“Numerous studies have demonstrated the stimulant effects of caffeine, but none of these have looked at their effects in terms of the consumer’s gender,” Ana Adan, lead author of the study and a researcher in the Psychiatry and Clinical Psychobiology Department of the UB, tells SINC.
Research into the effects of caffeine tends to be carried out using preparations in which the caffeine level is much higher than normal intake. According to Adan, the novelty of this study lies in “the difference seen in the effects on men and women, based on the quantities of caffeine people take in 99% of cases (espresso coffee and decaffeinated espresso coffee, containing 100mg and 5mg of caffeine, respectively)”.
In order to measure the effects, the scientists used a sample of 668 university students (238 male and 450 female) with an average age of 22 years. Measurements were taken before and after the caffeine was ingested (10, 20 and 30 minutes) and were carried out at mid-day (11am to 1pm) and in the afternoon (4pm to 6pm), to act as a control in case of possible differences caused by the time.
“Although both the men and women saw an improvement in their activity levels with the coffee, which increased in later measurements, we observed a greater impact among the males,” the Catalan researcher tells SINC.
When the decaffeinated version was introduced into the study, the authors also found a small subjective improvement in the participants’ state of alertness, which did not rise so strikingly in the later measurements. “Although we can’t say it is a placebo, we did note an effect resulting from drinking a decaffeinated coffee (at a quantity insufficient to actually affect mood),” adds Adan.
The results showed a small impact among both men and women who drank the decaffeinated coffee, although this time the effect was slightly more noticeable among the women. The effect of decaffeinated drinks on alertness had not been previously studied.
As the author says, “if a person cannot drink normal coffee, a decaffeinated one might provide some benefits. It remains to be evaluated whether these effects are simply subjective, or if they do have an impact on performance”.
Coffee produces fast-acting effects
Caffeine has an almost immediate effect. Previous studies had shown that alertness starts to increase 30-45 minutes after consumption, but the new study shows that the effects begin after as little as 10 minutes. According to the researcher “45 minutes is the time needed for maximum caffeine concentration to be reached in the blood, but levels reach half this concentration after just a few minutes”.
The experts say the effects of caffeine last for between two and three hours, although some authors extend this to up to four or five hours according to an individual’s particular sensitivity and metabolic rate, which varies greatly with age.
SINC Team | alfa
Innovative genetic tests for children with developmental disorders and epilepsy
11.07.2018 | Christian-Albrechts-Universität zu Kiel
Oxygen loss in the coastal Baltic Sea is “unprecedentedly severe”
05.07.2018 | European Geosciences Union
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
16.07.2018 | Physics and Astronomy
16.07.2018 | Life Sciences
16.07.2018 | Earth Sciences