摘要：Becker LK, Silva JR, Santos RAS, Campagnole-Santos MJ. Telemetric Monitoring Of Cardiovascular Parameters After Exercise Training In Normotensive Rats. JEPonline 2010;13(2):31-41. In the present study we have evaluated, through telemetric recordings, the circadian alterations in mean arterial pressure (MAP) and heart rate (HR) and the variability of MAP and HR induced by exercise training (ET) in normotensive rats. Sprague-Dawley (SD) rats were submitted to 20 sessions of swimming, 1 h duration, 5 days a week for 4 weeks. MAP and HR were continuously recorded every 10 min for 24 h by a telemetric implant. In order to evaluate the effect of an entire week of exercise training, data collected on the 3 last days of each week were used for the analyses. ET did not change the circadian rhythm or acrophase of the MAP and HR or the resting values of MAP during the day or during the night. As expected, ET induced a fall in baseline HR while resting bradycardia was only significant during the night period (wakefulness). The resting bradycardia started at the 2nd week of training. Trained animals did not present alteration in the HR variability. However, there was a significant increase in MAP variability during the day (sleep period) of trained rats in comparison to the night values or to the sedentary period. In addition, the motor activity was significantly smaller after ET during the night in comparison to SE. The data suggest that ET differentially interferes with the mechanism of control of arterial pressure during the day (sleep) and night (wakefulness) periods.
