Browse evidence-based analysis of health-related claims and assertions
Even if you work out at the gym or go for runs after work, having a job that requires heavy physical labor might still be bad for your health — which is the opposite of what most people expect.
Correlational
Even if you exercise regularly in your free time, having a very physically demanding job can still make your risk of dying from heart disease more than six times higher than someone with a less active job.
If you’ve never smoked but have a very physically demanding job, your risk of dying from heart disease is more than three times higher than someone with a less active job — even if you’re otherwise healthy.
People with very physically demanding jobs, like lifting heavy things all day, are more likely to die from heart problems than people with less active jobs — even if they exercise in their free time.
People who do physically demanding jobs, like construction or farming, may be more likely to die sooner than people with less physically demanding jobs — especially if they’re younger or women.
Even though super-fit people have more calcium in their heart arteries, they still live longer and have fewer heart attacks — their fitness seems to protect them from the danger of the plaque.
If an athlete has a high calcium score on a heart scan (over 100), doctors should treat them like someone with early heart disease — lower their bad cholesterol and test how their heart handles exercise.
Descriptive
Even if you’re super fit, if you have hidden heart artery disease, doing something really intense — like a marathon — can suddenly trigger a heart attack or cardiac arrest.
Even though athletes have more plaque, it’s usually hard and chalky, not soft and gooey — so it’s less likely to suddenly break off and cause a heart attack.
Mechanistic
Older athletes who train hard for many years tend to have more calcium deposits and fatty buildups in their heart arteries, but these buildups are usually hard and stable, not soft and dangerous.
New tests like heart scans for calcium buildup and DNA tests for inherited heart defects might help doctors better guess which athletes are at highest risk of sudden death.
To prevent athletes from dying suddenly, we need a mix of better heart tests, healthy lifestyle advice, teaching people to recognize warning signs, and having defibrillators ready at sports events.
Standard heart tests like EKGs and treadmill tests often miss clogged arteries in older athletes, so doctors might need to use special CT scans to find these hidden problems.
Young athletes who die suddenly during sports usually have a birth defect in their heart arteries, while older athletes die from clogged arteries — two different problems at different ages.
Older athletes who look healthy can still have hidden clogged arteries that suddenly cause their heart to stop, which is why we need better ways to find these problems before it's too late.
In individuals engaged in high-volume endurance exercise, optimal cardiovascular health requires concurrent management of traditional cardiovascular risk factors such as dyslipidemia, hypertension, and insulin resistance.
Assertion
High levels of physical fitness do not confer complete immunity against the development of coronary atherosclerosis.
High-volume endurance training is not associated with an increased incidence of acute myocardial infarction.
Coronary artery plaque in high-volume endurance athletes is predominantly subclinical, detectable only via imaging modalities such as coronary CT angiography, and is not associated with symptomatic ischemia or angina.
Regular physical activity, regardless of its association with subclinical coronary plaque, is associated with a reduction in all-cause mortality.
High-volume, high-intensity endurance exercise increases coronary artery plaque burden without increasing all-cause or cardiovascular mortality risk in otherwise healthy individuals.
The presence of increased coronary artery plaque in high-volume endurance athletes is not associated with a higher incidence of clinical cardiovascular events such as myocardial infarction or cardiac death.
The association between cumulative exercise volume and coronary plaque burden is significantly amplified when the volume includes a high proportion of high-intensity training sessions.
Comparison
Chronic high-volume endurance exercise is associated with the development of calcified coronary artery plaque, which is biomechanically more stable and less prone to rupture than non-calcified or mixed plaque.