Whatever Makes You Sweat
All athletes will experience some level of electrolyte loss and dehydration. The extent of this loss depends on the type of physical activity, but more importantly the rate of sweat. The average football player sweats anywhere between 1.3% – 4% of body weight each game, and represents a high loss of electrolytes.
Like how your body triggers a temperature controlling sweat response during exercise, travelling in hot humid climates will make you sweat and lead to electrolyte imbalance as your body attempts to cool down. Cabin dehydration on long haul flights causes electrolyte loss, but not necessarily through sweat. The low humidity of an aircraft draws moisture and electrolytes from your lungs, eyes, and nose as well as your skin.
Dehydration and electrolyte imbalance are both symptoms associated with stomach bugs. Diarrhoea and vomiting lead to large fluid and electrolyte losses, that if left untreated, can lead to symptoms of severe dehydration and require medical attention. After a heavy night your electrolyte balance will also need to be corrected.