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Rhythm Co., Ltd. (リズム株式会社, Rizumu Kabushiki-gaisha) (TYO: 7769), formerly Rhythm Watch until 2020) is a Japanese global corporate group based in Saitama, Japan. The company was founded in 1950 as a clock company and has since expanded globally as a manufacturer of watches, clocks, precision equipment, connectors and small displays.
The external stimulus used to entrain a rhythm is called the zeitgeber, or "time giver". Travel across time zones illustrates the ability of the human biological clock to adjust to the local time; a person will usually experience jet lag before entrainment of their circadian clock has brought it into sync with local time.
A circadian clock, or circadian oscillator, also known as one’s internal alarm clock is a biochemical oscillator that cycles with a stable phase and is synchronized with solar time. Such a clock's in vivo period is necessarily almost exactly 24 hours (the earth's current solar day). In most living organisms, internally synchronized circadian ...
The bunker experiment was a scientific experiment that began in 1966 to test whether humans, like other species, have an intrinsic circadian clock. [1] It was started by Jürgen Aschoff and Rütger Wever of the Max Planck Institute for Behavioral Physiology and later taken over by Jürgen Zulley.
Of the several possible cues (known as zeitgebers, German for 'time-givers') that can contribute to entrainment of the circadian clock, light has the greatest impact. [2] [3] Units of circadian time (CT) are used to describe entrainment to refer to the relationship between the rhythm and the light signal/pulse. [4]
Humans therefore adjust from 24.9 hr internal rhythm to the 24-hour day. There are many different zeitgebers, and their relative influence on an individual at any given time depends on a number of factors, time of day the zeitgeber is presented and the intensity of that zeitgeber.