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Positive pressure breathing during rest and exercise.

E A den Hartog1, R Heus

  • 1Thermal Physiology Group, Department of Work Environment, TNO Human Factors, PO Box 23, 3769 ZG Soesterberg, The Netherlands. denhartog@tm.tno.nl

Applied Ergonomics
|March 12, 2003
PubMed
Summary

Commercial respiratory protection systems struggle to maintain positive pressure during heavy exercise. While not impacting ventilation or circulation, using these systems increased oxygen consumption.

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Area of Science:

  • Exercise Physiology
  • Respiratory Protection
  • Biomedical Engineering

Background:

  • Maintaining positive pressure in respiratory protection is crucial during strenuous activity.
  • Existing systems may not adequately support physiological demands of heavy exercise.

Purpose of the Study:

  • To investigate the feasibility of maintaining positive pressure with respiratory protection during heavy exercise.
  • To assess the impact on ventilation, circulation, and comfort.
  • To evaluate the effectiveness of commercial blower systems.

Main Methods:

  • Eight male subjects performed exercise at 80% maximum power.
  • A blower system was tested at various capacities and pressure levels (3 and 15 mbar).
  • Mouth pressure feedback was utilized to control the blower.

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Main Results:

  • The blower reduced negative pressure phases during breathing from 50% to 15% but did not eliminate them.
  • Negative pressures persisted across all blower settings during exercise.
  • Positive pressure breathing did not alter ventilation or circulation.
  • Oxygen consumption was elevated when using the blower and respirator.

Conclusions:

  • Current commercial blower systems are insufficient to guarantee positive pressure during intense exercise.
  • Positive pressure breathing did not negatively affect core physiological functions but increased metabolic cost.