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Dehydration occurs when water intake is insufficient to replace free water lost due to normal physiologic processes (e.g. breathing or urination) and other causes (e.g. diarrhea or vomiting). Hypovolemia is a related condition specifically meaning a decrease in volume of blood plasma— not of total body water. Both (total body water and plasma volume) are regulated through independent mechanisms in humans [1] and should not be conflated. Some authors have reported three types of dehydration based on serum sodium levels: hypotonic or hyponatremic (referring to this as primarily a loss of electrolytes, sodium in particular), hypertonic or hypernatremic (referring to this as primarily a loss of water), and isotonic or isonatremic (referring to this as equal loss of water and electrolytes).
What is rehydration?
Ergogenic aids - legal: re-hydration Re-hydration A simple but effective aid to performance, pre and post, is to ensure that adequate fluid levels are maintained. In hot and humid conditions fluid loss can be as much as 2 litres/hour. Insufficient fluid intake can lead to heat stress, heat exhaustion, heat stroke or organ failure, organ meltdown, muscle melt down, even in extreme cases death! You should always drink before you feel thirsty. The following rates of fluid consumption are recommended. 300-50ml of fluid half an hour before the activity 150-250ml at regular intervals throughout the activity re-hydrate at the end of training or competing
What is dehydration.