MacDonald J, MacDougall J, Hogben C
Departments of Kinesiology and Medicine, McMaster University, Hamilton, Ontario, Canada.
J Hum Hypertens. 1999 Aug;13(8):527-31. doi: 10.1038/sj.jhh.1000866.
Ten normotensive, recreationally active participants aged 35.0 +/- 16.3 years, volunteered to participate in the study. Average baseline blood pressure (BP) was 132/75 mm Hg for systolic (SBP) and diastolic (DBP) pressure respectively. On two separate days, participants underwent testing in a randomised, repeated measures fashion such that they performed 30-min bouts of cycle ergometry at a power output which elicited 50 or 75% of VO2 Peak. Blood pressure was monitored continuously throughout the session by the Finapres method with 2-min windows recorded at rest, 5, 10, 15, 30, 45 and 60 min post exercise. SBP was similar between the two trials and became hypotensive at 5 through 15 min post exercise. The largest decrement (8 mm Hg) in SBP occurred 5 min post exercise. DBP was also unaffected by the intensity of exercise and was lower than before exercise at 5 and 15 through 45 min post exercise. Similarly, mean arterial pressure (MAP) showed significant decrements at 5 and 15 through 45 min post exercise irrespective of exercise intensity. Heart rate was greater during the 75% intensity than during the 50% intensity trial. Pre-exercise values were re-established by 45 min post exercise. VO2 remained significantly elevated above pre-exercise values in both trials until 15 min post exercise. Haematocrit increased significantly during both exercise bouts but returned to pre-exercise values by 10 min post exercise. This study indicates that cycle ergometry at 50 and 75% of VO2 Peak elicit similar reductions in post exercise BP. Therefore bouts of mild to moderate intensity exercise may be beneficial in the control of hypertension.
10名血压正常、有运动习惯的参与者，年龄为35.0±16.3岁，自愿参与该研究。收缩压（SBP）和舒张压（DBP）的平均基线血压分别为132/75 mmHg。在两个不同的日子里，参与者以随机、重复测量的方式接受测试，即他们在功率输出下进行30分钟的自行车测力计测试，该功率输出引发了50%或75%的最大摄氧量（VO2 Peak）。在整个测试过程中，通过Finapres方法连续监测血压，在运动前休息时、运动后5、10、15、30、45和60分钟记录2分钟的窗口数据。两次试验之间的SBP相似，并且在运动后5至15分钟时变为低血压。SBP的最大降幅（8 mmHg）发生在运动后5分钟。DBP也不受运动强度的影响，并且在运动后5分钟以及15至45分钟时低于运动前。同样，无论运动强度如何，平均动脉压（MAP）在运动后5分钟以及15至45分钟时均显示出显著下降。在75%强度试验期间的心率高于50%强度试验期间。运动后45分钟时恢复到运动前的值。在两个试验中，直到运动后15分钟，VO2仍显著高于运动前的值。在两次运动期间血细胞比容均显著增加，但在运动后10分钟时恢复到运动前的值。这项研究表明，在50%和75%的VO2 Peak进行自行车测力计测试会引起运动后血压的相似降低。因此，轻度至中度强度的运动可能有助于控制高血压。
