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The basic rest–activity cycle (BRAC) is a physiological arousal mechanism in humans proposed by Nathaniel Kleitman, [1] hypothesized to occur during both sleep and wakefulness. Empirically, it is an ultradian rhythm of approximately 90 minutes (80–120 minutes [ 2 ] ) characterized by different levels of excitement and rest.
The Oxford English Dictionary's definition of Ultradian specifies that it refers to cycles with a period shorter than a day but longer than an hour. [1] The descriptive term ultradian is used in sleep research in reference to the 90–120 minute cycling of the sleep stages during human sleep. [2]
1) Walking. As people get older, it can get harder to do some types of exercise — but some centenarians can keep walking. Louise Jean Signore, New York's second oldest person at 112, stopped ...
A 20-Minute Power Walking Workout To Try. Any aerobic exercise, power walking included, should start with a warm-up to slowly transition your heart into exercise mode, says Richardson. With power ...
According to a recent meta-analysis in the British Journal of Sports Medicine, brisk walking—and other moderate-intensity exercises—can greatly benefit longevity. Including a total of over 30 ...
The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1]