Noakes repeated similar versions of this experiment and observed the same result. Although participants reported being totally depleted and unable to contract their muscles after exercising to what they thought was failure, when electrical stimulation was applied, without fail, their muscles produced additional force. This led Noakes to conclude that contrary to popular belief, physical fatigue occurs not in the body, but in the brain. It’s not that our muscles wear out; rather, it is our brain that shuts them down when they still have a few more percentage points to give. Noakes speculates
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