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Level Of Force Effect On The EMG Power Spectrum: A Reliability Study

In order to be considered a potential tool for muscle characterization, EMG power spectral analysis should be proven to be reliable. In this study, the mean power frequency (MPF) and the median (MF! frequency of power spectra (Triceps brachii (TB) , Anconeus (AN) ) obtained at different force levels from both ramp and stepwise contractions were computed for three different sessions (N=9S). Two-way ANOVAs for repeated measures did not depict any significant difference (p>O.O5) in the values of both MF and MPF across sessions for a given level of force for either type of contraction. In contrast, significant changes in MF and MPF across the levels of force, for a given session were found. It thus appears that the MPF and MF of the EMG power spectrum, for a given force level, are reliable between different sessions.