Cardio Activity and Your Heart

The most important factor for improving cardiorespiratory fitness (cardio or CR) is the intensity of the workout. Changes in CR fitness are directly related to how "hard" an aerobic exercise is performed. The more energy expended per unit of time, the greater the intensity of the exercise, the greater the effect on cardiorespiratory fitness.

You have to know how hard is "hard" to determine if an aerobic exercise like running is producing a CR training effect or if it's just burning a few calories. The heart rate during work or exercise is an excellent indicator of how much effort you are exerting. Only by keeping track of your heart rate during a workout can you be sure that the intensity is enough to improve your CR fitness level. In other words, your ability to monitor your heart rate is the single most important key to success in CR training.

Training Heart Rate (THR) = Desired Intensity of the Workout

THR is the heart rate at which you need to exercise to get a training effect. The U.S. Army fitness gurus have given us two methods to determine THR. The first method, percent maximum heart rate (%MHR) is simpler to use, while the second method, percent heart rate reserve (%HRR) is more accurate.

%MHR Method

With this method the THR is figured using the estimated maximal heart rate. You can estimate your maximum heart rate (MHR) by subtracting your age from 220. Thus, a 20 year old would have an estimated maximum heart rate (MHR) of 200 beats per minute (220 - 20 = 200).

A person who is in poor shape should exercise at 70 percent of his MHR; if he is in relatively good shape, at 80 percent MHR; and, if he is in excellent shape, at 90 percent MHR.

Examples:

A 20 year old in good physical condition would have a THR of 160 beats per minute (BPM). 220 - 20 = 200 * .80 = 160 BPM.

A 30 year old in good physical condition would have a THR of 152 beats per minute (BPM). 220 - 30 = 190 * .80 = 152 BPM.

A 40 year old in poor physical condition would have a THR of 126 beats per minute (BPM). 220 - 40 = 180 * .70 = 126 BPM.

%HRR Method

A more accurate way to calculate THR is the %HRR method. The range from 60 to 90 %HRR is the THR range in which people should exercise to improve their CR fitness levels. If you know your general level of CR fitness, you can determine which percentage of HRR is a good starting point

for you. For example, a person in excellent physical condition could start at 85 percent of his HRR; if he is in reasonably good shape, at 70 percent HRR; and, if he is in poor shape, at 60 percent HRR.

Most CR workouts should be conducted with the heart rate between 70 to 75 percent HRR to attain, or maintain, an adequate level of fitness. A person who has reached a high level of fitness may derive more benefit from working at a higher percentage of HRR, particularly if he cannot find more than 20 minutes for CR exercise.

Exercising at any lower percentage of HRR than 60 does not give the heart, muscles, and lungs an adequate training stimulus. Exercising at more than 90 percent can be dangerous. Before anyone begins aerobic training, he should know his THR (the heart rate at which he needs to exercise to get a training effect).

The example below shows how to figure the THR by using the resting heart rate (RHR) and age to estimate heart rate reserve (HRR). A 20 year old in reasonably good physical shape is the example.

STEP 1: Determine the MHR by subtracting your age from 220. i.e. MHR = 220 - 20 = 200.

STEP 2: Determine the resting heart rate (RHR) in beats per minute (BPM) by counting the resting pulse for 30 seconds, and multiply the count by two. A shorter period can be used, but a 30 second count is more accurate. This count should be taken while you are completely relaxed and rested. For this example we use a RHR of 69 BPM.

STEP 3: Determine the heart rate reserve (HRR) by subtracting the RHR from the estimate MHR. i.e. HRR = 200 - 69 = 131 BPM

STEP 4: Calculate THR by (1) multiplying HRR by the relative fitness level as a percentage and (2) adding the result to the HRR. For example, our 20 year old in good physical condition will exercise at 70% HRR.

(1) .70 * 131 = 91.7
(2) 91.7 + 69 = 160.7

In summary, a reasonably fit 20-year-old with a resting heart rate (RHR) of 69 BPM has a training heart rate (THR) goal of 161 BPM.

