How men and women differ
Heart disease has long been recognized as a male health problem, but it's the number one killer of women in Canada. Learn about gender differences in heart health.
We take our hearts for granted when we’re young. No matter what we do, our hearts just keep on ticking, pumping oxygen-rich blood to our cells and organs. But as we get older, many of us start to pay closer attention—men sometimes more than women.
A man’s story?
Up until fairly recently, when it came to heart health most of the attention seemed to be focused on men. Women’s major concern about heart disease was whether the men in their lives were at risk.
This attitude was well founded, since most medical research and guidelines around heart health centred on men. It wasn’t until 2004 that the American Heart Association published its first guidelines for cardiovascular disease prevention in women, including a set of clinical recommendations specifically intended for women’s individual level of risk.
This was because research on cardiovascular disease—and most other health issues—has traditionally involved primarily men. This problem was addressed a number of years ago when the US passed legislation and Canada issued guidelines to increase the representation of women and minorities in clinical trials.
It seems, though, that research is still catching up: according to subsequent studies women are still not included in enough mixed-sex cardiovascular trials to reflect the prevalence of the disease in women.
So what are the numbers for women?
According to the Heart and Stroke Foundation, about half of women surveyed recently were well aware that heart disease was the leading killer of women. But only 13 percent of them agreed that it was their own greatest health risk. Their biggest health concern was developing breast cancer.
Canadian women, though, are well represented in the statistics for heart disease and its risk factors:
The heart’s gender divide
When it comes to heart health in general, the gender divide is enormous. Not only are women under-represented in cardiac research, but, largely as a result, women often don’t recognize their risk of heart disease when associated with risk factors such as high blood pressure and high cholesterol.
Likely also a consequence of the dearth of research involving women and heart health, women are less likely to get treatment for heart disease, which is still largely perceived to be a man’s disease.
As a result, according to the Heart and Stroke Foundation, women are less likely to be admitted to intensive care treatment, cardiac rehabilitation programs, or to receive interventions such as bypass surgery.
To learn more about why we may be so different—women versus men—in matters of the heart, we’ve compiled a list of areas in which our sex makes all the difference for our hearts.
Anatomy of the Heart
It shouldn’t be a surprise, given the average woman is much smaller, proportionally, than the average man, that a woman’s organs may differ in size. The heart is no exception.
Men: An average man’s heart weighs about 11 ounces (315 g). The aorta (the artery that takes blood from the heart to the rest of the body) is wider in a large man—about an inch (2.5 cm).
Women: A woman’s heart weighs about 9 ounces (265 g)—2 ounces (50 g) less than a man’s. The aorta in a small woman is narrower than a man’s—about half an inch (1.5 cm). In general, women’s coronary arteries are much smaller and lighter than men’s. Because of this, diagnostic and surgical procedures designed for men are more difficult and often less successful for women.
Heart rates for both men and women differ because of their sizes, but will also differ depending upon their level of athletic fitness. Someone who regularly engages in aerobic training will have a lower heart rate than that of someone who is sedentary.
The peak heart rate also differs for women from that of men. This is important not only as a measurement of exercise efficiency, but also as a tool to predict risk of heart-related death during a stress test.
Men: The peak heart rate for men is calculated by subtracting the man’s age from the number 220 (220 minus age).
Women: The peak heart rate for women is calculated by subtracting 88 percent of the woman’s age from the number 206 (206 minus 88% of age). This new formula for women changed only recently on advice from researchers following a large study involving 5,437 healthy women ages 35 and older, which began in 1992.
Too much cholesterol in the blood is a major risk factor for heart disease. Excess cholesterol can settle on the inside of blood vessels, creating plaque buildup, which restricts blood flow, thus increasing the risk of a heart attack or stroke.
Men: Men’s cholesterol levels increase with age, as do women’s. But men’s levels tend to be higher than women’s until women reach the age of menopause. Recommendations for regular cholesterol level tests start at the age of 40 (or earlier if other risk factors exist).
Women: Before menopause, women’s estrogen levels help protect them from heart disease by increasing HDL (good) cholesterol and decreasing LDL (bad) cholesterol levels. After menopause, however, women’s total cholesterol levels rise higher, in general, than men’s.
