Why do my stomach muscles quiver visibly after doing a difficult core workout?
1. Introduction Visible quivering in the stomach muscles after a rigorous core workout is caused by acute motor unit fatigue and localized neuromuscular hyper-excitability. The substantial physical demand depletes cellular energy stores and alters the electrochemical balance within the rectus abdominis fibers, causing individual motor units to fire spontaneously. Ensuring adequate recovery, hydration, and electrolyte … Read more