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kwmobile Watch Band Compatible with Polar Vantage M / Grit X - Watch Band Replacement Silicone Strap - Black
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Comparison of three mobile devices for measuring R–R intervals and heart rate variability: Polar S810i, Suunto t6 and an ambulatory ECG system | SpringerLink
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SciELO - Brasil - Comparison of the Polar S810i monitor and the ECG for the analysis of heart rate variability in the time and frequency domains Comparison of the Polar S810i monitor
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