All Blood Tests

If you watch a major bike race on TV, you have to be impressed by how the riders can eat enough to sustain them through races that require more than five hours of near maximum effort. If they don’t get enough food during their ride, they are able to fall off their bikes, lie on the ground unconscious and start to shake all over in a in a massive convulsion. This is called bonking: passing out from low blood sugar.

Your brain gets almost all of its fuel from sugar in your blood stream. When your blood sugar level drops, your brain cannot get enough fuel to function properly, you feel tired and confused and can pass out. There’s only enough sugar in your blood stream to last three minutes. To keep your blood sugar level from dropping, your liver must constantly release sugar from its cells into your blood stream, but there is only enough sugar in your liver to last 12 hours at rest. During intense exercise, your muscles draw sugar from your blood stream at a rapid rate. Your liver can run out of its stored sugar and your blood sugar level can drop, and you bonk.

Bonking is common in bicycle races if a rider does not eat frequently, but is rare in long distance running races. When you run, your leg muscles are damaged from the constant pounding on the roads and you have to slow down. However, you pedal in a smooth rotary motion which does not damage your muscles, so you are able to continue to pedal at a rapid cadence for many hours.

To prevent your blood sugar from dropping too low during intense exercise lasting more than two hours, eat at least every 15 minutes. It doesn’t matter what you eat: salted peanuts, a peanut butter and jelly sandwich, chicken, an apple, a banana or anything else. Nearly all fit people can take small amounts of food frequently during exercise without developing stomach cramps.