yes any strenuous exercise for a long period will deplete your bodies electrolytes and should be replaced.
electrolyte replacement during extended exercise. what's the best way to replace fluids electrolytes and energy during 2 to 4 hours exercise sessions. i often take bike xc ski trips or hikes in the woods that last a while. for longer trips i always stop to eat a meal. is it best to eat small snacks along the way mixed with water? what about sports drinks that contain sugar?