A mechanomyographic fatigue threshold test for cycling

J. M. Zuniga, T. J. Housh, C. L. Camic, C. R. Hendrix, R. J. Schmidt, M. Mielke, G. O. Johnson

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The purposes of this study were twofold: 1) to derive the mechanomyographic mean power frequency fatigue threshold (MMG MPFFT) for submaximal cycle ergometry; and 2) to compare the power outputs associated to the MMG MPFFT to other neuromuscular and gas exchange fatigue thresholds. 9 adults (5 men and 4 women; mean±SD age=23.7±3.7 years; body weight=66.3±8.2kg) performed an incremental cycle ergometry test to exhaustion while expired gas samples, electromyographic (EMG), and MMG signals were measured from the vastus lateralis muscle. The non-significant correlations (r=0.17 to 0.66; p>0.05) among the physical working capacity at the fatigue threshold (PWCFT), MMG MPFFT, and gas exchange threshold (GET) suggested that different physiological mechanisms may underlie these 3 fatigue thresholds. A significant correlation (r=0.83) for the MPFFT vs. respiratory compensation point (RCP) suggested that these fatigue thresholds may be mediated by a common physiological mechanism. In addition, the significantly lower mean values found for the PWCFT (mean±SD=163±43 W), MMG MPFFT (132±33 W), and GET (144±28 W) than MPFFT (196±53 W) and RCP (202±41 W) suggested that these gas exchange and neuromuscular fatigue thresholds may demarcate different exercise intensity domains.

Original languageEnglish (US)
Pages (from-to)636-643
Number of pages8
JournalInternational Journal of Sports Medicine
Issue number9
StatePublished - 2010


  • exercise intensity domains
  • frequency-based test
  • mechanomyography
  • pedaling exercise

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation


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