There are two types of bonking. The first (and most common) is when
muscle glycogen is depleted. When this happens, you can still ride, and
may even feel quite good. As long as the going's easy. Flat roads, tail
winds and such. As long as all you need is an aerobic effort, which
relies on oxygen and blood sugar. This can be replenished through energy
drinks, bars, fruits, etc.
But as soon as any real strength is needed, like climbing a hill,
there's nothing there. You feel like someone has turned off a switch.
This type of effort is ANaerobic. It doesn't use oxygen. It comes into
play when the needs of your muscles are exceeded by what your heart and
lungs can supply. This type of effort uses stored energy. Glycogen,
which you are now out of. It can take up to a day or so for your body to
replenish it's stores.
The second type is when you really "hit the wall". This is when not only
have you depleted the bodies's stores of glycogen, but you have been
unable to (or just haven't) kept up you intake of carbohydrates to
maintain you blood sugar levels.
When this happens, you totally run out of power. And the body will shut
down muscular activity in order to maintain basic life functions. This
can be accompanied (besides the complete inability to move) by dizziness
and incoherence. and can become serious if too extreme. The pictures
you've seen of marathon runners who simply collapse and can't get up
without help, they have reached this level.
I've reached the first level of bonking many times, especially when
training for an endurance ride, pushing myself more than I should. it's
frustrating, but with my super low gears, not incapacitating. I can
still limp home, albeit at a newbie's pace. I've been lucky so far,
usually when it happens it's not until the last ten miles or so.
I've never let myself get to the second level.
- -
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"Your Friendly Neighborhood Wheelman"
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