[ad_1]
The circadian clock is the 24-hour cycle that governs many physiological processes, including sleep and diet. Many factors affect this internal clock, including light and time signals. According to a study published online this month in the newspaper Journal of PhysiologyExercise can shift the circadian clock, the orientation and amount of this effect depending on the time of day or night at which people exercise.
Exercise causes circadian phase shift effects.
"Exercise has been known to alter our biological clock," said Dr. Shawn Youngstedt, lead author of the study, a researcher at the University of Arizona State University.
"We were able to clearly show in this study when exercise delays the body clock and when it advances."
Dr. Youngstedt and his colleague from the University of California at San Diego found that physical exercise took place at 7 am or between 1 pm and 4 pm. advanced the biological clock to an earlier time and exercised from 7 pm to 10 pm. delayed the biological clock at a later time.
Exercises between 1:00 and 4:00 and 10:00, however, have little effect on the biological clock and the phase-shifting effects of exercise do not differ according to age or bad.
Scientists examined body clocks after exercise in 101 participants for a period of up to 5.5 days.
The reference 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 melatonin peak 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.
"This is the first study to compare the effects of exercise on the biological clock and could offer the opportunity to use exercise to help counteract the negative effects of jet lag and shift work," said Dr. Youngstedt.
"Further research will focus on the combination of exercise with bright lights and melatonin to determine its impact on body clocks, as well as the effect of changes in duration and duration." Intensity of exercise on the biological clock. "
_____
Shawn D. Youngstedt et al. Human circadian phase reaction curves for exercise. Journal of Physiology, published online 19 February 2019; doi: 10.1113 / JP276943
Source link