During aerobic exercise, the body will usually have reached a "Steady State" after five minutes of exercise, and the heart rate will have leveled off. At this time and, immediately after exercising, is when you should monitor your heart rate to see if you are within your desired THR range.

If your pulse rate is below the THR, you must exercise harder to increase your pulse to the THR. If your pulse is above the THR, you should reduce the intensity to reduce the pulse rate to the THR goal.

Of all the organs of our body the heart is without doubt the most critical and rightly so as, if it stops pumping blood around the body and delivering vital oxygen to the other organs, including the brain, death will occur very quickly.

Despite its importance however many of us pay little if any attention to the health of our heart until forced to do so, when it is often too late. And yet keeping a check on the heart by simple routine measurement of our blood pressure could not be easier.

As with most things in life, if the heart starts to run into problems then there will be warning signs giving us time to take remedial action and these warning signs often come in the form of abnormally high or low blood pressure.

The principle role of the heart is to take freshly oxygenated blood and pump it through the main arteries and then through a network of smaller blood vessels to all parts of the body. As the heart contracts forcing blood out into the arteries pressure is exerted on the walls of the arteries. Then, as the heart relaxes and its chambers refill ready to pump again the pressure in the arteries falls.

By measuring these two pressure levels we can get an indication of just how well the heart is pumping blood around the body and thus see whether or not it is working normally.

Until quite recently it was necessary to visit the doctor's office to have your blood pressure measured. The doctor would place a cuff around your upper arm roughly at the level of the heart. He would then place his stethoscope over the brachial artery where it runs close to the surface of the skin on the inside of your arm at the elbow and proceed to inflate the cuff.

As the cuff is inflated it tightens around the arm preventing blood from flowing through the brachial artery. The pressure in the cuff, which is indicated by a mercury manometer attached to the cuff, is slowly released and the point at which blood starts flowing through the artery, and which the doctor hears as a "whoosing" sound through his stethoscope, is noted. This is the point at which the pressure in the cuff equals the pressure in the artery as the heart pumps blood through it and is known as the systolic pressure.

The doctor then continues to slowly release the pressure in the cuff and to monitor the sound of blood being pumped through the artery until no sound at all is detected. At this point the manometer indicates the pressure in the artery as the heart is at rest and refilling ready to pump again. This lower pressure is known as the diastolic pressure.

Blood pressure will vary from person to person and will also rise and fall within each of us depending on a variety of factors such as the time of day, our level of activity, whether we are feeling stressed, our general state of health and whether or not we are currently taking particular forms of medication.

For the average person at rest however systolic blood pressure will be around 120 mm Hg (millimeters of mercury) and diastolic blood pressure will be 80 mm Hg. As an indication of the degree of variation between individuals, and within any one person, the normal range of systolic pressure is considered to be 90 – 135 mm Hg and the normal range of diastolic pressure is 50 – 90 mm Hg.

If your blood pressure falls outside these readings, then your doctor will need to investigate further to discover why your blood pressure in either unusually high or unusually low.

Since most of us do not visit the doctor on a regular basis, and only venture into the surgery when we absolutely have to, it can often be many months, or even years, between blood pressure checks and we could well be walking around blissfully unaware that we have a time bomb ticking away inside us.

Today however there is a whole range of very simple to operate and relatively inexpensive blood pressure monitors available for use in our own homes and absolutely no reason at all for not keeping a regular eye on our most valuable organ.

So, before tragedy strikes either you or one of your loved ones, why not take a few minutes to check out the range of blood pressure monitors available and buy yourself some peace of mind.

Finding a source of primitive stem cells.

There are news reports about the positive impact that research on cord blood stem cells is having on the possible cure for numerous life threatening diseases. But with so many varying reports about it or even factions it is impossible to keep track of all its useful facts. Stem cells show a great level of plasticity which means they can generate and regenerate into many different types of cells and even organs within in our body. Potentially, if they can be removed from the donor and transfused into the patient then in the future, stem cells could be used to cure virtually any illness.

Stem cells are more frequently found in babies or even in embryos although it has been discovered that adult stem cells do exist. To date these have mostly been found in the brain but are dispersed freely amongst millions of other cells making the extraction incredibly difficult.

