I've bonked really 'good' (oxymoron) a few times and if anything you can't even turn the pedals over hard enough to get your heart rate to go up.
When you bonk you get super hungry... I mean a hunger like you've never felt in your life and think irrational thoughts like.. "grass is edible... cow's eat it, why can't I?"... the only thing that stopped me was the thought of the insecticides that must be on it... or you suddenly find yourself in a corn field or apple orchard helping yourself to produce right off the stalk or tree.. funny how good imature, raw corn tastes when you've totally bonked..
bonking is a survival method when your bodys gylcogen level gets too low... your brain can only use glycogen as an energy source so once it gets to a certain level your brain says ok all the rest is for me... so all your muscles can do is get energy aerobically... so all you can do is tip-toe on the pedal and not enough to raise your HR past a active recovery sort of level.
Bonkings not fun... eat when your ride over 1.5 hrs.
Edit: it may be dehydration, exhaustion or you'll get elevated HR if you take a even 1-2 days off before a ride.. your body will adjust your stroke volume even in that short a time... less L/heart beat means more beats per minute to move the same amount of blood...
Last edited by doctorSpoc; 01-25-06 at 12:29 PM.