Blood pressure is the force of blood pushing against artery walls. Systolic (top number) is pressure during heartbeat; diastolic (bottom number) is pressure between beats. Normal: below 120/80 mmHg. The AHA classifies five stages from normal to hypertensive crisis.
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Pro Tip
Measure blood pressure after 5 minutes of seated rest, twice per session, in the same arm each time. One reading means very little — trends over many readings are what matter.
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Did You Know?
Blood pressure naturally follows a circadian rhythm — it dips 10–20% during sleep (dipping) and rises sharply in the morning. This "morning surge" is associated with increased risk of heart attack and stroke.
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