Sierra <=> DQEMG Bridge Software at

Welcome to the project page for interaction between the Cadwell Sierra Wave and the DQEMG program. DQEMG (Decomposition based Quantitative Electromyography) is a program developed over several years by Dr. Daniel W. Stashuk, and in recent years in collaboration with Dr. Andrew Hamilton-Wright.

The DQEMG program provides quantitative measures of motor-unit (MUP) trains acquired from voluntary contractions using a needle electrode. Please see the DQEMG Introduction and Overview document for usage and utility of the program. This program is now available for use with the Cadwell Sierra Wave; please contact us at the address below.

Using the new third-party application interface to the Sierra Wave, we (Andrew Hamilton-Wright and Daniel Stashuk) have provided a "bridge" program to allow live buffer acquisition performed in the Sierra Wave to be decomposed using DQEMG.


To provide some idea how data collection using this system works, we have made up some demonstration videos. To view the demonstrations, you will need to have Adobe Flash Player installed.

  1. Demonstration of data acquisition and transfer (1.7Mb - 1024x768 bit resolution - approximately 1 minute)

    This demonstration shows how one can easily use the Sierra Wave EMG buffer acquisition program to gather data for analysis in DQEMG. At the beginning of this demonstration, we have started both the Sierra Wave acquisition program, as well as the "Bridge" program. The Bridge program is the small window at the top-right of the screen, in which the "OK?" and time information is displayed.

    Note that all acquisition may be controlled solely through the foot pedal, allowing hands to be free to manage needle and patient.

  2. DQEMG Decomposition Overview (1.1Mb - 1024x768 bit resolution - approximately 1.5 minutes)

    This demonstration gives an overview of the types of data that are available after decomposition is performed.

  3. Sierra <=> DQEMG Bridge Initialization & Settings (1.8Mb - 1280x800 bit resolution - approximately 2 minutes)

    This is provided to show the steps to start the bridge, as well as the settings used in data acquisition.

Software and Data Sharing

We would like to share this software with other people interested in quantitative electromyography (QEMG). In particular, we would like to share data collected using this protocol with anyone interested in using DQEMG for analysis.

As mentioned above, an Introduction and Overview document for DQEMG is available from this website.

If you are interested in obtaining and using DQEMG and the Sierra <=> DQEMG bridge, please email us at this address:

Note: Please put the word "DQEMG" in the subject line, in order to avoid problems with spam filtering.

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