Feedback is one of the important contributors of motor learning. Feedback is defined as a method of controlling a system by reinserting in to it the result of its past performance. Is A type of extrinsic feedback where feedback is given continuously during performance of a task that in turn improve the patients performance.. This technique help the patient to improve their functional performance through auditory or visual stimuli.
INSTRUMENTATION
The standard biofeedback equipment consist of the following,
Surface Electrode
Signal processor
Video display
Audio speaker
Electrode paste
Surface electrodes are silver or silver chloride electrodes with a diameter of 1 cm or less, they detect biological signals arising from the working muscles. for electrode application bipolar technique is used. The active electrode will be placed over the muscle belly parallel to the muscle fiber, the distance between the electrode usually kept 1 cm to optimize the results ..
STEPTS INVOLVED IN SIGNAL PROCESSING
amplification : improve signal strength
Filtering : eliminate unwanted signals
Rectification : positive and negative signals are made unidirectional
integration :area under curve is computed
level detector : to detect present level of EMG activity
THE OUTPUT UNIT
The output unit includes both audio and video display
USES OF EMG FEEDBACK
Neuromuscular re-educations
Relaxation (Down Training)
Tension recognition training
training to use myoelectric appliences
CONTRAINDICATIONS
Unhealed grafts
Avulsed Tendons
Third degree tears of the muscle fibers
Unstable fractures
Prepared By
Dr.Gayathri Rajeevan
BPT, MPT (Cardiorespiratory)
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