiratory muscle recruitment patterns occurs even after extended rest.