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Lead Stories: Saturday, September 6, 2008

Q&A: Does caffeine really improve athletic performance, or do you just feel more alert?

Posted January 24th, 2008 at 10:15 AM by Jeremy Sussman

Section: Nutrition, Supplements, Health & Fitness, Exercise

In endurance events, the first cause of fatigue is loss of muscle sugar, so athletes do whatever they can to preserve sugar levels. Caffeine causes the body to produce large amounts of adrenalin, which causes fat to be released from fat cells and float in the bloodstream.

This extra fat is taken up by the muscles and used for energy, thus preserving the body’s limited stored supply of muscle sugar. When muscles run our of sugar, the athlete requires more oxygen to do the same job, slows down, fatigues earlier, and has difficulty maintaining his performance.
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Preserve muscle sugar for speed and endurance

Posted August 2nd, 2007 at 1:00 PM by Martha Jones

Section: Nutrition, Healthy Eating, Hydration, Race Prep & Recov, Health & Fitness, Exercise

How fast you can move and how long you can exercise intensely depends on the amount of sugar (glycogen) stored in your muscles. The same rule applies in all sports: when muscles run out of their stored sugar supply, they require more oxygen and you have to slow down.

Fluid is less important than muscle sugar because dehydration will not cause you to slow down until your blood volume is reduced. As you lose fluid from sweating, interstitial fluid stored around cells is released into the blood to maintain blood volume. When you compete is sports at a very high intensity, your muscles run out for stored sugar long before your blood volume is reduced, and you slow down from lack of muscle sugar before you slow down from reduced blood volume (Sports Medicine, April- May 2007).
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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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