Special Population ( People suffering from diseases like Hypertension, Coronary Artery Disease, Diabetes Mellitus, Arthritis & Osteoporosis)
Exercise & Diseases
Exercise can prevent diseases.
By now we all acknowledge that exercise is a necessary tool which helps in improving health, prevents diseases and hence decrease health care costs. Exercise has beneficial effects on almost all organ systems of our body ensuring better functioning and preventing a wide range of diseases.
Regular exercise improves health by:
- Reducing the risk of dying prematurely from diseases.
- Reducing the risk of developing diabetes, Hypertension and other heart related diseases.
- Reducing the risk of colon, breast and prostate cancers.
- Helping maintain a healthy weight and develop a positive body image.
- Helping build and maintain strong bones and muscles and thus healthy joints.
- Helping older people with better functional independence i.e. being able to perform their daily tasks with ease and reducing incidences of falls by making their bodies stronger.
- Reducing risk of osteoporosis which is a brittle bone disease.
- Improving immune system (body’s internal system which fights diseases).
- Reducing feelings of depression and anxiety and enhancing sense of well being.
Exercise can control diseases
Various diseases such as hypertension or high blood pressure, diabetes, arthritis, obesity, osteoporosis etc. can be controlled with exercise, medication and proper nutritional care. Thus, an active disease ridden individual can live a better life and has a lower mortality (death) rate than a sedentary disease ridden person.
Benefits of exercise on various diseases:
1. Coronary Artery Disease (CAD)
Coronary Artery Disease (CAD) or Coronary Heart Disease (CHD) is a medical condition in which plaque builds up inside the arteries which supply oxygen-rich blood to the heart muscle.
Fat, cholesterol, calcium and other substances present in the blood leads to the formation of plaque. Plaque reduces the oxygen-rich blood flow to the heart muscle by narrowing the arteries which can cause angina (chest pain) or a heart-attack.
CAD is a very common heart disease and a leading cause of death all over the world. There are various risk factors for this disease which are all interconnected but can be modified with exercise.
1) Cigarette Smoking: Smoking tobacco increases the risk of CAD. Smokers are at a greater risk for heart disease than non smokers. With regular physical activity, smokers are likely to cut down or stop the habit. The risk of heart disease decreases within a year of smoking cessation along with regular exercise.
2) Hypertension: The risk of heart disease increases with an increase in blood pressure. Systolic BP>= 140 mmHg or Diastolic >=90 mmHg is a risk factor. During exercise, the heart muscle is forced to beat faster to keep up with the body’s oxygen demands. This makes it stronger. The blood vessels which supply oxygen-rich blood to the heart also become flexible and are better able to dilate (expand) enhancing blood vessel function and lowering the chances of hypertension. There is an approximate reduction of 10 mmHg in both, Systolic & Diastolic BP in people with mild to moderate hypertension, if they exercise regularly.
3) Dyslipidemia: This refers to abnormalities in blood lipid and lipoprotein concentrations. CAD risk increases if low density lipoprotein (LDL), which is bad cholesterol is greater than 130 mg/dl or High-Density Lipoprotein (HDL), which is a good cholesterol is less than 40 mg/dl or if total cholesterol is greater than 200 mg/dl. Exercise raises HDL and when combined with a nutritious low fat diet, it lowers the LDL.
4) Diabetes Mellitus (DM): (DM is explained in the articles that will follow). If your fasting blood glucose is greater than or equal to 100 mg/dl, you are at CAD risk. Exercise has an insulin like effect which enhances the utilization of Glucose even in the absence of sufficient insulin. Physical activity decreases insulin requirements for people with diabetes. Thus it improves insulin sensitivity and glucose utilization in the body in people with type 1 DM. Exercise enhances fat loss in people with type 2 DM along with improved insulin sensitivity & glucose utilization. Exercise also help burn excess fat and keep a check on your weight. People with a healthy weight are less likely to develop diabetes.
5) Obesity: Being overweight or obese has a direct relationship with all other risk factors of CAD. The risk is greater in people with a lot of fat on the abdomen. A waist circumference greater than 40 inches for men and greater than 35 inches for women or Body Mass Index (BMI) > 30 kg/m2 (Weight in kg divided by height in meter square) or Waist to Hip Ratio (WHR) >= 0.95 in men and >=0.86 in women represent obesity. Exercise helps in burning excess calories. With regular exercise, there is a reduction in overall body fat. Decreased abdominal fat reduces the risk factors for CAD, including dyslipidemia, type 2 DM and hypertension. A combination of diet and exercise is the only way to lose excess body fat & maintain a healthy weight.
6) Sedentary lifestyle: People who do not participate in a regular exercise program for at least 30 minutes or more on most days of the week, carry a risk of CAD. Sedentary lifestyle triggers other risk factors for CAD.
People diagnosed with CAD still have bright chances to control the disease if they start exercising as advised by their doctor. Exercise reduces mortality in people with CAD.
“It is the position of the American College of Sports Medicine that most patients with coronary artery disease should engage in individually designed exercise programs to achieve optimal physical and emotional health. The exercise programs should be modified as indicated by the patient’s cardiovascular and general medical status.”
Exercise prescription for CAD Patients
A) Aerobic or Cardiovascular exercises
Mode:
Walking, Jogging, Cycling, Swimming, Group Aerobics and Rowing.
Intensity:
Moderate intensity of 40% to 70% of HRR (Heart Rate Reserve).
HRR = [(MHR – RHR) x Training Percentage i.e. 40% to 70%] + RHR
MHR: Maximal Heart Rate = (220 – Age)
RHR: Resting Heart Rate = Your Heart Beat in a minute calculated early morning before getting out of bed.
HRR is a method to determine the heart rate at which an individual should be doing an aerobic activity. To know your individual heart rate, you will have to consult your doctor or a qualified fitness professional.
Frequency:
3 to 5 days per week.
Duration:
Start with a 5 to 10 min warm up including stretching exercises followed by a 20 to 40 minutes of continuous aerobic activity and a cool down of another 5 to 10 minutes.
B) Resistance Training:
2 times a week consisting of 10 to 12 exercises for the entire body with 2 to 3 sets of 10 to 12 repetitions.
2. Hypertension
Hypertension is commonly known as high blood pressure. Blood pressure (BP) refers to the pressure of blood which is forced on the inside walls of the blood vessels with every heart beat. The average resting BP is 120 mmHg (Systolic) / 80 mmHg (Diastolic) but when this force exerted by blood is equal to or exceeds 140mm Hg or 90 mm Hg, it is considered high and abnormal and the medical condition is called Hypertension. Hypertension is a heart disease and it increases the possibility of having a heart attack. It is clustered with other risk factors associated with heart disease (example Dyslipidemia, obesity, diabetes). Most of the people with hypertension fall into the moderate or high-risk category for heart diseases.
Exercise can control hypertension by strengthening the heart muscle, increasing the heart’s working capacity, improving blood flow & hence lowering blood pressure. It also helps in decreasing body fat which is one of the causes of high blood pressure. Most individuals have a mild to moderate increases in BP which can be controlled by following an exercise regime, losing excess body fat, reducing salt intake and eating a healthful diet. Exercise reduces the BP by approximately 10 mmHg, both systolic and diastolic, in people with mild to moderate hypertension.
If the BP is very high, say 160/100 or above, medical treatment should be the first step. Once the BP is under control with medications, exercise can decrease it further. In any case, it is always important to consult a doctor.
Exercise prescription for Hypertension Patients
A) Aerobic or Cardiovascular exercises
Mode:
Brisk walking – treadmill or outdoors, cycling – stationary or outdoors, swimming.
Intensity:
At a moderate intensity of 40% to 70% of HRR(Heart Rate Reserve).
Frequency:
Minimum 3 to preferably 7 days a week.
Duration:
30 to 60 minutes. You may do it in parts of 3 sessions of 20 minutes or multiple bouts of short duration (10 to 15 minutes) throughout the day.
B) Resistance Training:
Weight training should be done twice a week. Light weights with more repetitions is suggested.
Important:
Avoid isometric exercises, i.e. where you have to hold or pause for a few seconds and avoid Valsalva maneuvers (holding the breath while weight training or any other exercise).
3. Diabetes Mellitus (DM)
Diabetes Mellitus is commonly known as Diabetes. It is a group of metabolic diseases which disrupts normal metabolism, i.e. the process of converting food to glucose (energy) on a cellular level. It results when the body does not produce enough insulin or if it does, the body cells fail to efficiently respond to insulin.
Insulin is a hormone secreted by the pancreas (a large gland behind the stomach) in our body when we eat food. Its function is to help the body cells use sugar in the form of glucose for energy. This sugar in the blood comes from food and fluids (except water). When we eat food, the pancreas produces the required amount of insulin to stimulate the cells so that they absorb glucose from the blood and store it in the form of glycogen for growth and energy. In people with diabetes, the pancreas either produce insufficient or no insulin at all or if enough insulin is produced, the cells fail to respond appropriately. Thus excess glucose builds up in the blood.
A fasting blood glucose of 126 mg/dl or greater indicates diabetes.
There are three types of diabetes.
Type 1 Diabetes: In this condition, the pancreas produce very little or no insulin at all. An individual with type 1 diabetes will have to inject insulin everyday.
Type 2 diabetes: This is the most common type of diabetes in which the pancreas produces enough insulin but for some reasons the body cells resist to respond to this insulin. This is called Insulin resistance. Thus excess glucose builds up in the blood because the body is not able to use it as fuel.
Obese people are at a greater risk for type 2 diabetes. Extra fat around the mid-section (abdomen) increases the risk of developing resistance to insulin.
Type 3, Gestational Diabetes: This type of diabetes develops during pregnancy. Usually it disappears after child birth but there are chances that a woman, who had gestational diabetes, develops type 2 diabetes sooner or later in life.
Diabetes affects almost every part of the body. It often leads to vision disturbances (blindness), cardiovascular disease (heart & blood vessel disease), stroke (loss of brain function due to lack of oxygen-rich blood), kidney failure & nerve damage. It can complicate pregnancy and lead to birth defects in a child. The treatment for diabetes involves medication, healthy diet and regular exercise as advised by the doctor.
During exercise, the muscles use sugar from the blood for energy thus bringing down the blood sugar level. The amount of blood sugar level reduced depends upon the duration (how long) and intensity (how hard) of exercise. Regular exercise helps burn body fat in obese people and hence reduces their risk of developing type 2 diabetes. A well planned exercise regime lowers blood sugar by improving insulin sensitivity. It reduces insulin resistance by helping the cells accept insulin efficiently. It improves blood circulation, strengthens heart & lungs, control blood pressure and maintains a healthy weight. All this decreases the risk of diabetes-related complications.
Exercise prescription for Diabetes
A) Aerobic or Cardiovascular exercises
Mode:
Brisk Walking, Jogging, Cycling, Swimming & Group Aerobics.
Intensity:
50% to 80% of HRR (Heart Rate Reserve).
Frequency:
3 to 7 days per week. Daily exercise will help more in controlling glucose levels.
Duration:
20 to 60 minutes.
B) Resistance Training:
Train with weights for a minimum of 2 times a week with a gap of at least 48 hours between sessions. Light weights with more repetitions are suggested. Start with 10 to 15 repetitions and then progress to 15 to 20 repetitions.
Special Considerations:
- Glucose levels should be monitored pre and post exercise.
- An individual should not exercise if fasting glucose level is greater than 250 mg/dl.
- Insulin should not be injected into exercising muscle. Injection in the abdomen is recommended.
- Hypoglycemia (Low blood sugar levels or a rapid drop in glucose) is common condition for people with diabetes who exercise. They should check with their doctor for signs and symptoms of hypoglycemia pre and post exercise.
4. Arthritis
Arthritis is a disease characterized by stiffness, inflammation, pain and loss of joint function. The range of movement at the affected joints gets restricted leading to a less active lifestyle. This in turn causes muscle weakness and fatigue and hence loss of functional independence for an arthritic patient.
The primary goal of an individual suffering from arthritis should be to improve the ability to perform normal daily activities without undue fatigue and pain, improve cardiovascular & muscular fitness, improve joint mobility and flexibility and decrease pain and swelling.
Exercise is possible and highly beneficial for the treatment of arthritis. It is also a cost effective alternative to medication and surgery. Regular exercise strengthens the muscles around joints. It lubricates the joints and reduces pain and stiffness. Exercise also helps to enhance endurance (stamina), fat loss and facilitate long term weight maintenance in arthritic patients who are overweight. Always remember to start slowly and consult your doctor before participating in any exercise plan.
Exercise prescription for Arthritis
A) Aerobic exercise
Mode:
Brisk Walking, Cycling, Swimming & Rowing.
Intensity:
50% to 85% of HRR (Heart Rate Reserve).
Frequency:
3 to 5 days a week.
