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Sedentary work strengthens mental abilities

14.07.2020

People who have worked in a sedentary job all their lives are at a lower risk of cognitive impairment in old age. This conclusion was made by scientists from the University of Cambridge.

Experts analyzed the lifestyle of 8500 people aged 40 to 79 years. All of them had a different education and a wide circle of friends. Participants filled out questionnaires about their health, lifestyle and hobbies. Volunteers were examined, scientists studied their physical activity at work and after it.

The experiment was long-term - after 12 years, the researchers again studied the condition of the participants and did a series of tests to understand how their cognitive abilities had changed: memory, attentiveness, reading speed and information processing.

People who worked in the office throughout the study period showed the best test results - there were 10%. Those who were engaged only in manual labor worsened their performance by almost three times.

Scientists note that despite the results of the study, physical activity is important for health. A sedentary lifestyle will only keep your cognitive abilities in old age if it doesn't kill you sooner.

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A generator has been created that can draw energy to power nanodevices from the external environment. The work of Professor Zhong Linwang of the Georgia Tech University to create electricity generators based on zinc dioxide nanorods has led to another success: the new generators were able to provide power to sensors for the acidity of the solution and ultraviolet radiation.

Zinc dioxide is a piezoelectric, its crystals are capable of generating electricity when deformed. According to an improved technique, a brush of such crystals is chemically grown on a gold-coated substrate. Then it is filled with methyl methacrylate and the upper part is bled off with plasma. As a result, the generator is protected from the environment, and all bristles are of equal length. On top of the resulting plate is attached a layer of silicon with a platinum coating.

Such a generator of 20 bristles at a strain oscillation amplitude of 2% per second gives a potential difference of 1,2 V. A generator of 700 horizontally arranged zinc dioxide fibers created in a similar way gave a peak potential difference of 1,26 V with a strain of only 0,19%. One cubic centimeter generator of three layers of zinc dioxide brushes provides 2,7 mW of power.

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The source of deformation for the generator can be tides, and sound waves, and mechanical vibrations like the flutter of a flag in the wind, and the pressure of the foot on the sole of the boot, and the movement of clothing elements.

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