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Lead Stories: Friday, August 29, 2008

Impact of extreme weather conditions on marathon running performances

Posted May 23rd, 2007 at 1:00 PM by Megan Hueter

Section: Running & Training, Injury & Rehab, Training Tips

In general, marathon races are among the most physiologically demanding endurance events in the world with runners competing for a distance of 42 kilometers (26.2 miles). (3,6) Competitive marathon runners often maintain a pace equaling 70-90% of their VO2max (max output) for over two hours. (6) Both biological and environmental factors affect the thermoregulatory balance in marathon runners.

Marathon races are considered mass participation events, and heat injuries occur in less extreme conditions. When running in closer proximity to other runners, it has been reported that the physiological heat stress is three times more straining on the body compared to someone running solo in identical weather conditions. (6) As mentioned earlier biological and environmental factors play a role in maintaining thermoregulatory balance in marathon runners. Biological factors such as dehydration, metabolic rate and gender limit thermoregulatory control. (3)
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Does your heart get tired when running and/or during other types of exercise?

Posted March 26th, 2007 at 9:59 AM by Hariz Siddiqui

Section: Health & Fitness, Exercise

A healthy heart is so strong that it is almost never a cause of tiredness during exercise.

Tiredness during exercise comes from your muscles. They run out of fuel or out of oxygen. Skeletal muscles use both fat and sugar for energy.

When your muscles run out of their stored sugar supply, called glycogen, they cannot contract and function adequately. You feel tired, your muscles hurt and you have difficulty coordinating them.

On the other hand, your heart muscle gets energy directly from fat and sugar in your blood and even from a breakdown product of metabolism called lactic acid. It is virtually impossible for the heart muscle to run out of fuel unless you are starving to death.
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Does cycling cause impotence?

Posted March 2nd, 2007 at 10:18 AM by Martin Kennedy

Section: Running & Training, Cross Training, Health & Fitness, Injury & Rehab

The greatest source of discomfort for cyclists is the nose of their bike seat pressing on nerves and soft tissues. For men, this pain brings the additional worry of impotence. Impotence is caused by nerve and artery damage. Exercising regularly helps to keep arteries healthy, so bicycling helps prevent impotence, as long as it does not damage the local arteries and nerves.

Recent studies show that three percent of regular male bicycle riders become impotent, and virtually all of them felt pain or numbness before the problem occurred. When a nerve is pinched or the blood supply is shut off to the penis, a man feels numb.

Men who ride with conventional bicycle seats and do not feel numb are not likely to be at risk. If you feel no discomfort when you ride, keep on riding and stop worrying. If you feel numbness, get a new seat.
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Why you should cool down

Posted February 20th, 2007 at 8:00 AM by Martha Jones

Section: Running & Training, Injury & Rehab, Health & Fitness, Injury & Rehab, Exercise

At the end of a marathon, a runner sprints over the finish line, falls down and lies unconscious for a short time. What’s the most likely cause? The possibilities include dehydration, hyponatremia (excessive fluid intake with too little salt in the blood), heat stroke, drunkenness, a heart attack or stroke. Usually it is none of these.

Almost all athletes who collapse after finishing a marathon suffer from postural hypotension: lack of blood flow to the brain because blood drops from the brain to the legs.

Treatment is to lie the person on his back, raise his feet high over his head and wait for him to revive. If he or she is not alert within seconds, you should consider the more serious causes of unconsciousness and get medical help immediately.
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Active and Dynamic Stretching: An injury prevention tandem

Posted January 16th, 2007 at 4:24 PM by Richard Quinn

Section: Running & Training, Injury & Rehab, Health & Fitness, Injury & Rehab, Exercise

Stretching before and after running (and any physical activity) is an important aspect of preventing injuries. Stretching can also help with muscle recovery, optimizing muscle gains and increasing flexibility. There are two general types of stretching that can lead to these benefits: active and dynamic.

Active stretching (as seen above), also known as static stretching, entails stretching a muscle to an elongated position and holding that stretch for a certain amount of time. This is the most common type of stretching that most of us have been taught from a young age. Although there is some debate about the effective of active stretching, Sports Fitness Advisor states:

“This debate relates to an acute bout of static stretching prior to exercise. It is still considered important and beneficial to athletes away from competition to to bring about a long-term increase in range of motion.”

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How to Warm Up

Posted October 22nd, 2006 at 5:56 PM by Martin Kennedy

Section: Running & Training, Injury & Rehab, Training Tips, Health & Fitness, Exercise

legs, edit2.jpg Warming up before you exercise helps to prevent injuries and lets you jump higher, run faster, lift heavier or throw further. Your warm-up should involve the same muscles and motions you plan to use in your sport.

For example, before you start to run very fast, do a series of runs of gradually-increasing intensity to increase the circulation of blood to the muscles you will be using.

Muscles are made up of millions of individual fibers, just like a rope made from many threads. When you start to exercise at a very slow pace, you increase the blood flow to muscle fibers, increase their temperature, and bring in more oxygen, so the muscles are more pliable and resistant to injury.

When you contract a muscle for the first time, you use less than one percent of your muscle fibers. The second time you bring in more fibers, and you keep on increasing the number of muscle fibers used in each contraction for several minutes of using that muscle.

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