Cord blood stem cells, on the other hand, are very easy to remove. Because the process is completed after the child has been born and the umbilical cord cut and clamped there is no effect whatsoever on the baby, the parent or the birth itself.

How stem cells become T cells.

T cells are the cells that are responsible for fighting infection in children and are created when stem cells pass through the thymus gland. If the patient does not have an adequate number of effective stem cells in their blood then they will not be able to create the T cells. And subsequently they are much more likely to suffer serious infections. This, in turn, means that cord blood stem cells can be used to recreate T cells as well as other vital cells within the body of your child. The stem cells will then create an army of T cells to fight off infection and leave the body to function in a normal manner. As with a blood transfusion it is imperative to the operation's success that the stem cells transfused are of the same type as the patient's own blood. Using cord blood stem cells belonging to the patient themselves all but guarantees that this will be the case.

Stem cell testing.

The umbilical cord stem cell matrix is called Wharton's jelly and is rich in primitive stem cells. These cells are one that has yet to progress, transform or produce other cells. Primitive stem cells are the most effective type of stem cells that can be used in a transfusion on any patient.

Typically a lot of testing has been done on animals to prove the viability of using stem cells taken from cord blood of newborn babies and amongst the most prominent of these tests, according to the online journal "stem cells", have been tests carried out on pigs. In a human blood cord, similar to a pig umbilical cord, two arteries & vein are found and tests have shown positive results concerned with the storage and potency of the blood. The journal "stem cells" contains a lot of data relating to stem cells and articles on various related topics.

At present leukemia and anemia are the two most common diseases treated with stem cell transfusions although since stem cell research has grown in volume and results diseases such as Parkinson's, Multiple Sclerosis and many different forms of cancer are also showing positive results.

The only way of constantly keeping track of your blood pressure is with the help of a blood pressure monitor. But be careful if you are going to acquire one because there are many types and models of blood pressure monitors available so you have to find the ones that suit you best.


When suffering from high blood pressure it is very important to monitor how the values of your blood pressure change during the day. This way you will have an active role in taking care of your own health and it will be very easy to determine what kind of treatment you need.

The price of a digital blood pressure monitor is not too elevated and they are quite easy to use too. When you've just bought one the best thing to do is to pay a visit to your doctor and he should be able to instruct you on how to use the blood pressure monitor. It is important to do this because otherwise you may perform innaccurate measurements and this should be avoided.

You must also take into account the fact the values of the blood pressure vary at everyone, so do not be frightened if a few of your readings are a bit over the line, this is normal for everybody. You should only worry if these high values keep repeating, and in this case you should contact your doctor as soon as possible.
Also, the values of the readings that you make with the blood pressure monitors may be lower than usual a few times, which is also normal.
If you want the readings to be as accurate as possible try to sit down, rested, on a hard surface when performing the measurements.

Finally do not forget that the purpose of measuring your blood pressure at home is is to reduce it!

By atherosclerosis the inside of the arteries are thickened, hardened and stiffened, causing the space for blood flow to be narrowed or closed. This will decrease the oxygen supply to local or distant tissues.

The primary symptom of this is pain, poor organ function and bad general condition. The further consequences are tissue damage, sometimes acute damage because by stop of blood flow caused by a sudden blood clot formed in the narrowed areas.

 
THE MECHANISMS AND CAUSES OF ATHEROSCLEROSIS

The inner walls of the arteries consist of an innermost layer of endothelial cells (surface cells) and under these a layer of smooth muscle cells. The changes by atherosclerosis take place under the endothelial cells and in this muscle layer. The changes consist of: A certain degree of cell proliferation or tumour, gathering of cholesterol and fat. Deposition of calcium salts. Deposition of blood elements like fibrin.

The deposits are called atherosclerotic plaque or atheroma. Atherosclerosis is one of several types of artery thickening and hardening. A common name for thickening and hardening of arteries is "arteriosclerosis". Often atherosclerosis is also just called arteriosclerosis.

