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iRun because it reminds me that I am capable of so much more than I have doneJames Sauve , Ottawa, ON

iRun for meKiza Francis , Ottawa,ON

iRun to prove to myself I canLesley McGougan , Brampton, ON

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iRun because when I run I feel most aliveMeghan Lynch , Ottawa, ON

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iRun because I need it to soothe the soul, keep me in shape and for overall wellbeingBeth Neil , Lombardy, ON


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Toronto Marathon
October 19, 2008

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Web Extra: Do Caffeine & Running Mix?

Caffeine & Running - Do They Mix?: Sports nutrionist Beth Mansfield investigates

How many of us need a morning java jolt to get up and go each day?

Small to moderate amounts (50-300 mg) of caffeine act as a mild central nervous system stimulant by increasing the heart rate and blood pressure - so it provides an initial boost of energy, keeping us alert and preventing fatigue. Athletes have taken advantage of this energy-boosting effect of caffeine for years - to the point that caffeine's well-recognized stimulant effects once landed it on the list of banned drugs. In 2004, however, caffeine was removed from the World Anti-Doping Agency's list of banned substances. This begs the question - is it really worth using?

While the amount of caffeine in a cup of brewed coffee may have some favourable impact on your reaction time, it will do little to improve running performance. Athletes should also consider that excessive caffeine intake, or the sudden use of caffeine by those that never use it, can lead to a number of pitfalls: the shakes; anxiety; an upset tummy; insomnia and heart arrhythmias. Also, caffeine has a diuretic effect, which could affect your pre-training or pre-competition hydration status by making you urinate a little more than you normally would.

Although a moderate amount of caffeine per day, approximately 300 milligrams, is relatively harmless for most people, some individuals may be sensitive to the effects of caffeine at very small doses, and pregnancy and aging (beware masters athletes!) can affect this sensitivity. Runners should also be aware that the helpful effects of caffeine vary and do not occur consistently in habitual users, suggesting that we become less sensitive to caffeine's effects. It may be a pre-competition strategy to hold off on those two to three morning cups of java the week preceding your longest race, allowing you to reap the optimal benefits when you supplement your pre-race meal with some caffeinated fluids. Then during exercise, keep your hydration status topped up with consistent intake of fluids such as water and sports drinks.

Caffeine Content of Popular Foods and Beverages
  Typical Range
Coffee, 250 mL*    
    Brewed, drip method 85 65-120
    Instant 75 65-85
Red Bull Drink 80 80
Espresso, 30 mL 40 30-50
Caffeinated soft drinks 24 20-40
Brewed black tea, 250 mL 40 20-90
Iced tea 25 9-50
Chocolate milk 5 2-7
Milk Chocolate (30 g) 6 1-15
Dark Chocolate (30g) 20 5-35
Cocoa beverage 6 3-32

* the amount of caffeine varies based on the type of coffee and method of preparation. Data from the International Food Information Council Foundation, October 1999

 
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