Typically, both systolic and diastolic pressures tend to climb or fall together, but that's not always the case.

一般来说，收缩压和舒张压是同时上升或者下降的，但也并不总是这样。

The second reading is your diastolic blood pressure, which is the pressure in your arteries when the ventricles are relaxed.

第二个读数是你的舒张压，这是心室放松时动脉中的压力。

Now, 'normal' systolic blood pressure is defined as less than 120 mmHg, and a normal diastolic pressure is less than 80 mmHg.

现在，正常的收缩期血压被定义在120mmHg以下，正常的收缩压则是应该小于80mmHg。

Blood pressure is recorded in millimeters of mercury (mmHg) with systolic pressure written first, followed by diastolic pressure.

血压以毫米汞柱（mmHg）记录，先记录收缩压，然后记录舒张压。

In specific clinical conditions, such as individuals with diabetes or hypertension, HIIT was able to better improve factors like glycemic control and diastolic blood pressure.

在一些特殊的临床试验条件下，如对有糖尿病或高血压的人群测试，表明 HIIT 能更好地改善一些指标，如血糖控制和舒张压。

These guys are really stretchy, kind of like Spandex and this is what allows these arteries to keep their shape, as well as absorb and even-out the systolic and diastolic pressures.

它们很有弹性，有点像Spandex弹力衣；这使动脉得以保持形状，以及承受、平衡收缩压和舒张压。

Finally, if the blood pressure gets really high really fast, it's referred to as a hypertensive crisis, and involves a systolic greater than 180 mmHg or a diastolic pressure greater than 120 mmHg.

如果血压变得很高而且上升得很快，最终可能会变成高血压危象：收缩压大于180mmHg，舒张压大于120mmHg。