This very popular processing method multiplies all amplitude values in a signal with +1, with the effect that all negative values become positive; all amplitudes below the zero line become positive amplitudes.
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Description
EMG Lab- Processing and analysis of
EMG data
Instructions for use of Noraxon System
Using
Noraxon MR Software
·
Start the program
·
Go to Database and open up the Treadmill Gait demo file
·
Click on the Belt Receiver Tab to view the EMG data
·
Focus on the LT Medial Gastroc and do the following
processing.
EMG
Processing
Rectification
This very popular processing method multiplies all amplitude
values in a signal with +1, with the effect that all negative values become
positive; all amplitudes below the zero line become positive amplitudes. The
purpose of this operation is to achieve positive amplitude curves that allow
you to calculate parameters like mean amplitude, area under the curve, etc.
-
Run a full
wave rectification of the channel
Smoothing
Typically, for amplitude based calculations and analysis, the raw
EMG is smoothed by digital filters, root mean squares or moving average
algorithms. The effect is that non-reproducible EMG spikes are eliminated and
the mean trend of the EMG innervation is used.
The following smoothing Algorithms are supported:
• RMS - Root Mean
Square
• Mean - the
moving average
• Mean absolute - the
moving average with combined rectification
Window: allows you to define the millisecond-based
window for each algorithm.
Markers
Markers will be used by the
software to define the periods for analysis.
You can either do this by hand or through automation. Make sure you define your periods before you
run the reports.
Reports
See the manual for information on
reports but the Standard Amplitude Analysis under Myomuscle master should be
sufficient.
