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CAFFEINE DELAYS OUR BIOLOGICAL CLOCK

September 18, 2015 (Usa-UK)
 

Coffee, tea, and other caffeinated drank before bedtime, not only threatens to keep us awake at night, but produces a delay of about half an hour of the normal cycle of the circadian biological clock . This was revealed by a study published in the journal Science Translational Medicine.
Circadian rhythms of a person can be disturbed by various reasons, including the transition to daylight saving time, or a long-haul flight on multiple time zones. The results obtained by Kenneth Wright and colleagues at the University of Colorado - as well as Boulder and John O'Neill at the MRC Laboratory of Molecular Biology in Cambridge - indicate that the shift clock sleep-wake may be caused by simply drinking a cup of coffee.
For this research Wright and colleagues administered to the volunteers of caffeine pills (equivalent to a double espresso) three hours before these people to go to bed as usual and then took samples of saliva every half hour to measure the levels of melatonin. Result: the caffeine pills resulted in these individuals a delay of about 40 minutes of normal nocturnal melatonin peaks. In a second experiment, the researchers exposed the participants themselves to three hours of light (equivalent to that of the midday sun) at bedtime. This light exposure delayed their peak melatonin of about 85 minutes.
"Now we must think of a caffeine intake at the right time," says Wright, "because even if the consumption of caffeine at night is generally not recommended, could instead help people get over the jet lag when traveling west" (Source: The Scientist).

 
18 Settembre 2015
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