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Electromyographic and Gas Exchange Fatigue Thresholds During Incremental Treadmill Running

Jorge Mario Zuniga, Matthew P. Bubak, Benjamin E. Fisher, Daniel E. Neighbors, Hannah S. Osowski, Amber N. Oyen


The purposes of this study were 1) to apply the computerized V-slope mathematical algorithm used to determine the anaerobic threshold (AT) and respiratory compensation point (RCP) to the amplitude content of the electromyographic (EMG) signal; and 2) to compare and correlate the VO2 and running velocity associated with the AT, RCP, and EMGV-slope. Twelve adults (eight men and four women; mean ± SD age = 23.5 ± 5.2 years; body weight = 76.6 ± 11.5 kg) performed an incremental treadmill test to exhaustion while the EMG signal was recorded from the vastus lateralis muscle and gas exchange parameters were collected. The computerized V-slope mathematical model successfully identified a breaking point for the EMG amplitude versus VO2 relationship during incremental treadmill running for all subjects in the study. The significant correlations and no mean differences between the AT and EMGV-slope suggested that these fatigue thresholds may be mediated by a common underlying physiological mechanism.

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