Kinematic and vibration description of running pattern using empirical mode decomposition
X. Chiementin, M. Munera, C. B. Machado, E. Abdi, D. Sá-Caputo, M. Bernardo-Filho, R.Taiar
Abstract: Background: Running is the source of repeated shocks which can reach amplitude over 20g during a foot-ground contact generating stress vibration in humans. This study proposes to apply an advanced signal processing method which is the Empirical Modal Decomposition (EMD) to describe the vibration at the tibia after the impact in running.
Methods: One participant completed 5 tests at 10 and 14 km/h on a treadmill using Rearfoot strike and Forefoot strike techniques. Accelerometric data were collected at a sampling frequency of 1344 Hz. The sports kinematics and vibrations generated by the impact were dissociated by a reconstruction scheme of Intrinsic Mode Functions (IMF). Then, Root Mean Square (RMS) values were computed before and after the EMD.
Results: EMD method allows (i) dissociating three phases generated by the runner kinematics and by the foot/ground shock, (ii) to estimate an RMS value generated to the impact (RearFoot, 14km/h: 6m/s², 10km/h: 4.5m/s²; ForeFoot, 14km/h:11.2m/s², 10km/h: 8.1m/s²). This value depends on the running technique and on the speed.
Conclusion: This study is orientated on the original methodology of the signal treatment. Like perspective we will focus on the assessment between the findings of the current work with the publications of other studies.
Series on Biomechanics, Vol.31, No.4 (2017), 3-11
Methods: One participant completed 5 tests at 10 and 14 km/h on a treadmill using Rearfoot strike and Forefoot strike techniques. Accelerometric data were collected at a sampling frequency of 1344 Hz. The sports kinematics and vibrations generated by the impact were dissociated by a reconstruction scheme of Intrinsic Mode Functions (IMF). Then, Root Mean Square (RMS) values were computed before and after the EMD.
Results: EMD method allows (i) dissociating three phases generated by the runner kinematics and by the foot/ground shock, (ii) to estimate an RMS value generated to the impact (RearFoot, 14km/h: 6m/s², 10km/h: 4.5m/s²; ForeFoot, 14km/h:11.2m/s², 10km/h: 8.1m/s²). This value depends on the running technique and on the speed.
Conclusion: This study is orientated on the original methodology of the signal treatment. Like perspective we will focus on the assessment between the findings of the current work with the publications of other studies.
Series on Biomechanics, Vol.31, No.4 (2017), 3-11
Keywords: biomechanics; Empirical modal decomposition (emd); running; signal treatment; vibratory risk
Date published: 2018-01-10
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