579 00:44:30,160 --> 00:44:34,120 if you are lying in bed asleep, your blood pressure tends to be quite low. 580 00:44:34,120 --> 00:44:36,560 If you are having a game of squash, for example, 581 00:44:36,640 --> 00:44:39,440 the heart is pumping out a lot more blood. 582 00:44:39,440 --> 00:44:41,880 In life, the blood pressure is very variable
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