The development of atherosclerosis probably begins by a damage in the endothelium. This damage causes cholesterol and fat to penetrate into the vessel walls and deposit there. This also induces cells to proliferate. Later also calcium salts are deposited.

Factors that cause endothelial damage and thus atherosclerosis are:
-High content of cholesterol in the blood.
-High content of blood fat and especially saturated fat.
-Inflammation in the blood vessels. A sign of such inflammation is the presence of a substance called c-reactive protein.
-High amount of oxidation agents in the blood.
-High blood pressure.
-High content of low density lipoprotein (LDL) in the blood serum, and low content of high density lipoprotein (HDL) in the blood. Lipoprotein is a combination of a protein molecule and fat or cholesterol. Lipoproteins carry cholesterol or fat from place to place.
-Diabetes.
-High age.
-Smoking.
-Men have a somewhat higher chance of getting this condition than women.
-High content of the amino acid homocystein in the blood serum.

Many of these factors are ultimately caused by a bad diet and lack of daily exercise.

 
THE SYMPTOMS AND CONSEQUENCES OF ATHEROSCLEROSIS

Since atherosclerosis can affect all body parts, the symptoms will vary. However, general symptoms from the affected body parts are:
-Decreased performance, easy to tire out.
-Pain by physical activity, so called anoxic pain.
-By severe impairment of blood flow, tissue damage or sores can occur.

When the heart is affected, the symptoms will be:
-General bad condition.
-Anoxic pain from the heart and surroundings by physical activity, called angina pectoris.
-Feeling of not getting enough air, or breathing problems.

Atherosclerosis can cause blood clots that close the blood flow. There are several ways this can occur:

-The atherosclerotic plaque can rupture, making a sore in the inner wall of the vessel. At such a sore blood can coagulate, making a blood clot.
-The atherosclerotic plaque itself can grow to close a blood vessel.
-Blood coagulated at an affected area can tear loose, float with the blood stream to another place and prop a blood vessel at the new place.
-A portion of the plaque itself can tear itself loose and clog another blood vessel.

When the heart is stricken by a blood clot, heart tissue is suddenly destroyed, a condition called heart infarction, causing sudden heart failure or death.

When a blood clot strikes the brain, brain tissue is destroyed or impaired, causing paralysis, decreased consciousness, coma or other sudden functional impairments.

 
THE PREVENTION AND TREATMENT OF ATHEROSCLEROSIS

Atherosclerosis can be prevented and to some extend be cured by these measures, of which most are lifestyle adjustments:

-Eating just a little or moderate amount of fat.
-Eating just a moderate amount of sugar.
-The fat eaten should be a blending of different types of unsaturated fat from sources like: Olive oil, rape oil, sunflower oil, soy oil, walnut oil and fish. Then you will get enough of mono-unsaturated fat, omega-3-unsaturated fat, and omega-6-poly-unsaturated fat, but not too much of any of them.
-Eating much fish and just a little red meat.
-Eating a good amount of fruit and vegetables each day.
-Supply of enough vitamins, minerals and anti-oxidants.
-Only consuming moderate amount of salt.
-Stop smoking.
-Getting high blood pressure treated if lifestyle measures do not bring blood pressure down.
-Daily exercise fitted for one's own condition.
-Eliminate stress in the daily life and at the job.
-Stressing down and getting enough rest.

By high cholesterol levels that do not react properly to lifestyle measures, cholesterol lowering medication can be used, such as HMG-CoA reductase inhibitors.

By serious local narrowing of an artery, surgery to clean out or widen the artery is sometimes performed. Sometimes the artery is replaced by a graft taken from another body part or by an artificial vessel. When this is done in the heart, it is denoted as bypass surgery.

Alternative treatment to clean out the arteries is an option. There is for example a treatment consisting of using the substance EDTA to carry constituents of plaque away from the arteries. The molecules of this substance have the ability to grip around other molecules, for example cholesterol molecules, and carry them away. There is however a controversy about the effectiveness of this treatment, called chelating therapy.

