Myolab from the Clinical Neurophysiology department University Nijmegen

The research group of Prof. Stegeman has pioneered the 128-channel SEMG method with BioSemi hardware. Please contact the University Nijmegen for prices and availability. The Myolab software consists of three packages:

  Basic acquisition: SEMG acquisition (MyoDaq) and off-line MyoView:
Electrode placement check using On-line cross correlation
Impedance check
Multiple spatial derivations
Open data format, C-language and Matlab routines available
Monopolar recording and storage
Patient and measurement information storage
Electrode matrix definition program (MyoDef)
No time event triggered acquisition
  Basic analysis: Temporal and spatial analysis included in MyoView:
RMS mapping
F10, F50, F90 frequency mapping
Muscle Fiber Conduction velocity
Automated Motor Endplate detection
Batch processing for large data clusters (MyoBatch)
Including upgrade for dedicated acquisition and View (triggering)
Including 1 year free software upgrades
  Advanced analysis : Single Motor Unit (MU) analysis:
MU size
MU topography
MU firing pattern
MFCV distribution
MUNE on basis CMAP topography
Only in combination with the basic analysis package
The MyoDaq user interface is especially designed for surface electromyography (sEMG) measurements using multiple channels on a single muscle. The control in the upper left corner is used to select a part of the 130 channels that are recorded. The largest part of the screen is reserved to display the selected signals. In this example 12 bipolar signals are shown.
The inset shows the impedance measurement and offers a quick overview over the grid. The MyoDaq program includes user definable spatial-filters (montages) and display facilities. The windows-like user interface is easy to operate and focuses on the signals that are recorded.

The user interface offers two display modes: a normal view-mode (see above) and a quality view-mode. The quality view-mode displays the consecutive (bipolar or other montage) signals superimposed. This way it is easy to see if the signals change from one electrode to the other. Furthermore, on the right side of the graph the cross-correlation values are displayed for all superimposed signals. High correlation values >0.7 are required for reliable conduction velocity estimation. Checking the acquired signals during the acquisition is crucial for good signal quality. With this dedicated acquisition program we found it much easier to acquire high quality sEMG. MyoDaq is programmed in C using LabWindows/CVI® version 5.5.
A subject/patient database is created so data can easily be retrieved. The database is a based on a simple text file containing the privacy sensitive information. The privacy sensitive information is not stored inside the data file, so it is save to export the data to colleagues without compromising the subject's privacy. Every new subject receives a unique ID that is used by the system to follow the subject.