HOME >> MEDICINE >> NEWS
Human circadian clocks couple to local sun time

By assessing the daily activity patterns of thousands of individuals living in different geographical locations, researchers have found evidence that the human circadian clock becomes coupled to so-called local sun time despite the fact that people live and work according to a common "social time" that is determined by time zones. The work also indicated that city dwellers appear to experience a relatively decreased influence of local sun time relative to those living in more sparsely populated areas.

The findings appear in the January 23rd issue of Current Biology and are reported by Till Roenneberg of Ludwig-Maximilians-Universitt, Germany; C. Jairaj Kumar, of Kasturba Medical College, India; and Martha Merrow, of the University of Groningen, in The Netherlands.

Because our watches and clocks are set according to time zones, which are constant over multiple longitudes, rather than according to local sun time, which continuously changes across longitudes, there is often a discrepancy between the natural-light cues one receives as a result of local sun time and the "social" cues one receives as a result of clock time. The extent of such discrepancies depends on the time of year and one's location within a time zone, but can be substantial: In some cities, midnight (according to clock time) can fall well beyond an hour away from "mid-dark." The relative influences of these two types of cues on circadian rhythms are not fully understood by scientists, and in the new work, researchers sought to address this issue by comparing the circadian behaviors of people experiencing these influences to different extents in their daily lives.

The measure used to assess patterns of daily activity is the so-called chronotype, which is determined by answers to questionnaires that assess patterns of habitual activity and rest during work days and free time.

In the present study, the authors compared the chronotypes of over 21,000 individuals liv
'"/>

Contact: Erin Doonan
edoonan@cell.com
617-397-2802
Cell Press
22-Jan-2007


Page: 1 2

Related medicine news :

1. Human stem cell treatment restores motor function in paralyzed rats
2. Human antibodies protect mice from avian flu
3. Global Environmental Change and Human Health: New project launched at GEC Conference in Beijing
4. Human brain region functions like digital computer, says CU-Boulder professor
5. Human rights abuses frequent in Haitis capital
6. Humanitarian response urgently needed to address Lebanese health crisis
7. Human Factors research highlights ways to improve patient safety
8. AstraZeneca, University of Miami, and Humana collaborate to improve consumer health
9. Humans ignore motion and other cues in favor of a fictional stable world
10. Human eggs can develop from ovarian surface cells in vitro
11. Institute of Medicine news: Human resource crisis in HIV/AIDS

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:1/11/2019)... (PRWEB) , ... January 11, 2019 , ... ... with Detroit AM radio station, WJR-760. , Dr. Jonathan Zaidan, President of Women’s ... Thomas airing on the third Wednesday of each month at 7pm. , "We ...
(Date:1/10/2019)... NEW YORK (PRWEB) , ... January 10, 2019 ... ... concert in partnership with the UN Chamber Music Society at the United Nations ... at Mount Sinai, whose mission is to provide complementary services including music, art, ...
(Date:1/10/2019)... Mass. (PRWEB) , ... January 10, 2019 , ... ... announced today that it has partnered with MD101, a regulatory consulting company that ... both have core expertise in servicing companies in the medical device and healthcare ...
(Date:1/10/2019)... (PRWEB) , ... January 10, 2019 , ... ... by introducing their Cellulose Tencel CBD Infused Face Mask. CBD, or Cannabidiol, is ... beneficial properties research has shown that CBD influences receptors that are naturally present ...
(Date:1/8/2019)... ... , ... West 10th Dental in New York, NY is pleased to announce ... Demetrios Sengos, founder of West 10th Dental, "We want our patients to know that ... always keeping up with the latest in technology as dentistry changes, and by making ...
Breaking Medicine News(10 mins):
(Date:1/21/2019)... ... 21, 2019 , ... Nanomedical Diagnostics , the world’s ... Cardea , effective January 21, 2019. , The new name reflects a ... with ultra sensitive biosensor research tools, to opening its breakthrough biosensor platform for ...
(Date:1/20/2019)... ... January 18, 2019 , ... The Icahn School of ... drug pentosan polysulfate sodium for the treatment of mucopolysaccharidosis (MPS), with Australia-based company ... , MPS is a group of 11 lysosomal storage diseases, metabolic disorders caused ...
(Date:1/15/2019)... ... 2019 , ... RMA of Connecticut, a leading fertility practice whose exceptional quality ... event that will demystify fertility age-related issues and will include complimentary fertility testing ... Fertility Age ,” will take place on Thursday, January 24th at 6 PM and ...
Breaking Medicine Technology:
Cached News: