Noraxon TeleMyo DTS Manuel technique

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PERFORM Operating Document

TeleMyo Direct Transmission System (DTS)

for Surface Electromyography (EMG)

PC-POD-FA-001-v02

Revision History

Version Reason for Revision Date

01 New POD Jan/16/2015

02 2-year Revision, New Supervisor Dec/16/2016

Summary

The content of this PERFORM Operating Document (POD) provides guidelines for:

-Operation of the TeleMyo DTS hardware

-Skin preparation and electrode placement

-Use of MyoResearch XP Master Edition software

-Use of TeleMyo DTS with VICON Motion Capture

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Table of Contents

SUMMARY---------------------------------------------------------------------- 1

1. DEFINITION OF TERMS AND ABBREVIATIONS ------------------ 3

2. INTRODUCTION -------------------------------------------------------- 4

2.1 TELEMYO DTS SPECIFICATIONS ----------------------------------------------------------------- 5

2.2 EQUIPMENT PHOTOS ----------------------------------------------------------------------------- 6

2.2.1 BELT RECEIVER----------------------------------------------------------------------------------- 6

2.2.2 EMG TRANSMITTER----------------------------------------------------------------------------- 7

3. PROCEDURE --------------------------------------------------------------- 7

3.1 TRAINING ------------------------------------------------------------------------------------------ 8

3.2 OPERATION---------------------------------------------------------------------------------------- 8

3.3 SKIN PREPARATION ------------------------------------------------------------------------------- 9

3.3.1 REMOVAL OF HAIR ------------------------------------------------------------------------------ 9

3.3.2 CLEANING OF SKIN ----------------------------------------------------------------------------- 9

3.4 SECURING THE CABLES --------------------------------------------------------------------------10

3.5 EMG SIGNAL VALIDITY---------------------------------------------------------------------------10

4. EMG PLACEMENTS ------------------------------------------------------12

4.1 FRONTAL MUSCLE MAP: -------------------------------------------------------------------------12

4.2 DORSAL MUSCLE MAP: --------------------------------------------------------------------------12

5. DATA ACQUISITION ---------------------------------------------------14

5.1 VICON NEXUS ------------------------------------------------------------------------------------14

5.2 XP MASTER EDITION ----------------------------------------------------------------------------15

5.2.1MAIN SCREEN ELEMENTS -----------------------------------------------------------------------15

5.2.2 MEASUREMENT SETUP SCREEN ELEMENTS----------------------------------------------------15

5.2.3 DATA PROCESSING ----------------------------------------------------------------------------17

5.2.4 AVAILABLE OPERATIONS ----------------------------------------------------------------------18

APPENDIX I:POD TRAINING RECORD FORM

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1. Definition of Terms and Abbreviations

Ant. Anterior

Abd. Abdominis

I. Inferior

M. Middle

S. Superior

.csv Comma-Separated Values file type

.txt Text file type

DSSS Direct-Sequence Spread Spectrum

DTS Direct Transmission System

ECG Electrocardiography

EMG Electromyography

sEMG Surface EMG

MVC Maximum Voluntary Contraction

MRXP MyoResearch XP Master Edition

SENIAM Surface ElectroMyoGraphy for the Non-Invasive Assessment

of Muscles

RMS Root Mean Square

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2. Introduction

The TeleMyo™ Direct Transmission System (DTS) for surface electromyography

(EMG) directly transmits data from the electrode or sensor site to the receiver. This

direct transmission concept greatly simplifies the arrangement of EMG measurements by

eliminating the need to arrange cable connections between the EMG electrodes and EMG

amplifier. The small, light-weight probes are also beneficial for small subjects like children

and older adults. The Belt Receiver can operate in 3 modes:

1. Direct connection to any PC via USB connection (transmission range 10m)

2. Wireless retransmission of signals in real time to any Noraxon USB receiver

(transmission range up to 100m)

3. Data logging via Flash Memory card

These features give you flexibility to operate the DTS system without physical

limitations. The compatibility to Noraxon’s USB receiver systems, operated via WiFi

based retransmission of data, allows you to integrate up to 8 additional stationary analog

input signals and optional analog output of all signals (i.e. connect signals to the VICON

motion capture system).

The current DTS system operates up to 16 channels, and is equipped with EMG

preamplifiers, but can be integrated with other biomechanical sensors like goniometers,

foot switches, etc.

As a user, you must first decide if you will be using the EMG system on its own, or

in conjunction with other equipment. The system is synchronized with the Vicon motion

capture system, but can be synchronized with other Functional Assessment (FA) devices.

This document will explain the setup of the TeleMyo DTS EMG system on its own,

and the setup for the system in conjunction with the Vicon system.

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2.1 TeleMyo DTS Specifications

Power Requirements

• Replaceable Li-ion rechargeable battery, operation time more than 8 hours after fully

charged

Belt Receiver Output & Transmission Frequency (Depending on country)

• Up to 100 mW (depending on antenna and country allowance)

• WiFi DSSS 2412-2464 MHz on (up to) 11 selectable radio channels

• Belt Receiver Re-Transmission range: up to 100 meters in line-of-sight recordings

DTS Probe Output & Transmission Frequency

• Transmission range: 10m

• Output power: 4mW

• DSSS 2400-2472 MHz on 5 selectable radio channels

EMG Sensor Data Acquisition System

• 16-bit resolution

• Sample rates 1,500 (for 16-channels)

• Selectable low pass filter 500, 1000, 1500 Hz

EMG Sensor Preamplifiers

• No notch (50/60 Hz) filters are used

• 1st order high-pass filters set to 10 Hz +/-10% cutoff

• Baseline noise < 1 uV RMS

• Input impedance > 100 Mohm

• CMR > 100 dB

• Input range +/- 3.5 mV

• Base gain 400

• Snap-style or Pinch-style terminal electrode connections

• Rechargeable Lithium Polymer battery

Dimensions

• EMG Probes Dimensions: 1.34" L x 0.95" W x 0.55" H (3.4 cm x 2.4 cm x 1.4 cm)

• EMG Probes: Weight: Less than 14 g.

