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. 2017 Mar 8;8:129. doi: 10.3389/fphys.2017.00129

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Copyright © 2017 Pavei, Seminati, Cazzola and Minetti.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Upper Panel: ground reaction force in the three planes of motion during one walking stride at 1.39 m s⁻¹ on the instrumented treadmill. Gray line represents the original signal, black line represents the filtered signal. Lower Panel: power spectrum of each ground reaction force before (upper part) and after (lower part) the filtering process.