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How Wearables Measure HRV Most consumer devices estimate HRV from the tiny timing differences between heartbeats, usually reported as RMSSD (root mean square of successive differences) in milliseconds
Absolutely and it's often a great idea
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Architectural Forum magazine (November 1952) praised the terminal design as providing "the best circulation pattern of any large US airport...It is surprisingly close to the theoretical best described by CAA." A new West Concourse (now Concourse B) was opened in May 1954 complete with a rooftop observation deck, while the two-level main terminal was opened in April 1956, followed by the North Concourse (now Concourse A) in October 1957
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