IB Sports, exercise and health science A.3.2.3 Health Risks of an Inactive Lifestyle and the Protective Role of Physical Activity Notes

Inactive lifestyles increase chronic disease risk

1. Physical inactivity, characterized by a lack of regular physical activity or exercise, is a significant contributor to the development of several chronic diseases.
2. It not only affects physical health but also mental well-being.

Inactivity increases the risk of chronic disease

1. A sedentary lifestyle is directly linked to several chronic conditions.
2. These conditions often result from the body’s failure to maintain optimal metabolic function, muscle mass, and bone density due to a lack of exercise.
3. The most common diseases associated with inactivity include obesity, type 2 diabetes, cardiovascular diseases, and osteoporosis.
4. A sedentary lifestyle is directly linked to higher mortality rates.
5. People who remain inactive for long periods have a significantly higher risk of premature death compared to those who engage in regular physical activity.

Cardiovascular disease (CVD)

1. These conditions include coronary artery disease, heart attack, stroke, heart failure, and peripheral artery disease.
2. The development of CVD is often influenced by lifestyle factors such as physical inactivity, poor diet, and smoking.
3. Atherosclerosis is the buildup of fatty deposits (plaques) within the arteries, leading to their hardening and narrowing.
4. This process significantly impairs the flow of blood to vital organs, increasing the risk of cardiovascular events such as heart attacks and strokes.

Inactivity increases cardiovascular risk

1. Increased Risk of High Blood Pressure (Hypertension)

1. Sedentary behavior can contribute to the development of hypertension (high blood pressure).
2. When the body is inactive, the heart has to work harder to pump blood, which leads to increased pressure on the artery walls.
3. Over time, this increased pressure can damage blood vessels and contribute to the development of atherosclerosis.

2. Increased Risk of High Cholesterol Levels

1. Physical inactivity can result in high cholesterol, specifically high levels of low-density lipoprotein (LDL) cholesterol, which is often referred to as "bad cholesterol."
2. High LDL levels can contribute to the formation of plaques in the arteries, leading to atherosclerosis.

Plaque formation narrows arteries and raises cardiovascular risk

1. Lack of physical activity contributes to the formation of plaques in the arteries.
2. These plaques consist of fat, cholesterol, and other substances that can restrict blood flow and make arteries less flexible.
3. Over time, these plaques can rupture, leading to blood clots that can block blood flow, causing heart attacks or strokes.
4. The process of plaque formation is a key feature of atherosclerosis, which increases the risk of major cardiovascular events.

Effects of Physical Activity on Cardiovascular Health

1. Increased HDL Cholesterol (Good Cholesterol)

1. Regular physical activity is shown to increase the levels of HDL cholesterol, which acts as a scavenger, removing excess cholesterol from the blood vessels and transporting it to the liver for elimination.
2. Activities like walking, cycling, and swimming have been shown to significantly increase HDL cholesterol levels.

2. Reduced LDL Cholesterol (Bad Cholesterol)

1. Exercise reduces the concentration of LDL cholesterol in the blood by improving the efficiency of fat metabolism.
2. This helps lower the risk of plaque formation in the arteries, reducing the likelihood of atherosclerosis.

3. Improved Vascular Health

1. Regular exercise improves the elasticity of the arteries, making them more flexible and better able to dilate and constrict as needed.
2. This reduces the risk of atherosclerosis and improves overall blood flow.
3. As we age, the arteries naturally lose their elasticity, contributing to atherosclerosis.
4. Exercise helps to maintain this elasticity and keeps blood flow optimal, preventing the buildup of plaques.

Obesity

1. Obesity is typically measured using the Body Mass Index (BMI), with a BMI of 30 or higher indicating obesity.
2. BMI is a useful screening tool, but it doesn't measure body fat directly.
3. Other assessments, such as waist circumference or body fat percentage, can offer more precise evaluations.

Obesity increases the risk of serious health conditions

Obesity is associated with a wide range of serious health conditions that significantly impact both quality of life and life expectancy. These include: