摘要：Nunes RB, Heck TG, Alves JP, Dal Lago P. Hemodynamic Responses during an Incremental Swimming Exercise Test in Rats. JEPonline 2015;18(3):55-62. The aim of this study was to test the cardiovascular responses during an incremental swimming test. Rats were submitted to 25 min of incremental swimming exercise test in individual tanks filled 45 cm with water at 30°C. At the end of each stage (5 min duration each), ~25 μL of blood were obtained from the caudal vein to evaluate lactate concentration and a load increment was added to the tail (0, 2, 4, 6, and 8% of body wt). Simultaneously with exercise, hemodynamic data were recorded by a catheter filled with saline implanted (24 hrs before) into the carotid artery for direct arterial pressure measurements. Our data show that sedentary rats are able to keep a stable blood lactate concentration in workloads up to 6% of body wt. It is interest that the rats’ heart rate decreased with the progression of the intensity and duration of the swimming session that was associated with a slight increase in systolic blood pressure, diastolic blood pressure, and mean blood pressure. The findings offer insight into the rats’ cardiovascular responses during an incremental swimming exercise test.
