Last Updated on July 8, 2022 by pg@petergamma.org
Imali T. Hettiarachchi, Samer Hanoun, Darius Nahavandi, Saeid Nahavandi
Institute for Intelligent Systems Research and Innovation, Deakin University Melbourne,Victoria
https://www.deakin.edu.au/iisri
Protocol:
5 min rest, then 4 to 5.5 km/h walking, then 65 to 80 rmp spin cycle.
Reference ECG device:
ECG was recorded via a 64-channel wireless g.Nautilus active electrode multipurpose biosignal acquisition system (g.tec medical engineering GmbH, Austria).
Results:
“The intraclass correlation between the ECG and Polar OH1, for the aggregated data, was 0.99 and the estimated mean bias ranged 0.27–0.33 bpm for the sensor locations.
The three sensors exhibited a 95% limit of agreement (LoA: forearm 5.22, -4.68 bpm; upper arm 5.15, -4.49; temple 5.22, -4.66). The mean of the ECG HR for the aggregated data was 112.15 ± 24.52 bpm. The intraclass correlation of HR values below and above this mean were 0.98 and 0.99 respectively. The reported mean bias ranged 0.38–0.47 bpm (95% LoA: forearm 6.14, -5.38 bpm; upper arm 6.07, -5.13 bpm; temple 6.09, -5.31 bpm), and 0.15–0.16 bpm (95% LoA: forearm 3.99, -3.69 bpm; upper arm 3.90, -3.58 bpm; temple 4.06, -3.76 bpm) respectively.
During different exercise intensities, the intraclass correlation ranged 0.95–0.99 for the three sensor locations. During the entire protocol, the estimated mean bias was in the range -0.15–0.55 bpm, 0.01–0.53 bpm and -0.37–0.48 bpm, for the forearm, upper arm and temple locations respectively. The corresponding upper limits of 95% LoA were 3.22–7.03 bpm, 3.25–6.82 bpm and 3.18–7.04 bpm while the lower limits of 95% LoA were -6.36–(-2.35) bpm, -6.46–(-2.30) bpm and -7.42–(-2.41) bpm.“
The authors found a 95 % – 99 % agreement between a g.Nautilus ECG device and a Polar OH1
Conclusion
«The findings of the study shows that the Polar OH1 HR is in high agreement to the criterion measure ECG HR under moderate to high intensity physical activities. Therefore, when accurate HR measurements are required, Polar OH1 can be used in place of ECG or chest strap HR monitors during moderate to high intensity physical activities.»
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217288
Comparison to Polar H10:
What is the inaccuracy of a Polar H10 chest strap compared to a research grade high quality ECG device? This has not yet been demonstated convincingly.
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