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Scientists have proposed a method to "translate" the body's internal clock
According to a new American study, exercise can "change the time of the internal clock" of the human body. The direction and magnitude of this "transfer" depend on the time of day allocated for physical education.
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According to a new American study, exercise can "change the time of the internal clock" of the human body. The direction and magnitude of this "transfer" depend on the time of day allocated for physical education. The results of this study, published in the Journal of Physiology, say exercise can counter the effects of jet lag (after air travel), shift work, and other circadian rhythm disturbances, helping people to adapt.
The circadian rhythm is a 24-hour cycle that regulates many physiological processes, including sleep and food intake. They are influenced by many factors, including lighting. Exercise is known to cause displacement of circadian rhythms, but very little has been known about this effect until now.
A new study found that exercising at 7 a.m. or between 1 p.m. and 4 p.m. sets the clock backward, while exercising between 7 and 10 p.m. moves them forward. Exercise between 1 am and 4 am and 10 am has little effect on the body's internal clock. In addition, the study showed that this effect was independent of gender and age.
The authors studied the internal "clock" of 101 participants after exercise for five and a half days.
The body's internal clock was timed by urine samples taken every 90 minutes to measure the time when melatonin (a hormone regulating circadian rhythm) rises in the evening and the peak melatonin levels a few hours later. The participants then walked or jogged on a treadmill at medium intensity for one hour a day for three consecutive days. They did the exercises at any one of eight o'clock in the afternoon and at night, but at the same time, all three days in a row. The time of the internal "clock" was re-evaluated after the third day after the start of the indicated exercises.
However, because the participants in the study were involved in a lot of physical activity, their results may not match the results of the average person. Further research by American scientists will focus on combining exercise with bright lights and melatonin levels. They want to know how this will affect the internal clock and how changes in the duration and intensity of exercise will affect them.