This paper presents a Lempel-Ziv complexity measure for analysis of surface electromyography signals. The Lempel-Ziv measure provides a metric for the number of distinct deterministic patterns and the rate of their creation in signals. We propose a ternary Lempel-Ziv measure, improving upon the binary Lempel-Ziv measure, and making it more suited for the analysis of biological signals. The Lempel-Ziv measure is evaluated with a muscle fatigue experiment in which participants perform static, cyclic, and random contractions. Results show this complexity measure shows a greater correlation to a steadily increasing muscle fatigue level compared to the conventional median frequency. This measure is computationally easy to compute and does not require power spectrum estimation and signal stationarity assumptions.

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Keywords Dynamic contractions, Electromyography signal, Lempel-Ziv complexity measure, Muscle fatigue
Persistent URL
Journal Journal of Electromyography and Kinesiology
Talebinejad, M. (Mehran), Chan, A, & Miri, A. (Ali). (2011). A Lempel-Ziv complexity measure for muscle fatigue estimation. Journal of Electromyography and Kinesiology, 21(2), 236–241. doi:10.1016/j.jelekin.2010.12.003