Duration:
30 to 60 minutes.
Start with a 5 to 10 minutes warm up preceding the 30 to 60 minutes endurance phase, succeeding by a 5 to 10 minutes cool down.
B) Resistance Training:
Begin with a 5 to 10 min warm up including stretches for all the major joints. The resistance training program should incorporate exercises for all the major muscle groups and not just those supporting the arthritis affected joints.
Mode:
Free weights, Nautilus (machine weights), Elastic bands, Isometric exercises (Exercises in which you have to hold a position for a few seconds).
Intensity:
The intensity should be personalized to suit the individual’s need & abilities and will vary between individual.
Frequency:
2 to 3 days per week with a gap of 24 to 48 hours for recovery.
Duration:
30 to 60 minutes (will vary between individuals).
C) Flexibility Training:
Flexibility exercises (stretching exercises) should be performed one to two times daily. These exercises should induce static stretches held for 15 to 30 seconds. The index of intensity should be a pain free range of motion at the joints.
As with any exercise training, flexibility exercises should also be preceded with an adequate warm up to increase internal body temperature and blood circulation which leads to an efficient exercise session.
D) Special Considerations:
- In any single exercise session, proceed from flexibility exercises to strength training to aerobic exercise.
- Functional activities such as climbing stairs, sit to stand, should be done daily.
- Exercise should be avoided during an arthritic flare-up.
- High impact exercises like jumping,running,which may stress the affected joints should be avoided.
- Avoid high repetition, high resistance and weight training exercises that may cause increased joint pain.
- Do not overstretch unstable joints. During a stretching session, bouncing style stretches (stretches where the speed of movement is uncontrolled) should be strictly avoided.
5. Osteoporosis
Osteoporosis is a brittle bone disease characterized by an abnormal loss of bone tissue leading to fragile porous bones. When bones lose density, they are prone to fractures even with minimal trauma and from lifting and bending impacts. The common sites for bone loss are spine, hips and wrists. Osteoporosis is most common in women, especially post menopause, but it can also affect men as they age. Major causes of this disease are an undernourished diet low in calcium and vitamin D and lack of exercise.
Exercise, at any age, helps in building and maintaining bone density. Osteoporosis can be prevented by a combination of certain nutrients (calcium and vitamin D) from a well balanced diet and a regular exercise regime started early in life. However, after adulthood also it is not too late to start. Weight bearing exercises stimulate bone formation and retain calcium in the bones that bear the load. During weight bearing exercises, the force of muscles pulling against bones stimulate the bone building process thus strengthening that bone. It is important to note that bone strengthening is site specific, i.e. if you weight train your legs, the bones of the legs only will strengthen and if you load your upper body with weight exercises, you will strengthen the related bones only. Exercise increases balance, coordination and muscle strength, which decreases the likelihood of falls in the elderly.
At present, there is no known cure for osteoporosis but medicinal treatment combined with an exercise regime can slow down and even reverse its effect. Weight bearing exercises are the most effective in the treatment of osteoporosis but certain exercises may be harmful in advanced osteoporosis. Thus, physician’s approval is warranted prior to beginning any exercise routine.
Exercise prescription for Osteoporosis
A) Aerobic exercise
Mode:
Walking, Cycling, aquatic exercises (exercises in the swimming pool).
Intensity:
40% to 70% of HRR (Heart Rate Reserve).
Frequency:
3 to 5 days a week.
Duration:
20 to 60 minutes, continuous or intermittent.
B) Resistance Training:
Weight training for all the major joints as well as affected bones should be done for twice or thrice a week. Two to three sets of each exercise and 8 to 10 repetitions for every set are recommended. Intensity will vary between individuals and their respective case history.
Specific exercises focusing on balance and coordination should also be included. Functional exercises that mimic activities of daily living (chair sit and stand, vigorous walking) should be performed for two to five days a week.
C) Flexibility Training:
Stretching exercises should be performed 5 to 7 days a week. Static stretches (holding a position gently) are recommended.
D) Special Considerations:
- Explosive movements and high impact loading exercises such as jumping, sprinting, running, jogging should not be performed.
- Patients severely limited by pain should not exercise and consult the doctor.
- Excessive forward bending and twisting of the spine is contraindicated as it increases the risk of spinal fracture.
- Daily activities such as sitting and bending forward to pick up objects can lead to spinal fractures in advanced osteoporosis.