Journal
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Volume 105, Issue 3, Pages 333-342Publisher
SPRINGER
DOI: 10.1007/s00421-008-0895-3
Keywords
Critical force (CF); Time to exhaustion (T(lim)); Electromyographic fatigue threshold (EMG(FT)); EMG amplitude
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The purpose of this study was twofold: (1) to determine if the mathematical model used for estimating the EMG(FT) during cycle ergometry was applicable to isometric muscle actions; and (2) to compare the mean torque level from the CF test to that of the EMG(FT) test. The CF was defined as the slope coefficient of the linear relationship between total isometric work (W (lim) in N m s) and time to exhaustion (T (lim)). The EMG(FT) was defined as the y-intercept of the isometric torque versus EMG fatigue curve slope coefficient relationship. There was a significant (p < 0.05) mean difference between CF (6.6 +/- A 3.2 N m) and EMG(FT) (10.9 +/- A 4.7 N m). The results of the present study suggested that, during isometric muscle actions of the forearm flexors, fatigue thresholds estimated from the W (lim) versus T (lim) relationship (CF) are different from those estimated from electromyographic fatigue curves (EMG(FT)).
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