Most people think about hydration as something to catch up on after a workout. The research says the opposite, pre-workout is the more critical window, and arriving at exercise already electrolyte-sufficient changes how your body performs and recovers. For migraineurs, the stakes are higher: exercise accelerates sodium loss through multiple pathways simultaneously, and the drop in extracellular sodium that follows a poorly hydrated workout can push the nervous system toward its threshold.
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