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tsd250

Biopac Vibromyography Systems and Transducer Packs

Vibromyography; Precision accelerometers and advanced signal analysis algorithms to monitor muscle vibration. The technique allows researchers to study muscle performance and strength balance.
Code
VMG

Biopac Vibromyography Systems and Transducer Packs



Biopac offer MP36R and MP150 based complete systems for muscle monitoring using Vibromyography. These packages include either an MP150 or an MP36R data acquisition and analysis systems, provided with AcqKnowledge 4 software with VMG analysis filters and either two or four TSD250 VMG transducers.

For existing MP36R and MP150 users, Biopac provide VMG transdcuer packs which include TSD250 transducers and AcqKnowledge 4 with a license for their VMG analysis add-on.
 
Full details and ordering information can be found lower-down on this page.

Vibromyography

The system uses precision accelerometers and advanced signal analysis algorithms to monitor muscle vibration. The technique allows researchers to study muscle performance and strength balance.
 
The accelerometers are placed over the muscle belly and held in place* to record the small vibrations that occur when the muscle is activated. AcqKnowledge software uses wavelet packet analysis to extract the vibrational components that correlate with the effort generated by the muscle being studied. AcqKnowledge includes automated VMG analysis filters to simplify the analysis process.
 
VMG provides extremely reproducible results. The single sensor solution and the lack of skin preparation improve the reliability and reproducibility of muscle effort recordings between muscles and across subjects. One major benefit of being able to compare readings between muscles and between subjects is the ability to perform muscle balance assessments.

  • Ability to perform muscle balance assessments
  • Improved reproducibility between muscles and individuals
  • Convenient setup
  • Reduced setup time
  • Improved subject comfort
  • No electrodes
  • No skin preparation

Ordering Information:

Complete Systems (WSW Win) or (WS Mac)

 VMG102WSW (or WS) 2-Channel VMG System with MP150  The VMG102WS is a complete system for muscle monitoring using Vibromyography. It includes an MP150 data acquisition and analysis system with VMG analysis filters and TSD250 VMG transducers.
 VMG36R2WSW (or WS) 2-Channel VMG System with MP36R  The VMG36R2WS / WSW is a complete system for muscle monitoring using Vibromyography. It includes an MP36R data acquisition and analysis system with VMG analysis filters and two TSD250 VMG transducers.
 VMG104WSW (or WS) 4-Channel VMG System with MP150  The VMG104WS is a complete system for muscle monitoring using Vibromyography. It includes an MP150 data acquisition and analysis system with VMG analysis filters and four TSD250 VMG transducers.
 VMG36R4WSW (or WS) 4-Channel VMG System with MP36R  The VMG36R4WSW is a complete system for muscle monitoring using Vibromyography. It includes an MP36R data acquisition and analysis system with VMG analysis filters and four TSD250 VMG transducers.

Transducer & Software Packs -W Win or -M Mac

Use if you already have a compatible BIOPAC data acquisition system

 VMG150PACK-W (or -M) VMG for MP150WSW or WS  This pack includes one TSD250 VMG transducer and AcqKnowledge software for MP150 with a VMG License. VMG software is optimized for the TSD250 and BIOPAC will not support or guarantee the performance of third-party transducers. The pack provides sensitive microelectromechanical (MEMS) accelerometers and advanced signal analysis algorithms to monitor muscle vibration. The technique allows researchers to study muscle performance and strength balance.
 VMG36RPACK-W (or -M) VMG for MP36RWSW or WS  This pack includes one TSD250 VMG transducer and AcqKnowledge software for MP150 with a VMG License. VMG software is optimized for the TSD250 and BIOPAC will not support or guarantee the performance of third-party transducers. The pack provides sensitive microelectromechanical (MEMS) accelerometers and advanced signal analysis algorithms to monitor muscle vibration. The technique allows researchers to study muscle performance and strength balance.

* Transducer can be secured with a variety of attachment methods (not included), such as double-sided adhesive tape, Ace® bandages and Nylatex® wraps (2.5” or 4” width suggested). Do not use excessive pressure in securing the transducers—snug enough not to move is adequate.

Specifications:

The VMG transducer (with Sonostics BPS-II sensor) integrates a low noise accelerometer with low and high pass filtering and pre-amplification. The transducer operates in differential mode in order to achieve superior noise reduction, delivering two channels of vibration data along a three meter cable to a converter unit which both converts the signal to single-ended mode and adapts the VMG signal appropriately for use with the BIOPAC research platforms.

VMG software is optimized for the TSD250 and BIOPAC will not support or guarantee the performance of third-party transducers.

Sensor

    Operational Frequency Range: 20-200 Hz
    Input range: ±2 Volts
    Sensitivity: 50 V/g (MP150), 0.6 V/g (MP36R)
    Noise Floor: 16 mV rms (MP150), 0.8 mV rms (MP36R)
    Temperature range: -55C to +125C
    Maximum Shock: 2000 g
    Voltage output: ±10 V (MP150), ±0.2 V (MP36R)
    Type: Sonostics VMG BPS-II; microelectromechanical (MEMS) accelerometer

Cable

    Length: 3 meters
    Termination: RJ-25 connector (MP150), 9-pin connector (MP36R)

User Guidance

 • Sample acquisition rate must be set to 2,000 Hz for proper operation of the algorithm.

• With a gain of 50 V/g the BPS-II is extremely sensitive to acceleration. To prevent saturation of the signal input when used during movements where impacts, or other high g forces are likely to occur within the pass band of the filters, signal compression technology is incorporated into the transducer. Correspondingly, muscle effort values associated with recording levels approaching the 10 V maximum that the BIOPAC A/D convertor will allow will most likely be inaccurate. Smaller movements or noise (e.g. cavitation sounds emanating from joints will not damage the transducer, and as these transients are typically short-lived (<100 ms) they rarely interfere with data analysis.

• No skin preparation is required.

• For optimal results, place transducer directly against skin surface over the muscle body to be measured.

• Either surface of the transducer can be placed against the skin surface. The convex surface may facilitate use on a concave surface.

• Only a single transducer is required to obtain muscle effort results. • Optimal results are achieved by holding the transducer against the skin with an elastic or athletic wrap using moderate pressure. Double-sided tape is acceptable to prevent movement of the transducer on the skin, though moderate pressure significantly improves recording reliability. The pressure should be sufficient to prevent movement of the transducer. Straps with Velcro attachments are acceptable as long as the Velcro is not detached while signals are being recorded, as noise generated by the detachment could contaminate the VMG signal.

• Excessive pressure, which severely compresses the muscles to be measured, is not recommended and typically results in reduced signal amplitude.

• Avoid dropping transducer onto a hard surface as such impacts can produce accelerations greater than 2000g for more than 0.1ms will destroy the integral sensing unit.

BPS-­-II Specifications v1.1     ©Sonostics, Inc. 2010