What happens to the EMG signal when the muscle begins to fatigue (if the person is still trying to squeeze the dynamometer)? Why?
A) The EMG signal increases because the muscle is working harder to maintain the same force output.
B) The EMG signal decreases because the muscle is no longer able to generate as much force.
C) The EMG signal remains constant because fatigue does not affect muscle activation.
D) The EMG signal fluctuates but eventually stabilizes as the muscle adapts to the fatigue.