其他摘要：Factors related to exercise mode like muscle mass mobilization, weight bearing tip and arm and trunk activity can promote different cardiovascular responses. The goal of this study was to evaluate the influence of the treadmill gradient in the cardiovascular acute responses to exercise. The sample comprised 10 voluntary normotensive female subjects (age mean=19.6, s= 1.1 years, weight mean=55.9, s= 6.2 kg, height mean= 163, s= 0.1 cm and body fat mass mean=17.9, s= 2.6 %). All the subjects performed two 10 minutes exercise bouts, the first with 0% gradient and the second with 15% gradient. The average speed was 6.28, s= 0.25 km/h and all subjects rested for 30 minutes at the end of each exercise periods. Heart rate, systolic and diastolic blood pressure were measured before and after each bout and rest period. Perceived exertion was also measured after exercise. The repeated measures t-test revealed that the 0% gradient exercise promote an increase in systolic and diastolic mean blood pressure (124.7, s= 15.9 and 68.4, s= 11 mmHg respectively), heart rate mean 144.1, s= 16.7 bpm and perceived exertion 11.4, s= 1.7), but after the subjects performed the exercise with 15% gradient they reached higher values (systolic blood pressure was 145.2, s= 13.3; diastolic blood pressure was 75.1, s= 11.4; heart rate was 171.9, s= 16.6 and perceived exertion was 13.9, s= 1.1) in both exercise bouts p<0.05. At the end of recovery period, both systolic and diastolic blood pressure values weren¿t different between gradient (p>0.05). At the end of recovery periods, only the heart rate values were significant, after the first period 68, s= 13 bpm and after the second one 72, s= 15 bpm (p<0.05). Despite the blood pressure differences identified in the exercise periods between the two bouts, the exercise gradient did not accounted for different response in the blood pressure recovery values after 30 min period. Probably the gradient changes do not promote a different hemodynamic response. Varying exercise gradient from 0% to 15% in young normotensive female subjects did not influence the magnitude of blood pressure after 30 minutes recovery.
