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Researchers at the University of California at San Diego and Arizona State University, USA, examined post-exercise body clocks in 101 participants for up to five and a half days.
The circadian "bodily" clock is the 24-hour cycle that regulates many physiological processes, including sleep and diet.
Many factors affect this internal clock, including light and time signals. Exercise is known to cause changes in the circadian clock, but very little is known about this effect.
The study, published in The Journal of Physiology, showed that exercise at 7 am or between 1 and 4 pm was advancing the body clock at an earlier time, and that exercise between 19:00 and 22:00 delayed him.
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Exercises between 1:00 am and 4:00 am and 10:00 am, however, have little effect on the biological clock and the phase-shifting effects of exercise do not differ by age or bad.
"It is known that exercise alters the body clock.We were able to clearly show in this study that exercise delays and advances the time," said Shawn Youngstedt, of the University of Toronto. Arizona State University.
"This is the first study to compare the effects of exercise on the body clock and could open the possibility of using exercise to help counter the negative effects. of jet lag and shift work, "said Youngstedt.
The basic frequency of the biological clock of each participant was determined from urine samples taken every 90 minutes to measure the time of the evening rise of melatonin and the melatonin spike several hours later.
Participants then walked or ran on a treadmill at a moderate intensity one hour a day for three consecutive days.
They exercised at one of eight different times of the day or night, but each individual exercised at the same time the three days or three nights. The timing of the biological clock was reevaluated as a result of the third session of the exercises.
Since the subjects tested were more physically active than the average, the results may not correspond to the average person.
Further research will focus on the combination of bright light exercises and melatonin to determine its impact on body clocks, as well as the effect of changes in exercise time and intensity on the biological clock.
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