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Answer:
A. 2
Explanation:
More than 2 hours of continuous exercise typically marks the transition when the use of fluids that contain sodium and carbohydrate becomes necessary and appropriate.
- It is possible for athletes engaged in prolonged moderate- to high-intensity exercise in hot environments to sustain sweat rates of 1 L to over 2 L per hour, resulting in substantial sodium loss (∼1.5 to 3.0 g per hour) - In such cases, sodium replacement should begin during exercise by consuming fluids containing sodium, salt supplement products, or eating salty-tasting foods. - The addition of sodium may also encourage greater voluntary drinking and may aid in the uptake of water from the small intestine.