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Expiratory muscle fatigue impairs exercise performance.

S Verges1, Y Sager, C Erni

  • 1Institute of Physiology and Center for Integrative Human Physiology (ZIHP), University of Zurich, Zurich, Switzerland.

European Journal of Applied Physiology
|June 5, 2007
PubMed
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Exhaustive exercise can cause expiratory muscle fatigue (EMF), which significantly impairs running performance and reduces endurance. This study demonstrates that EMF negatively impacts exercise capacity, similar to inspiratory muscle fatigue.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Respiratory Medicine

Background:

  • High-intensity exercise can induce fatigue in both inspiratory and expiratory muscles.
  • Previous research indicates inspiratory muscle fatigue (IMF) negatively affects exercise performance.
  • The impact of expiratory muscle fatigue (EMF) on subsequent exercise performance remains less understood.

Purpose of the Study:

  • To investigate the effects of induced expiratory muscle fatigue (EMF) on subsequent exercise performance in healthy young men.

Main Methods:

  • Twelve healthy males completed 12-minute running tests on a 400m track.
  • Tests were conducted with and without prior induction of EMF, with EMF defined as a >=20% drop in maximal expiratory mouth pressure.
  • Participants performed a preliminary trial, two EMF trials, and two control trials in a randomized, alternate-order sequence.

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Main Results:

  • Running distance covered in 12 minutes was significantly reduced with prior EMF compared to control conditions (2872m vs. 2957m, P=0.002).
  • Running speed was consistently lower by 0.13 m/s throughout the exercise with prior EMF.
  • A significant correlation was found between the degree of EMF and the reduction in running distance (r2=0.528, P=0.007).
  • Perceived respiratory exertion was higher, and heart rate was lower during exercise with prior EMF.

Conclusions:

  • Induced expiratory muscle fatigue (EMF) impairs subsequent exercise performance in healthy young men.
  • EMF negatively affects endurance capacity, mirroring findings for inspiratory muscle fatigue (IMF).
  • The results highlight the significant role of expiratory muscles in maintaining exercise performance during exhaustive activities.