Heart attacks come in all sizes, from minor to major, and the symptoms of a pending heart attack can be deceiving in many cases. Some symptoms of a pending heart attack may have been showing up for quite awhile and were ignored as something else.

Pending heart attack symptoms mask themselves as indigestion, being overworked and tired all the time, and taking naps several times a day.

During a real heart attack, you may feel feverish, have a nauseous sick feeling, shortness of breath, labored breathing, sweating, tingling in arms, chest pain, heaviness in the chest area like someone is pushing on your chest and various other indications.

Your life may depend on you making the right decision within minutes, is what you are feeling a heart attack... as a quick response time in calling for help... 911... could be the determining factor that saves your life. Its better to be wrong, than to be right and not get help on the way ASAP!

One of the major causes of a heart attack is the restriction of blood flow to the heart muscle, which causes any number of symptoms. But the bottom line is, how severe is your heart attack. That will in many ways determine what symptoms you experience. The more severy the blockage, the more severe the heart attack symptoms in most cases. The blockage may occure due to a blood clot, or material buildup inside the artery walls that breaks loose.

Many hospitals are not fully equipted to deal with heart attack victims, and will transfer the patient by air to a hospital or medical center with a heart attack specialist who can determine how bad it was, and one who has the skill to repair the damage caused by the heart attack.

The quicker the blood flow to the heart muscle is restored, the better your chance for a complete recovery from your heart attack.

Heart disease is one of the leading causes of death in most developed countries around the world, and the number of cases is rising constantly as a result of both modern lifestyles and increased overall longevity. While developing the condition can have a devastating impact on the sufferer's life, modern medicine has developed several effective treatments for heart disease, ranging from drugs and lifestyle improvements right through to surgery.

Of course, prevention is always better than cure, so before we look at some of the symptoms of cardiac disease we'll look at some of the ways you can help your body ward off the risks.

Living a healthy lifestyle can go a long way to reducing the chances of developing cardiac problems, but there is unfortunately an element of inherited risk, so even those with excellent overall health may find that they're genetically programmed towards heart disease in later life. Thankfully, the greatest influence genetics has on heart disease is that of making us more susceptible to certain causes, and with careful adjustments of our lifestyles we can greatly improve our prospects of avoiding it.

The two most deadly contributors to cardiac problems are smoking and obesity. Both of these can raise blood pressure to dangerous levels, putting extra strain on the heart. Smoking causes the build up of fatty deposits within the arteries, also causing circulation problems. Being overweight also tends to mean that a healthy diet is not being followed, and so the body may well be short of essential minerals and nutriments that the heart needs to keep on functioning healthily.

Stopping smoking and other unhealthy practices such as excessive drinking, along with improving diet and taking up exercise to reduce weight can go a long way towards averting problems.

The symptoms of a developing heart problem can be both subtle and dramatic. Unfortunately, many of the symptoms can also signify other less dangerous conditions, and so a diagnosis of heart disease is often made later than it could have been. If you come across more than one of the symptoms below, then a trip to your doctor is highly advisable.

Breathlessness when engaged in physical exercise is normal to some extent for almost everyone, but if you find you're becoming breathless more and more easily then this is a clear sign that your general fitness levels aren't all they could be, and that your heart may be struggling under the pressure.

Palpitations, that is a heavily or unevenly beating heart, can be a sign of anxiety or can come on after extreme exercise, but if neither of these situations apply then heart problems could well be the culprit.

A tingling feeling in bodily extremities such as fingers, toes or lips is often a sign that your cirulation system isn't delivering enough oxygen, again a sign of possible heart problems. Should your extremeities go on to develop a blueish colour then this is certainly not a good sign, and medical attention should be sought at once.

The final and most obvious sign of cardiac problems is a feeling of tightness or pain in the chest, a condition known as angina. If you feel chest pain with any regularity, even if not particularly severely, a medical check up is advisable to make sure you catch any problems as early as possible. Angina can be controlled very well by medication in many cases, and doesn't necessarily have to develop into full-blown heart disease.

In summary, living a healthy lifestyle while keeping an eye out for the symptoms will greatly reduce the risk of your life being devastated by heart disease.