TRESGUERRES FISIOLOGIA HUMANA PDF

Either your web browser doesn't support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. Obispado, Monterrey, NL, Mexico. Throughout life, bone tissue undergoes a continuous process of resorption and formation. Melatonin, with its antioxidant properties and its ability to detoxify free radicals, as suggested by Conconi et al. Inhibition of bone resorption may be enhanced by a reaction of indoleamine in osteoclastogenesis.

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Realizace AOW, s. Revised 6 th December Published online 16 th March Full text article pdf SUMMARY We studied the influence of physical activity stress on the circadian rhythms of melatonin and corticosterone in 3-month old male Wistar rats.

Every two hours for 24 h around the clock, an animal from the stressed group was first made to swim for two hours, and was then subjected to a further ten minutes of forced swimming using a modification of the apparatus employed in the Porsolt test.

The capacity to resume swimming after the exhausting 2-hour swim was measured by the number of swimming movements that were made by the animal in the additional min swimming period. Blood was collected immediately after the trial, and the plasma melatonin and corticosterone levels determined by RIA.

Control group blood was collected at 1-h intervals in the periods from to and from to , and at 2-h intervals during the remaining periods. The control rats presented plasma melatonin and corticosterone circadian rhythms with nocturnal and diurnal maxima, respectively. The pattern of these rhythms in the stressed rats was flatter, and the animals tested during hours of the night presented greater endurance than those tested during daytime hours. Physiol Behav , a.

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