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Prediction of time‐to‐exhaustion in the first dorsal interosseous muscle from early changes in surface electromyography parameters

Introduction: In this study we evaluated the precision of the time‐to‐exhaustion (Tlim) prediction from the early changes in surface electromyography (sEMG) of the first dorsal interosseous muscle. Methods: Thirty subjects performed an index finger isometric abduction at 35% of maximal voluntary contraction (MVC) until exhaustion. Ten participants performed the same exercise at 50% MVC 1 week later. Changes in sEMG parameters across time were modeled using the area‐ratio and the linear regression slope. Tlim was plotted as a function of each of these indices of change, and the coefficient of determination (R2) was determined. Results: Null to moderate R2 (0.22 and 0.56 at 35% and 50% MVC, respectively) values were calculated. The best Tlim estimation led to a high prediction error (21.6 ± 15.0% of Tlim for the 50% MVC task). Conclusions: Although the prediction of time‐to‐exhaustion is an appealing research topic, these results suggest that it cannot be done solely from sEMG. Muscle Nerve 45: 835–840, 2012