Whole Body Vibration training is more andmore utilized in sport medicine to enhance athletic performanceand training; recently, vibration treatment is being alsoused for therapy and rehabilitation for patients affected bydifferent pathologies. It is also worth mention that excessivevibrations can be hazardous. The treatment is based on thehypothesis that under some circumstances vibration loadsinduce specific responses from the neuromuscular system;some clinical evidences suggest mechanical and metabolicreaction. Usually, vibrations are transmitted by means of aplatform oscillating at different frequencies (10-80Hz) to patientbody; mainly, limb muscles are involved. Many studiesabout the subject employ surface EMG recordings to evaluatemuscle activity during vibration training. On electrodes, thiscondition generates large motion artifact at the vibration frequency.To get rid of such artifact an adaptive filter was designed:accelerometers placed onto platform or directly onmuscles provide an error signal shape to be cancelled from theraw EMG. In particular, surface EMG have been recordedfrom leg quadriceps muscles of volunteers during whole bodyvibration therapy sessions at different oscillating frequency. Astandard RLS adaptive filter have been used to cancel themotion artifact from EMG in real-time. Results show the effectivecancellations of the vibration frequency from the rawEMG; the RMS value of the cleaned EMG results lower thanthat unprocessed in some cases up to 50%.
Acceleration driven adaptive filter to remove motion artifact from EMG recordings in Whole Body Vibration
M. Romano;
2007-01-01
Abstract
Whole Body Vibration training is more andmore utilized in sport medicine to enhance athletic performanceand training; recently, vibration treatment is being alsoused for therapy and rehabilitation for patients affected bydifferent pathologies. It is also worth mention that excessivevibrations can be hazardous. The treatment is based on thehypothesis that under some circumstances vibration loadsinduce specific responses from the neuromuscular system;some clinical evidences suggest mechanical and metabolicreaction. Usually, vibrations are transmitted by means of aplatform oscillating at different frequencies (10-80Hz) to patientbody; mainly, limb muscles are involved. Many studiesabout the subject employ surface EMG recordings to evaluatemuscle activity during vibration training. On electrodes, thiscondition generates large motion artifact at the vibration frequency.To get rid of such artifact an adaptive filter was designed:accelerometers placed onto platform or directly onmuscles provide an error signal shape to be cancelled from theraw EMG. In particular, surface EMG have been recordedfrom leg quadriceps muscles of volunteers during whole bodyvibration therapy sessions at different oscillating frequency. Astandard RLS adaptive filter have been used to cancel themotion artifact from EMG in real-time. Results show the effectivecancellations of the vibration frequency from the rawEMG; the RMS value of the cleaned EMG results lower thanthat unprocessed in some cases up to 50%.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
