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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]
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]
90-year-old shows off incredible dance moves. Updated May 9, 2019 at 3:31 PM. ... She eventually married Frank in 1963 and was inducted into California Swing Dance Hall of Fame in 1996.
Examples include circannual or annual cycles that govern migration or reproduction cycles in many plants and animals, or the human menstrual cycle. Ultradian rhythms, which are cycles shorter than 24 hours, such as the 90-minute REM cycle, the 4-hour nasal cycle, or the 3-hour cycle of growth hormone production.
If there’s one thing the honorable Elle Woods taught us (besides, of course, the bend and snap) it’s that exercise gives us endorphins and endorphins make us happy. Though not the strongest of ...
Mellors created this “Ride playlist” as the perfect companion to the workout, allowing you to cycle to the correct beats per minute. Cycling workout. 0-1:00: ...
The dance is primarily an act of performing quick and intricate footwork. The rivalry between the Crips and the Bloods spilled over into the world of entertainment, with the adoption of the gang dance by various rappers on the West Coast of the United States, who gave it its name, the Crip Walk.