• DTS Belt Receiver Dimensions: 12.6 cm L x 6.75 cm W x 2.38 cm H

• DTS Belt Receiver Weight: Less than 185 g.

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2.2 Equipment Photos

2.2.1 Belt Receiver

Front Side

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2.2.2 EMG Transmitter

Front

Top/Back

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3. Procedure

Whether the device will be used with the Noraxon data collection package or with

the Vicon system, the basic principles regarding the use of the device are the same.

Outlined in this section are instruction on operating the EMG probes, electrode

recommendations and an overview of principles regarding EMG.

3.1 Training

All users must read and sign this POD to receive the proper training in

applications and instrumentation. Users should never modify the equipment.

3.2 Operation

The EMG sensors require minimal attention on the part of the user. Because there

are multiple DTS EMG Transmitters, each transmitter has a unique 4 character serial

number consisting of a mix of digits 0-9 and letters A through F, which provides a

simplified means of identifying one sensor from another. This serial number appears on

each DTS EMG Transmitter (adjacent to its charging contacts).

The sensor’s green STATUS indicator provides a means of communicating its

operational state. In the idle state the STATUS indicator will flash at a low, once per

second rate. When the sensor is actively measuring an EMG signal the STATUS indicator

will flash recognizably faster. If the STATUS indicator is not flashing at all, the EMG

Transmitter must be placed in the Charging Dock to be recharged. This could be due to a

depleted sensor battery or if the sensor has been deliberately placed in a special shut

down mode. The Charge LED on an EMG Transmitter is solid orange when charging in

the Charging Dock. The solid orange LED of an EMG Transmitter will turn off when it is

fully charged.

For proper operation, the EMG Transmitter must be applied to the measurement

site so that the reference electrode pad on the bottom side is in direct contact with bare

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skin. Skin preparation for the reference pad site may be beneficial if the EMG signal

exhibits a wandering baseline. The EMG Transmitter can be secured in place using

Noraxon supplied double sided adhesive tape and/or elastic straps. Straps are

recommended if very dynamic movements are expected.

The EMG Transmitter allows for interchangeable terminal lead wires for

attachment to disposable electrodes. The two lead wires are offset with one longer than

the other by an amount equal to the standard 2 cm spacing for surface EMG electrodes.

The 2-pin lead wire connector can be inserted either way into the EMG Transmitter to

facilitate attachment to the surface electrodes. There are 2 lead lengths currently available:

10 cm and 15 cm leads.

3.3 Skin Preparation

In order to ensure proper signal transmission, the surface of the skin under the

electrode and under the transmitter must be cleaned and cleared of anything. This will

ensure proper contact and signal transmission.

3.3.1 Removal of hair

If the participant has hair where the electrodes will be placed, this must be shaved

without the use of shaving cream, which leaves a film and impedes electrode adhesion and

electrical conduction.

3.3.2 Cleaning of skin

The skin under the electrode must also be cleaned. This can be done using a

special abrasive conductive cleaning paste, but the use of an alcohol and a gauze pad is

sufficient. The skin must be cleaned and abraded enough to remove a layer of skin.

Surface Electrode Placement

Once the site has been properly prepared, the electrode and transmitter

can be placed. Here are a few guidelines for electrode placements:

1. Wet-gel electrodes have the best skin impedance values

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2. Use small electrodes to increase the selectivity of your measures (avoid cross-talk)

3. The recommendation for the inter-electrode distance is 2 cm

4. Apply electrodes in series to the muscle fiber direction

5. Use the dominant middle portion of the muscle belly for best selectivity

6. Take care that the electrode site remains on the active muscle mass during muscle

shortening (i.e. biceps brachii)

7. Use a map system with measured distances between the electrode site and dominant

anatomical landmarks (Fig. 4.1 and 4.2)

8. Ensure participant does not sit on or apply too much pressure to the electrode or

transmitter

Knowledge of muscle origin and insertion is also important. For the standardized

electrode placement of the most common muscles recorded using sEMG, visit the

SENIAM Project (http://www.seniam.org/). Click the header ‘Recommendations’ ->

‘Sensor Locations’ and follow the links for each of the regions of the body and the muscles

that comprise them.

3.4 Securing the Cables

Finally, securing the electrodes and preamplifiers on the skin is sometimes

necessary. This point may be not as important for static or slow motion tests, but in

dynamic studies it helps to avoid cable movement artifacts and minimizes the risk of

separating the electrodes from the skin. Use regular tape, elastic straps or net bandages to

secure each electrode lead, however, avoid too much tension. It is recommended not to

directly tape over the electrodes to keep a constant application pressure for all electrodes

and thus reduce unwanted noise in recorded signals.

3.5 EMG signal validity

This checkpoint addresses the basic questions: “Did I measure the right muscle”

and “can I see valid signals at all?” There is a possibility of accidentally applying the wrong

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