Comparison of three mobile devices for measuring R–R intervals and heart rate variability: Polar S810i, Suunto t6 and an ambulatory ECG system

Agreement Between Methods of Measurement with Multiple Observations Per Individual

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Validity of the Polar S810 Heart Rate Monitor to Measure R-R Intervals at Rest

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Endurance training guided individually by daily heart rate variability measurements

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Comparison of the Polar S810i monitor and the ECG for the analysis of heart rate variability in the time and frequency domains

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Quantifying Errors in Spectral Estimates of HRV Due to Beat Replacement and Resampling

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