hitting the wall

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The depletion of glycogen stores in the liver and muscles, which manifests itself by abrupt fatigue and loss of energy

hit·ting the wall

(hit'ing wawl)
A term athletes use to describe an abrupt decline in the ability to maintain the desired intensity of endurance exercise performance; associated with accumulation of blood lactate and depletion of liver and muscle glycogen reserves.
See also: fatigue
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References in periodicals archive ?
Rapoport's model also allows runners to calculate how much carbohydrate they need to consume during the race if they want to run a faster pace without hitting the wall.
So, if you want to experience hitting the wall, go too fast, don't drink enough, or wait for a really hot summer's day
If you're burned out or hitting the wall and get mid-afternoon slumps, try a daytime nap.
Recognise it for what it is: Hitting the wall means that your get up and go has got up and gone, temporarily.
In circumstances still under investigation, the car veered towards the right, hitting the wall of a house.
Interestingly, external dissociation seems not to lead runners into the trap of hitting the Wall, as you might expect from the results of internal dissociation.