You may have noticed your healthcare professional checking your blood pressure at each office visit. But why is knowing your blood pressure so important? To answer that question, we have to understand what blood pressure is and why it matters. This article examines blood pressure as it relates to heart health.
Your doctor will give you two numbers after checking blood pressure. The first number is referred to as the systolic blood pressure. This is a measurement of the amount of pressure in your arteries when your heart muscle contracts pushing blood into the arteries. The second number is called the diastolic blood pressure. This is the pressure in your arteries between heart beats or when the heart is not contracting.
Numbers are measured in millimeters of mercury (mm Hg) and written as 120/80 for example. Numbers higher than a normal range indicate your heart is working too hard to pump blood to the rest of your body. This can put too much stress on your heart as well as damage the linings of arteries causing damage to blood vessels in the eyes or kidneys for example.
What is a healthy blood pressure?
What is a normal range for blood pressure? Ideally, you want a systolic blood pressure (first or top number) to be between 90 and 120 mm/Hg. The diastolic blood pressure (second or bottom number) should be between 60 and 80 mm/Hg. So a blood pressure between 120/80 and 90/60 is good. This means your heart is working at optimum efficiency without excessive force against the walls of blood vessels but with enough force to get oxygenated blood to the rest of your body.
Can blood pressure be too low?
If blood pressure is too low (below 90/60) then tissues will be deprived of oxygen. Blood pressure that is too high (above 120/80) is called hypertension and blood pressure that is too low (below 90/60) is called hypotension. Your body prefers a happy medium to keep things working well.
Good blood pressure for heart health
The next question is how do we maintain a healthy blood pressure? Lifestyle plays a major role and includes a healthy diet, exercise, maintaining a healthy weight, not smoking, avoiding excessive alcohol intake and stress management. If you have a family history of high blood pressure (hypertension) you will want to be even more diligent about these things.
Diet and blood pressure
Key dietary factors for controlling blood pressure include getting enough fruits and vegetables and reducing excess sodium. This provides the right balance of minerals ( e.g. potassium, magnesium) for blood pressure control. Too much salt in the diet can increase sodium in the blood stream which reduces the kidneys ability to get rid of excess fluid. The fluid retention causes an increase in blood pressure. The more salt you consume, the more fluid you will retain and the higher your blood pressure will be. This is why lowering your salt intake with diets such as the DASH diet can help. Limiting salty snacks, eating out less frequently and using less salt when cooking can all contribute to a healthier diet for your heart.
Sodium and Blood Pressure
The American Heart Association recommends guidelines based on research showing what is effective for reducing blood pressure and heart disease. They recommend no more than 2,300 milligrams of salt (equal to a teaspoon) per day. For those who already have high blood pressure, they recommend limiting to 1500 milligrams (3/4 teaspoon) per day. For a review of research regarding the relationship between sodium intake and blood pressure, check out this 5-minute video by Dr. Michael Greger at NutritionFacts.org. These are just a few of the compelling arguments for reducing sodium intake. Limiting caffeine may also help in some people. Incorporating omega 3 fatty acids from fish or flaxseed helps. Getting adequate amounts of magnesium, potassium and calcium from fruits, vegetables and low fat dairy is important. Increasing fiber with whole grains can help. Taking a CoEnzyme Q10 (CoQ10) supplement can also be beneficial especially if you take a statin drug to lower cholesterol.
Exercise for heart health
Exercise helps to strengthen the heart muscle making each heartbeat more efficient. Aerobic exercise such as walking, biking or swimming for at least 30 minutes a day 5 days a week is good for the heart. Exercise can also help with stress management. And we all know stress can wreak havoc on our health. Maintaining a healthy weight, especially as we age, is a great way to keep blood pressure controlled. A healthy diet and exercise will help with weight loss. If you have a family history of high blood pressure, be sure to have it tested often and reduce your other risk factors as much as possible.
| Blood Pressure Number | What it Means |
| < 120 / 80 | Normal |
| 121-139 / 81-89 | Pre-hypertension |
| 140-159 / 90-99 | Hypertension, stage I |
| > 160 / > 100 | Hypertension, stage II |
| >180 / >110 | Hypertensive Crisis |
Diagnosis: High Blood Pressure (Hypertension)
To be diagnosed with high blood pressure (hypertension) your blood pressure reading must be above 140/90. And this must occur with several readings on different days. One elevated blood pressure is not enough for a diagnosis. Your doctor may want to test it frequently over several days or weeks or have you monitor at home. For blood pressure that remains elevated, diet and lifestyle interventions come first. If diet and lifestyle changes alone are not sufficient to lower the numbers, then medication will be considered next.
An extremely high blood pressure reading (above 160/100), may prompt your doctor to run some tests to determine if there is a specific cause. If there is a reason for the high blood pressure, this will be treated first. Nevertheless, high blood pressure should be taken seriously since it is a major risk factor for heart attacks and stroke as well as kidney disease and dementia.
Here is my checklist for getting blood pressure under control
- If you are overweight or obese, start making changes to lose weight today. Even a small reduction in bodyweight can make a difference.
- If you smoke, stop! Get help as needed. Smoking causes vasoconstriction (narrowing of the blood vessels) which can make blood pressure go up.
- Limit your salt! Look at labels and avoid canned soups and packaged foods with more than 400 milligrams of sodium per serving. Other high sodium foods include hotdogs, bacon, luncheon meats and pickled foods.
- Eat more fruits and vegetables. These are naturally low in sodium but provide potassium, magnesium and even some calcium. They are also low in calories and can help with weight loss.
- If you drink alcohol, limit to no more than 2 drinks for men and 1 drink for women per day.
- Relax! Find ways to reduce your stress by engaging in hobbies you enjoy, listening to music, taking a walk, getting a massage or talking to a close friend. Deep breathing can also help you feel more relaxed.
Take care of your blood pressure for a healthy heart!
