Key result
Polar H7 chest strap underestimates heart rate variability threshold by ~4 bpm compared to ECG.
Why the study?
The significance of recording artefact, correction methods, and device bias on the non-linear HRV biomarker DFA a1 during exercise and aerobic threshold determination is unclear.
Does artefact correction and recording device type affect the accuracy of the non-linear HRV biomarker DFA a1 for aerobic threshold determination?
Population
17 participants during an incremental treadmill run
Comparison
Different artefact levels and correction methods, and synchronous ECG vs Polar H7 recordings
Authors
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Consumer device bias in DFA a1 thresholds warrants device-specific caution; leaves open prospective validation before routine adoption.
Cross-Sectional (n=17)
No
Does artefact correction and recording device type affect the accuracy of the non-linear HRV biomarker DFA a1 for aerobic threshold determination?
Mean Difference: -4
p-value: p=0.002
Artefact correction methods and consumer chest belt devices introduce measurable but clinically acceptable bias in DFA a1-derived aerobic threshold determination during exercise.
Rogers et al. (2021) conducted a cross-sectional in Healthy volunteers (n=17). Polar H7 chest strap and artefact correction vs. ECG and artefact-free data was evaluated on Heart rate variability threshold (HRVT) bias between Polar H7 and ECG (MD -4 bpm, p=0.002). While artefact correction of up to 6% missed beats kept mean HRVT determination within 1 bpm of artefact-free ECG, using a Polar H7 chest strap resulted in a significant -4 bpm bias compared to ECG.
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