The time of day that an Olympic swimming race takes place may affect athletes’ performance and could mean the difference between gold, silver and bronze, according to a study published in Scientific Reports. Countries selected to host the Olympics may adjust race times to accommodate broadcast across continents, requiring athletes to compete at different, sometimes…
Chrono@Work will be present at several symposia, classes and congresses in the upcoming period. Please have a look and subscribe if you are interested in the topic. 16th April 20:00h in Leeuwarden: Studium Generale Het Einde van de Zomertijd en Dan? 18th April whole day in Zeist: Medilex symposium on ‘Slaapproblemen en -stoornissen bij mensen met…
As vice president of the Society for Light Treatment and Biological Rhythms, I want to advertise our upcoming congress. The website to register is open. Last year, we organized the 30th meeting in Groningen, the Netherlands, which was a great success with the largest audience ever. Let’s make the next meeting in Chicago a success…
Linda Geddes, journalist in the UK, published an article in the Guardian titled “No more snooze button: a complete guide to waking up feeling fantastic“. “Now the clocks have gone back and the days are getting shorter, it can be hard to get out of bed. But, from dawn simulators to a regular wakeup time,…
In August, the European Union voted to abolish the bi-annual change in clock time. `Whether the continent will be in constant ‘wintertime’ or ‘summertime’ remains to be decided and this imposes a lot of debate in the various countries of the European Union. Chrono@Work is actively involved in international and national discussion. International and Dutch…
Marijke Gordijn from Chrono@Work co-authors a paper, published in Scientific Reports, about how the eye uses natural light information to synchronize the biological clock to the outdoor light, even when clouds are covering the sky. The mammalian circadian system encodes both absolute levels of light intensity and color to phaselock (entrain) its rhythm to the…
Invited by Honeywell and Medilux, Chrono@Work gave a lecture in Muscat (Oman) on ‘human solutions for control rooms’. In between very technical lectures and for a very special, interested audience, we talked about putting the human in the center of attention. What can we do to optimize the 24h environment for people working 24/7 in…
Marijke Gordijn is a co-author of a study featured at Sleep. Study objectives To determine the effect of light exposure on subsequent sleep characteristics under ambulatory field conditions. Methods Twenty healthy participants were fitted with ambulatory PSG and wrist-actigraphs to assess light exposure, rest-activity, sleep quality, timing and architecture. Laboratory salivary dim-light melatonin onset (DLMO)…
Van der Heijden, K.B., Vermeulen M.C.M., Donjacour, C., Gordijn M., Hamburger, H., Meijer, A.M., Van Rijn, K. Chronic sleep reduction predicts academic achievement and study concentration in higher education students. J. Sleep Res. 2017
http://onlinelibrary.wiley.com/doi/10.1111/jsr.12596/abstract
Meesters, A.N.R., Partonen, T., Maukonen M., Männistö, S., Gordijn, M.C.M., Meesters, Y., Is there a relation between vegetarianism and Seasonal Affective Disorder? Neuropsychobiology 74: 202 – 206 (2017).
https://www.karger.com/Article/Abstract/477247
We sleep more than one third of our lives. And that’s for a reason: sleep is important for our everyday functioning. If you sleep badly, you have less energy and you can hardly concentrate. There are many ways to learn to sleep better. The Dutch Brain Foundation and Chrono@Work have asked Grendel Games to develop…
Giménez M.C., Geerdinck L.M., Versteylen M., Leffers P., Meekes G.J., Herremans H., de Ruyter B., Bikker J.W., Kuijpers P.M., Schlangen L.J. Patient room lighting influences on sleep, appraisal and mood in hospitalized people. J Sleep Res. In Press (2016).
Giménez M.C., Beersma D.G.M., Daan S., Van der Pol B.A.E., Kanis M.J., Van Norren D., Gordijn M.C.M. Melatonin and Sleep-Wake rhythms before and after ocular lens replacement in elderly humans. Biology, 5: 1-12 (2016).
Hommes, V., & Giménez, M. C. A revision of existing Karolinska Sleepiness Scale responses to light: A melanopic perspective. Chronobiology International, 32(6), 750–756. (2015).
Van de Werken, M., Giménez, M. C., de Vries, B., Beersma, D. G. M., & Gordijn, M. C. M. Short-wavelength attenuated polychromatic white light during work at night: limited melatonin suppression without substantial decline of alertness. Chronobiology International, 30(7), 843–854. (2013).
