Abstract
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±8.2 kg) 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.
Key words
pedaling exercise - mechanomyography - frequency-based test - exercise intensity domains
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Correspondence
Jorge M. Zuniga
University of Nebraska-Lincoln
Nutrition and Health Sciences
110 Ruth Leverton Hall
68583-0806 Lincoln
United States
Phone: +1/402/472 2690
Fax: +1/402/472 2690
Email: jzuniga2@unlserve.unl.edu
