Anaerobic threshold determination by blood lactate and myoelectric signals.

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Abstract
The potential use of myoelectric signal analysis for determination of anaerobic threshold (AT) was examined. Ten college students performed incremental exercise on a bicycle ergometer during which blood samples from either the brachial or radial artery were drawn and corresponding intergrated electromyogram (IEMG) and power spectra also were recorded. Blood AT was determined by observing the changes in arterial blood lactate, PO2 [partial pressure of O2], PCO2 [partial pressure of CO2], HCO3- and pH. EMG AT was determined by the non-linear increase in IEMG and abrupt increase in frequency band width at 70% of the peak frequency (FRQ70%) which could represent the most active frequency band. A significant increase in FRQ70% evidently occurred immediately after the occurrence of blood AT (P < 0.05). No significant increase could be found in peak frequency. Regression analyses revealed that EMG AT .ovrhdot.VO2 [O2 consumption] correlated significantly with blood AT .ovrhdot.VO2 (r = 0.921, P < 0.001) and with gas exchange AT .ovrhdot.VO2 (r = 0.921, P < 0.001). Analysis of myoelectric signals, which reflect motor unit recruitment and discharge frequency, could provide a non-invasive estimate of AT.

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