Yes, they do, as for instance exercise physiologist Dr. Evan Matthews from Montclair State University near New York: Matthews uses the Polar E600 chest strap heart rate monitor (Polar T31 type heart rate monitor) to measure heart rate, which is also used for scientific studies: https://scholar.google.com/scholar?hl=de&as_sdt=0%2C5&q=polar+t31+heart+rate+monitor&oq=polar+t31 But we do not know if Dr. Evan Matthews …
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