Аннотация:An approach to diagnosing Parkinson’s disease and essential tremor based on the analysis of histograms of phase differences of the electromyogram envelopes of antagonist muscles was investigated. A comparison of two methods for calculating the instantaneous phase is carried out. The first method is based on the complex ridges of the Morlet complex wavelet spectrograms. The second method is based on the Hilbert transform. Statistically significant differences of medians of the instantaneous phase shift of electromyogram envelopes in antagonist muscles were found.