1. Triple Electrode Cable with Ground - MC-5SGW FOR ECG
Electrode Cable with ground (green) auses standard EMG or ECG Electrodes.
Plugs directly into box Input, or into Y-Connector, or Extension Cable.
This cable is included with the purchase of an Instrument.
SIDEBAR - Dual Electrode Cable -no Ground - MC-5SW NOT FOR ECG
You can also use this two-lead cable [+ and -, but no ground] for ECG in emergencies.
If you do use it, you must also attach the Skin Conductance sensors to a finger. The Green SC sensor is also a system GROUND.
This cable is included with the purchase of an Instrument.
AGAIN : Be sure you have the subject connected to a ground (green) lead on another sensor. Grounds are found on two sensors, the MC-5SGW, and the MC-6S-Y Green Skin Conductance lead. Use either or both.
2. Gel Free Wrist Electrodes - MC-5D FOR ECG
This is our most popular electrode for Heart - Breath Wave detection. If you plan to do a lot of ECG / HR / RSA / HRV work, this option will save time and avoids the need to set up, abrade and tape traditional ECG snap electrodes.
This set up takes just a few seconds: Slip on the wrist-bands, clean the skin, use alcohol to moisten the skin, and slip the gelless dual-electrode pads underneath, one for each wrist. That's it!
Getting a good ECG signal:
Individual physiology may vary and some individuals may have an indistinct R-wave point in their ECG signal. The software needs to be able to detect the R-wave in order to calculate the IBI (Inter-Beat Interval) for HRV displays. If heart rate tracking appears to be unreliable, try a right ankle, left wrist placement with either gel-free or disposable electrodes instead of wrist-to-wrist placement.
Raw ECG is a broadband signal display of electrical activity between the two electrodes, which includes the ECG waveform plus EMG activity at the electrode sites.
The only purpose of the raw ECG signal is to help you evaluate the quality of the ECG signal and the amount of artifact present in the signal. This display is not used for feedback. If you get an unexpected reading on an HRV display, you can use the raw ECG signal to evaluate whether the anomaly is due to EMG artifact, indistinct R-wave, or missing or premature beats.
This display 'pulses' with every beat. Do not mistake it for the tri-colored DFT display for VLF, LF and HF waves [next page] . This pulsing spectral display is not ot intended for feedback,. This display is present on the Check Signals screen of HRV Breathing applications. The main use is to evaluate electrical line frequency artifact, which appears as regular spikes at 50 or 60 Hz. You will see a large spike at 50 or 60 Hz contaminated Raw ECG signal display to the left. Compared to uncontaminated Raw ECG and ECG FFT displays, the spikes are very narrow and large.
The Heart Rate signal is derived beat-by-beat from each R-wave. It is calculated directly from the IBI (Inter-Beat Interval) . HR, then. reflects beats per minute and is recalculated and updated in the display on each beat. No averaging is performed. That is why the graphs are not 'smooth.' Instead they are step-wise, each HR updated for the last bet. This produces adirect heart rate waveform display which is a good graphical representation of HRV (Heart Rate Variability). This signal is used in line graph displays along with the Respiration waveform so that the impact of correct breathing on HRV can be easily observed as (1.) increases in variability in the HR waveform and in (2.) increased synchrony between the HR and Respiration waveforms.
HR is frequently paired with a mechanical Breathing Pacer. The Breathing Pacer screen has a unique way of displaying HR that is step-wise. When a new heartbeat occurs, its value in beats per minute is plotted as a square dot and a line is drawn from each previous beat to each new beat, producing a graphing point display.
Min vs Max HR
This is a display of heart rate variability averaged over 20 seconds. The software measures the minimum and maximum heart rate values for 20 seconds [HRV_20 =], then averages the difference of these values and displays them in a line graph. HRV_20 is a good graphical display of increasing or decreasing HRV trends.
Thre are two ways of using ECG electrodes:
For those interested in HR and HRV, here are the J&J Manuals for PhysioPilot 5
Click here to download pdf manual for HRV and Peripheral Biofeedback
Electrode placement for detecting EKG is an inverted triangular configuration around the chest. The positive electrode is placed near the left clavicle and green ground electrode is on the right clavicle. The negative electrode is placed in the center axis below the sternum. This positions the two active electrodes across the heart's main axis (which is tilted slightly to the left]).
SIDEBAR: Researchers should report that: 'The positive and ground electrodes were placed over the right and left coracoid processes, and the negative electrode over the xiphoid process.'
Some clients perceive exposing their chest as invasive or offensive. Placing the electrodes in an upright triangle on the sternum and both sides of the abdomen is less objectionable (Baker, Peper & Shaffer).
Ask the client to lift their shirt and place the positive electrode below the ribs on the right and the negative electrode at the same level on the left. The ground electrode can go anywhere, but a good location is the upper sternum area.
To use the forearms,the positive electrode is on the right arm and the other two are on the left arm.
Forearm placement is more susceptible to interference from any upper body muscle activity.
Wrist placement can be used with elther gelled and Gel lss electrodes. The wrist band gel less electrode system provides the easiest placement method for EKG signal detection. For best results, J&J includes our built-in IBI detection algorithm. It works for all ECG detection techniques, and is most needed when working with the GelFree Electrode system.
IMPORTANT: The positive lead should be placed on the left wrist and the negative and ground leads on the right wrist. Technically both are placed on the palmer aspect of each wrist.
You must still prepare the skin and the electrodes. Use a wet combination of water-alcohol on both the skin [with a cotton swab] and separately on the electrodes. The place the wet electrodes over the wet skin.
AMPLITUDE : Adjusting the position of the electrodes on the client's chest or arms can help maximize the R-spike's amplitude.
POLARITY: If the R-spike appears to be reversed, you may have reversed the positions of the electrodes. Be sure to place the positive electrode on the right shoulder or arm and the negative electrode over the xyphoid process or the left arm.
Bad HR 1: Always check the ECG Impedance on the first screen. If the Impedance shows BREAK, you need to wet or gel the skin as well as the electrodes. You should do this every time ,anyway, as normal practice.
BAD HR 2: Some people have bigger ECGs that our detectors read as double beats. This is not a medical diagnosis, only a practical problem. If heart rate tracking appears to be unreliable, try a right ankle, left wrist placement