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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Daylight saving time. Daylight saving time (abbreviated DST), also sometimes erroneously referred to as daylight savings time, is the practice of advancing clocks during summer months so that evening daylight lasts longer, while sacrificing normal sunrise times.