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Research published in JMIR mHealth and uHealth

provides nearly identical R-R interval data to a medical-grade ECG (Intraclass Correlation Coefficient = 0.995–1.000). buy polar v800

Because the V800 is no longer in production, finding a new unit is difficult. You can typically find it through secondary markets and specialized retailers: Validation study of Polar V800 accelerometer - PMC Research published in JMIR mHealth and uHealth provides

to be one of the most accurate sports watches for distance recording, showing no statistically significant difference from reference distances in diverse environments. buy polar v800

A study in PMC analyzed its validity for quantifying daily physical activity against the ActiGraph accelerometer. Where to Buy

Studies on ResearchGate and PMC demonstrate the V800 is a valid and reliable tool for estimating jump height compared to professional force platforms.