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A circadian rhythm, or circadian cycle, is a natural oscillation that repeats roughly every 24 hours. Circadian rhythms can refer to any process that originates within an organism and responds to the environment. Circadian rhythms are regulated by a circadian clock whose primary function is to rhythmically co-ordinate biological processes so they occur at the correct time to maximize the fitness of an individual. Circadian rhythms have been widely observed in animals, plants, fungi and cyanobacteria and there is evidence that they evolved independently in each of these kingdoms of life.
Chronobiology is a field of biology that examines timing processes, including periodic (cyclic) phenomena in living organisms, such as their adaptation to solar- and lunar-related rhythms. These cycles are known as biological rhythms. Chronobiology comes from the ancient Greek χρόνος, and biology, which pertains to the study, or science, of life. The related terms chronomics and chronome have been used in some cases to describe either the molecular mechanisms involved in chronobiological phenomena or the more quantitative aspects of chronobiology, particularly where comparison of cycles between organisms is required.
Flying Cloud was a clipper ship that set the world's sailing record for the fastest passage between New York and San Francisco, 89 days 8 hours. The ship held this record for over 130 years, from 1854 to 1989.
Peggy Annette Whitson is an American biochemistry researcher, and astronaut working for Axiom Space. She retired from NASA in 2018, after serving as Chief Astronaut. Over all her missions, Whitson has a total of 665 days in space, more than any other American or woman.
Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasicsleep refers to two periods, while polyphasic usually means more than two. Segmented sleep and divided sleep may refer to polyphasic or biphasic sleep, but may also refer to interrupted sleep, where the sleep has one or several shorter periods of wakefulness, as was the norm for night sleep in pre-industrial societies.
A zeitgeber is any external or environmental cue that entrains or synchronizes an organism's biological rhythms, usually naturally occurring and serving to entrain to the Earth's 24-hour light/dark and 12-month cycles.
The MARS-500 mission was a psychosocial isolation experiment conducted between 2007 and 2011 by Russia, the European Space Agency, and China, in preparation for an unspecified future crewed spaceflight to the planet Mars. The experiment's facility was located at the Russian Academy of Sciences' Institute of Biomedical Problems (IBMP) in Moscow, Russia.
Hours of service (HOS) regulations are issued by the Federal Motor Carrier Safety Administration (FMCSA) and govern the working hours of anyone operating a commercial motor vehicle (CMV) in the United States. These regulations apply to truck drivers, commercial and intercity bus drivers, and school bus drivers who operate CMVs. These rules limit the number of daily and weekly hours spent driving and working, and regulate the minimum amount of time drivers must spend resting between driving shifts. For intrastate commerce, the respective state's regulations apply.
Maurizio Montalbini was an Italian sociologist and caver who had lived in complete isolation in an underground chamber multiple times since 1986.
Jürgen Walther Ludwig Aschoff was a German physician, biologist and behavioral physiologist. Together with Erwin Bünning and Colin Pittendrigh, he is considered to be a co-founder of the field of chronobiology.
A circadian advantage is an advantage gained when an organism's biological cycles are in tune with its surroundings. It is not a well studied phenomenon, but it is known to occur in certain types of cyanobacteria, whose endogenous cycles, or circadian rhythm, "resonates" or aligns with their environment. It is known to occur in plants also, suggesting that any organism which is able to attune its natural growth cycles with its environment will have a competitive advantage over those that do not. Circadian advantage may also refer to sporting teams gaining an advantage by acclimatizing to the time zone where a match is played.
Kathleen Hallisey "Kate" Rubins is an American microbiologist and NASA astronaut. She became the 60th woman to fly in space when she launched on a Russian Soyuz spacecraft to the International Space Station (ISS) on July 7, 2016. She returned to Earth in Kazakhstan on October 30, 2016, aboard a Soyuz. She was a crew member of Expedition 48/49 and Expedition 63/64 of the ISS. Rubins has spent a total of 300 days, 1 hour, and 31 minutes in space which is the fourth most days in space by a U.S female astronaut.
The Frasassi Caves are a karst cave system in the municipality of Genga, Italy, in the province of Ancona, Marche. They are among the most famous show caves in Italy.
Michel Augustin Francis Siffre was a French underground explorer, adventurer and scientist.
