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Fitness Nutrition and Hydration

Staying Fueled During Exercise


Author:

Fran Grossman, R.D., M.S., C.D.E., C.D.N

The Mount Sinai Medical Center, New York

Medically Reviewed On: November 14, 2001

Good nutrition is essential for optimal health and top performance during any physical activity. Exercise, whether intensive or mild, increases both fluid and nutrient requirements. Incorporating the right foods and beverages prior to all exercise is essential for peak performance, whether for a brisk walk, heavy workout, or a competition. Nutrition expert Fran Grossman offers athletes nutritional strategies for staying in the game.

Hydration
During exercise, we sweat due to an increase in heat production. Water or other fluids serve to cool down our body. If we do not replace fluids fast enough to offset the fluids lost through perspiration, we will become dehydrated.

Dehydration will result in decreased performance, and if not resolved in a timely manner, could result in a host of medical problems. Those engaging in exercise or competition-from the weekend warrior to the competitive athlete, cannot depend on thirst for fluid replacement and should, therefore, force themselves to drink even if they're not thirsty.

Commercial sports beverages that contain electrolytes may enhance absorption and will also provide a carbohydrate source. Cold water will also be absorbed more rapidly and will decrease body temperature.

It is recommended to use a sports beverage in an extended competition such as a marathon or vigorous workout that lasts for more than one hour. Water is fine for shorter competitions or workouts. Each pound of weight loss requires two eight-ounce glasses of water for replacement. The American College of Sports Medicine makes the following recommendations on fluid replacement:

  • Drink prior to working out. Take in 16 to 20 ounces of fluid (water or sports drink) one to two hours prior to activity.
  • Drink twelve ounces of fluid every 15 to 20 minutes of exercise. If working out for more than one hour, choose a sports drink. After you finish an activity, drink two cups of fluid for every pound lost during your workout. A sports drink offers the added benefit of rebuilding diminished stores of glycogen.
Pre-Workout or Competition
Research shows that proper food and fluid intake prior to working out or engaging in a competition will improve endurance. Results also show that athletes who eat prior to exercise feel better and find the activity less rigorous than those who choose to fast.

The athlete who risks eating and drinking too close to a competition or workout may suffer from gastrointestinal distress such as nausea and cramping.

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