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Lead Stories: Monday, December 1, 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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What’s the proper way to do sit-ups?

Posted November 8th, 2006 at 4:00 AM by Hariz Siddiqui

Section: Health & Fitness, Exercise

Sit-ups can strengthen your belly muscles, but doing them incorrectly can hurt your back.

Sit-ups should be done while you lie on your back with your knees bent enough for the soles of your feet to touch the floor. Place both hands on your chest and slowly raise your head off the ground. Raise your shoulders about one foot and then lower them to the ground. Do this slowly ten times, rest a few seconds and then do two more sets of ten.

After a week or two this exercise will feel easy, so add a light weight held on your chest. As you become stronger, you can use heavier weights [and/or include more complex variations of the exercise]. Read the rest of this entry »

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