Slow-wave sleep
Medical term · S
Sleep stages 3 and 4; during slow-wave sleep the brain becomes less responsive to external stimuli.
Related terms
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Central (brain) fatigueA lack of concentration or alertness as well as a sense of lethargy and loss of motivation; involves the central nervous system.
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Gamma-aminobutyric acidA chemical messenger in the brain that may help decrease anxiety and promote slow-wave sleep. Often referred to as GABA.
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Slow-twitch fiberOne of two main types of skeletal muscle fibers. Slow-twitch fibers are recruited most heavily for endurance (aerobic) exercises. See also fast-twitch fiber.