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Effect of exercise training and various stress on the circadian rhythm of serum corticosteroid


, : Effect of exercise training and various stress on the circadian rhythm of serum corticosteroid. Bulletin of the Physical Fitness Research Institute 0(83): 155-163

Effect of exercise training and various stress on the circadian rhythm of cortisol was investigated in mice. Male C3H/HeN mice were housed at constant temperature and humidity (24+-1 degree C, 55+-5%) and under a constant light-dark cycle (light on at 8:00 and off at 20:00). Control mice were fed ad libitum. We evaluated the modulation of the circadian rhythm of cortisol by food restriction, electrical stimulation and exercise training. In the food restriction experiment, food intake was allowed for 4 hours period each day for 14 consecutive days. The first group was allowed to eat from 5:00 to 9:00 (FR 5) and the second from 17:00 to 21:00 (FR 17). In another experiment, electrical stimulation (ES, 20V 20mA direct current) was given to a group of mice for 30 min per day for 7 consecutive days at 17:00 18:00. In the exercise training experiment, two groups of mice were trained once daily for 14 consecutive days on a treadmill. One group was trained at 9:00 (T 9), and the other at 17:OO (T 17). They ran for 30 min at 20 m/min. Water was available for each experiments ad libitum. The peak value of serum cortisol appeared at 22:00 in the control mice. When feeding was restricted, the peak advanced before the food presentation. The peak appeared at 2:00 in FR 5 and at 14:00 in FR 17. Similar change was observed in the ES experiment and in the training experiment. In each experiment, the peak value of cortisol appeared at the time when stress was given. The peak values in the trained groups were approximately 70% of the control. The basal level of cortisol circadian rhythm was significantly lower in the trained mice as compared to the level of the control, ES and FR groups. We showed that not only food restriction but exercise training and electrical stimulation stress can modulate the circadian rhythm of hypothalamo-pituitary-adrenocortical axis when given at an appropriate time of the day.

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