Having diabetes—whether you’re a man or a woman—increases risk of heart disease because it increases other risk factors, such as high blood pressure, coronary artery disease, and stroke, especially if blood sugar levels are poorly controlled.
Men: Men with diabetes have a greater risk of developing heart disease than men who don’t have diabetes. But women with diabetes fare worse.
Women: Women who have diabetes have a higher risk of heart disease than men do—almost 50 percent higher. Although we don’t yet know why this is, researchers believe it may be associated with the fact that women are more likely to have more additional risk factors, such as obesity, hypertension, and high cholesterol along with a possible disparity in treatment.
A group of health risks, including large waist size, elevated blood pressure, insulin resistance, low HDL cholesterol, and high triglycerides, metabolic syndrome triples the risk of heart disease, stroke, and diabetes.
Men: Men with metabolic syndrome have an increased risk of cardiovascular diseases, but less so than women.
Women: In women, metabolic syndrome seems to pose the most important risk factor for having heart attacks at an early age. According to a Harvard Medical School study of patients undergoing bypass surgery who also had metabolic syndrome, women were more likely than men to die within eight years.
Although smoking is well known to pose a major risk for lung cancer and raises the risk for emphysema, stroke, infertility, reduced bone density, and other forms of cancer, it is also a huge risk factor for heart disease.
Men: Among men who smoke and who also have high blood pressure and raised cholesterol levels, life expectancy from age 50 is 10 to 15 years shorter than men without those risk factors. But they still fare better than women who smoke.
Women: Women who smoke are 25 percent more likely to have heart disease than men who smoke, according to a systematic review and meta-analysis of studies published between 1966 and 2010 undertaken in 2011.
Symptoms and warning signs
We’re all familiar, especially through media such as movies and television, with the classic chest-grabbing pain of a man undergoing a heart attack. But the truth, as usual, is more complex.
Many studies in the last couple of decades pointed to a substantial difference between men and women when it came to symptoms of heart attack. A large study published in 2009 established that women do experience the same heart attack symptoms as men, but also have additional symptoms.
Men: The range of symptoms for both women and men are somewhat similar, but additional symptoms may often appear in women. Typical symptoms for both men and women include:
Women: According to the Heart and Stroke Foundation, though both men and women may experience typical or nontypical symptoms, women are far more likely to have additional symptoms including throat, jaw, and neck discomfort.
According to a Heart and Stroke Foundation statement attributed to Dr. Beth Abramson, Director of the Cardiac Prevention and Rehabilitation Centre and Women’s Cardiovascular Health at St. Michael’s Hospital, while women may describe their pain differently than men, the most common symptom in women is still chest pain. The challenge, according to Abramson, is that women are less likely to believe they’re having a heart attack and they are more likely to put off seeking treatment.
There are some risks for heart disease that we can’t do anything about, such as our family history and our age. But there are plenty of risks that we can reduce, if not completely eliminate, by simply modifying some basic lifestyle choices.
If you smoke, stop.
Smoking or exposure to second-hand smoke increases our risk of heart disease by increasing blood pressure, building up plaque and blocking arteries, and reducing oxygen in the blood. Once a smoker quits, heart disease risk diminishes.
It may taste good, but is it good for heart health? If what we’re eating is loaded with sodium or contains saturated or trans fats, and we don’t get enough fruits, vegetables, fibre, and sources of heart-healthy omega-3 fats, we may be contributing to heart disease risk.
We can eat heart healthy by
Because lack of exercise is associated with extra risk for heart disease, getting enough of it is critical. To make a difference, we should get a total of at least 150 minutes of moderate- to vigorous-intensity aerobic activity per week, in bouts of at least 10 minutes. In addition, we need strengthening exercises at least 2 days per week.
Getting physically active reduces the risk by
Talk to a health care professional before starting a new exercise regimen.
Though we all face stress in our lives, too much can be harmful to our health—and particularly to our heart. The exact link between heart disease and stress is still not completely understood, but it is known that people under stress may experience higher blood pressure and cholesterol levels. Research also points to a higher chance of developing blood clots. As well, someone under stress may be more likely to eat poorly, smoke, and drink to excess as well as skip exercising.
The following suggestions may help counter the daily buildup of stress.
Things you can’t change:
Things you can change:
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