Bradycardia was defined as a heart rate less than 60 beats per minute when textbooks asserted that the normal range for heart rates was 60â100 BPM. The normal range has since been revised in textbooks to 50â90 BPM for a human at total rest.
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Print Email. Comments. Syracuse, N.Y. -- It's almost time to spring your clocks forward: Daylight Saving Time in the United States officially begins at 2 a.m. March 8. Daylight saving time, of course, saves no daylight at all. Perhaps England has the right idea: There, they call it British Summer Time.. (Of course, it starts March 29, which is not exactly summer in the Northern Hemisphere.).