Last Updated on September 17, 2022 by pg@petergamma.org
Results:
«Heart rates continuously monitored by the EQ02+ and H10 systems over the
laboratory visits were in close agreement (Bias ± SD, -0.3 ± 3.7 bpm; 95% LoA, [-7.5,
7.0 bpm]; R2, 0.991). The EQ02+ and H10 systems provided similar measurements of
resting heart rate (Bias ± SD; -0.5 ± 1.6 bpm; 95% LoA, [-2.7, 3.7 bpm]; R2, 0.954) and
maximal heart rate (Bias ± SD; -1.3 ± 3.4 bpm; 95% LoA, [-7.9, 5.3 bpm]; R2, 0.901).»
Conclusion:
«The EQ02+ is an accurate body sensor for continuous HR monitoring of work/rest cycles across the physiological limits of cardiovascular function».
- When we look at the data of the technical report of the US Army Institute, it is difficult to interpret those for someone who is not familiar with the technical details of the technical report.
- There are three plots in the report.
- From these plots we guess that the accuracy differences between the Equivital Lifemonitor and a Polar H10 chest strap is estimated around less than 5 % in the different plots..
- A previous accuracy study with the Equivital Life Monitor showed problems with ECG artifacts, which resulted in an accuracy of down to 43.58 % compared to a Holter ECG monitor:
https://www.frontiersin.org/articles/10.3389/fphys.2016.00391/full
- The present study says the device is accurate in the range it was tested.
- This let us conclude, that the problems with ECG artifacts mentioned in the previous papers are solved, altough this topic is not discussed in the paper of the US Army.
- Adinstruments made us an offer for the Adinstruments Equivtal with LabChart Pro software which was a bit higher than 10 000 USD.
- According to the data of the Army report, the device seems not to be highly accurate. Limits are shown fo 95% accuracy. Most of the data are within these 95% borders.
- Is this a noise and motion artifact free ECG device? We could not find any information about this in the report. It was not discussed in th report.
- From a device with noise and motion artifact free ECG, whe would expect that the accuracy of the device is very close to a Polar H10 chest strap. The data points of the accuracy study of the Equivital in the report is manly within the borders of 95%.
- In the technical report, the device is called Equivital Life monitor, and not Adinstruments Equivital.
- On the website of Equivital, it says that Adinstruments is a new partner of Equivital since 19 July 2016 for worldwide distribution of Equivital LifeMonitor with LabChart software.
- In the technical report, it is not mentioned that Adinstruments LabChart software was used.
- We could not find any information which software was used with the device in the report.
- For EEG devices, there are tools available to remove EEG motion artifacts, and these tools are also available from the manufacturers of EEG devices:
- For ECG and PPG devices, there is the Python Toolbox HeartPy:
https://scholar.google.com/citations?user=OOhuA6gAAAAJ&hl=de&oi=sra
- the g.tec support says about the topic of motion artifact free ECG, that they know of no manufacturer who can manage that, and that g.tec can minimize them. In their particular case, they can use active electrodes.
- Adinstruments advertises the Adinstruments Equivital as a noise and motion artifact free ECG device, and this is also stated in the data sheet of the Adinstruments Equivital.
- We do not know which software is sold by Equivital for the Equivital Lifemonitor, and whether such a software was used in the US Army report.
- Adinstruments sells the Equivital with Adinstruments Labchart Pro software.
- We could find litte information about motion artifact ECG devices from the manufacturers of ECG devices.
- More information about this topic can be found in a paper about the HeartPy toolbox:
https://scholar.google.com/citations?user=OOhuA6gAAAAJ&hl=de&oi=sra
- We did not yet study in detail the literature about motion artifact free ECG devices, which tools can be used, and these affect the accuracy of ECG devices.
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