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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Respiratory Mechanics

Background:

  • Positive expiratory pressure (PEEP) devices are used in respiratory therapy.
  • The impact of PEEP on maximal exercise performance is not fully understood.
  • Mouthpieces delivering PEEP may alter respiratory muscle loading during cycling.

Purpose of the Study:

  • To investigate the effect of a PEEP mouthpiece on maximal cycling performance in healthy adults.
  • To compare performance with a PEEP mouthpiece versus a standard mouthpiece and no mouthpiece.

Main Methods:

  • Two experiments were conducted with healthy adults performing graded cycling tests and endurance rides.
  • Participants used either a PEEP mouthpiece (PMP) or a control (CON) / no mouthpiece (NMP).
  • Key performance metrics included peak oxygen uptake (O2peak), oxygen pulse, time to exhaustion, and oxygen uptake at ventilatory threshold (O2@VT).

Main Results:

  • The PEEP mouthpiece (PMP) significantly increased O2peak, O2@VT, and GXT endurance time compared to both CON and NMP (p<0.05).
  • Oxygen pulse was also significantly higher with the PMP in both experiments (p<0.05).
  • Ventilatory threshold endurance ride time (VTER) showed a positive trend with the PMP.

Conclusions:

  • A PEEP mouthpiece confers a significant performance benefit during high-intensity cycling exercise in healthy adults.
  • The PMP enhances key physiological markers of aerobic capacity and endurance.
  • Further research should explore the mechanisms behind this performance improvement.