When doing bicep curls, the first rep is relatively easy but eventually it becomes impossible to do a single curl.
After a rest, the muscle resets and can once again lift.
What is causing the muscle exhaustion and what is it that “resets” within the muscle?
In: 85
The simplest answer is that your muscles run out of energy.
Human cells store energy in ATP, which is a complext protein that has three phosphates squeezed together like a spring. When you excercise you run through ATP faster than your body can replace it and when it’s all gone the muscles simply can’t move. Thankfully, ATP can be easily replaced so long as your body has sugar and oxygen to burn.
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