Blood pressure is the force of your blood pushing against the walls of your arteries. As your heart beats, the ventricles squeeze blood out into the aorta and arteries to travel around the body. At this point, your blood pressure is highest and this is called systolic pressure. When the ventricles of your heart relax and fill, between beats, your blood pressure falls. This is the diastolic pressure.
Maintaining a healthy blood pressure will help to keep your blood circulation at a healthy level – protecting your heart, arteries and blood vessels from becoming damaged. It will also reduce your risk of cardiovascular disease, heart attack, heart failure, kidney failure, stroke and other health issues.
Video: Blood pressure animation NZ Heart Foundation, 2015
Blood pressure is measured at two points in your hearts cycle:
Your blood pressure is measured in millimetres of mercury, which is written as mmHg, and is recorded as systolic blood pressure over diastolic blood pressure, for example 120/70 mmHg.
An ideal blood pressure for most people is less than 130/80.
Your blood pressure changes all the time to meet your body's needs and many things can change your blood pressure including how much you exercise, what you eat and if you smoke or drink alcohol.
Every adult should have their blood pressure checked regularly. How often depends on your age, your risk factors and your general health.
These tips will help you to either reduce your blood pressure, or to keep it at a healthy level:
What is blood pressure? NHS Choices, UK, 2014 Blood pressure NZ Heart Foundation, 2015Blood pressure – Explained Watch, Learn, Live: Interactive Cardiovascular Library – American Heart AssociationThe anatomy of blood pressure Watch, Learn, Live: Interactive Cardiovascular Library – American Heart Association