Jessica Ulrika Meir is an American NASA astronaut, marine biologist, and physiologist. She was previously an assistant professor of anesthesia at Harvard Medical School, Massachusetts General Hospital, Boston, following postdoctoral research in comparative physiology at the University of British Columbia. She has studied the diving physiology and behavior of emperor penguins in Antarctica, and the physiology of bar-headed geese, which are able to migrate over the Himalayas. In September 2002, Meir served as an aquanaut on the NASA Extreme Environment Mission Operations 4 crew. In 2013, she was selected by NASA to Astronaut Group 21. In 2016, Meir participated in ESA CAVES, a training course in which international astronauts train in a space-analogue cave environment. Meir launched on September 25, 2019, to the ISS onboard Soyuz MS-15, where she served as a flight Engineer during Expedition 61 and 62. On October 18, 2019, Meir and Christina Koch were the first women to participate in an all-female spacewalk.
Stefania [in all languages except for Polish pronounced like Ste-pha-nee-ah] is a female name in Belarusian, Bulgarian, Croatian, Czech, Greek, Stefánia Hungarian, Italian, Romanian, Polish, Serbian, Macedonian, Slovak, Slovene, Ukrainian and Russian, originating from Old Greek meaning crowned or the winning.
CAVES, an acronym for Cooperative Adventure for Valuing and Exercising human behaviour and performance Skills, is a European Space Agency astronaut training course in which international astronauts train in a space-analogue cave environment. Designed at the European Astronaut Centre, the course aims to prepare astronauts for safe and efficient long duration spaceflight operations by means of a realistic scientific and exploration mission within a multicultural, ISS-representative team.
The bunker experiment was a scientific experiment that began in 1966 to test whether humans, like other species, have an intrinsic circadian clock. It was started by Jürgen Aschoff and Rütger Wever of the Max Planck Institute for Behavioral Physiology and later taken over by Jürgen Zulley. Participants lived in a bunker for multiple weeks while scientists measured their daily rhythms in many variables. The main conclusion of the experiment was that humans have an intrinsic clock with a period greater than 24 hours. The experiment also established many features of this clock and paved the way for future circadian studies.
The food-entrainable oscillator (FEO) is a circadian clock that can be entrained by varying the time of food presentation. It was discovered when a rhythm was found in rat activity. This was called food anticipatory activity (FAA), and this is when the wheel-running activity of mice decreases after feeding, and then rapidly increases in the hours leading up to feeding. FAA appears to be present in non-mammals (pigeons/fish), but research heavily focuses on its presence in mammals. This rhythmic activity does not require the suprachiasmatic nucleus (SCN), the central circadian oscillator in mammals, implying the existence of an oscillator, the FEO, outside of the SCN, but the mechanism and location of the FEO is not yet known. There is ongoing research to investigate if the FEO is the only non-light entrainable oscillator in the body.
Beatriz Flamini is a Spanish extreme athlete and mountaineer known for her acts of self-isolation and self-sufficiency. She is best known for her "Timecave" expedition, whereby she spent 500 days living in a cave in Granada, from November 2021 to April 2023.
References
- 1 2 3 4 "After 130 Days of Cave Life, A Return to Glare of the Sun". The New York Times . May 24, 1989.
- 1 2 3 4 Weingartem, Paul (May 24, 1989). "No Light, Voices For 131 Days, But The Mice Were Friendly". Chicago Tribune .
- 1 2 Toufexis, Anastasia (June 24, 2001). "The Times of Your Life". Time . Archived from the original on June 16, 2013.
- 1 2 3 4 Allen, Caroline (June 7, 1989). "AFTER 130 DAYS IN A CAVE, ITALIAN WOMAN SAYS SHE'D RETURN". Associated Press .
- 1 2 3 4 Arnold, Nick (2009). Horrible Science: The Terrible Truth About Time. Scholastic. p. 28.
- ↑ "No Outside Link : Time Flies for Isolation Researcher". The Los Angeles Times . May 16, 1989.
- 1 2 3 "Woman Emerges After 130 Days Alone In A Cave". Philly.com . May 24, 1989. Archived from the original on December 30, 2014.
- ↑ "Isolation Researcher Loses Track of Time in Cave". The New York Times. May 17, 1989.
- 1 2 Allis, Tim; Haederle, Michael (June 12, 1989). "Ace in the Hole Stefania Follini Never Caved in". People .
- ↑ "Cave woman ending her isolation". Daily News . May 23, 1989. p. 7.