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Why is fluid intake important?

Dr. Vonda Wright, MD
Orthopedic Surgery
The adult body is 50 -- 70 percent water. The leaner you are, the greater your percent water since muscle contains more than 80 percent water while fat has less than 30 percent. Disturbances in water and electrolyte balance affect us at all levels from systemic to cellular and prevent our ability to continue exercising.

Hot and dry will hurt you. Even modest dehydration (less than 2 percent fluid loss) can affect athletic performance. When you are dehydrated, you sweat at a slower rate and therefore cannot cool your body as effectively. Overheating impairs cardiovascular function and strains the heart. As you lose water, there is a linear rise in core body temperature with every one liter of water loss resulting in an increase of 0.3 degrees Celsius.

Age-related changes amplify this effect. With age, we have an altered thirst mechanism. Our kidneys can become less efficient, we waste more water, and our blood vessels are less flexible and dilate less. When this happens to our blood vessels, it reduces our ability to release heat through the skin.
Fitness After 40: How to Stay Strong at Any Age

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Fitness After 40: How to Stay Strong at Any Age

It's one of the undeniable facts of life. After we reach a certain age, our bodies change. No matter how fit we may have been at 20, we're very different people after 40. But growing older doesn't...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.