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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 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]
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] There is a circasemidian rhythm in body temperature and cognitive function which is technically ultradian.
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. Tidal rhythms , commonly observed in marine life, which follow the roughly 12.4-hour transition from high to low tide and back.
A typical siesta lasts about 20 to 30 minutes. "This duration is ideal for a quick recharge without falling into a deep sleep, which can cause grogginess," says Petkus.
Scientists found that if all people boosted their activity to 160 minutes daily, they could increase their life expectancy over five years. Experts explain how walking can benefit your health.
Khloé Kardashian's workout includes warm-up stretches before cardio on the Hydrow Wave and strength intervals with her trainer. Her exact routine, here.
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. [citation needed]