April 14th, 2008

by Lisa Sabin

Top 10 Hydration Tips From Gatorade and BAA Web-site

1. Know Your Sweat Rate and Follow Your Own Hydration Plan - Everyone sweats at their own rate, so don’t copy what others are doing. To figure out your personal sweat rate, weigh yourself before and after training and competition with the goal to weigh the same before and after exercise. If you lost weight, drink more next time. If you gained weight, cut back on your fluids. Sweat rates can vary depending on environmental conditions, so be sure to calculate your sweat rate in various conditions.

2. Experiment with Hydration and Fueling Early in Your Training - Find out what will be offered on course and consider training with it. By the time you get to your competition, you’ll know what works best for you and what to avoid.

3. Check the Color of Your Urine - An easy way to tell if you’re properly hydrated is to check the color of your urine. If your urine is pale like lemonade, that’s a sign of good hydration. Crystal-clear urine often indicates over-hydration and the need to cut back. Dark urine (like the color of apple juice) may signal dehydration and the need to drink more.

4. Choose the Right Beverage - When training for an endurance event like a marathon, your beverage choice matters. Water can actually turn off the thirst mechanism too quickly, making it harder to stay hydrated over the long haul. Instead, look for a beverage with electrolytes and carbohydrate to help replace the electrolytes you lose in sweat, promote rapid absorption, and supply energy.

5. Don’t Over-Drink During Training or Competition - Whatever your beverage preference is, it’s essential not to over-drink. Over-hydrating can lead to a dangerous condition called hyponatremia. The risk of hyponatremia can be reduced by making certain your fluid intake does not exceed your sweat loss and by ingesting sodium-containing beverages or foods to help replace the sodium lost in sweat.

6. Fuel Pre-Competition and During Competition - Fuel your body 2 to 3 hours before training and competitions. Consume high-energy foods like breads, cereals, pasta, rice, fruits, and vegetables. During activity, endurance athletes should consume between 30 and 60 grams of carbohydrate per hour to help fuel muscles and sustain your optimal performance.1

7. Consume the Right Amount of Carbohydrates During Competition - Research has shown that a 6% carbohydrate solution leaves the stomach as quickly as water.2 More concentrated levels of carbohydrate stay in the gut longer and may cause gastrointestinal distress during stop-and-go exercise. If consuming gels, bars or concentrates, be sure to drink plenty of water to dilute the carbohydrate level to about 6% (14 to 15 grams per 8 ounces).

8. Replace Sodium - Sodium is the most critical electrolyte to replace. Sodium intake helps the body “hold on” to more of the fluid consumed and may reduce the risk of heat illness, cramping and hyponatremia. During training and competition consider a sports drink with additional sodium like Gatorade Endurance Formula (200 mg of sodium per 8 ounces). If you notice your sweat stings your eyes, your skin feels gritty after exercise, or your clothing is caked with white residue, you may be a salty sweater and should consider adding salty foods like pretzels and chicken soup to your diet before and after the event.

9. Replace Weight Loss During Activity With Fluids - If you did lose weight during training or competition, make sure you gain the weight back before your next session. After exercise, drink approximately 20 to 24 ounces of fluid for each pound not replaced during training or competition.

10. Consume Protein Post-Exercise - Protein consumed during exercise may impede hydration and has no conclusive performance benefit. The best time to consume protein is post-exercise for muscle recovery.3

1. Sawka MN, et al. Med Sci Sports Exerc 39:377-390, 2007.
2. Shi X, et al. Med Sci Sports Exerc 27:1607-1615, 1995.
3. Levenhagen DK, et al. Med Sci Sports Exerc 34:828-837, 2002.

January 24th, 2008

by Lisa Sabin

How Much Protein Does An Athlete Need?

Protein has a variety of uses in the body. Minimal amounts of protein are utilized in aerobic exercise.  However protein is essential for repairing and rebuilding muscle tissue. It is also necessary for enzyme and hormone function and for the immune system.

Proteins are formed by linking amino acids. There are 10 essential amino acids for human beings. Protein is found in a variety of food sources. Protein from (meat, poultry, milk and fish) contain all the essential amino acids. Proteins from plant sources (corn, rice, and beans) do not contain all ten essential amino acids. Combinations of proteins from plant sources  provide complete proteins. One example of this is rice and beans.

Protein deficiency is not a huge problem in the United States. Most Americans consume more than enough protein for adequate health.  Athletes require more protein than those who are sedentary.

Protein Recommendations:

  • Sedentary - .8 grams per kg of body weight
  • Strength - 1.2 - 1.6 grams per kg of body weight
  • Endurance - 1.2 - 1.78 grams per kg of body weight

Amount in Common Foods:

  • Meat/Fish/Poultry - 7 grams per ounce
  • Dairy - 9 grams per cup
  • Bread - 3 grams per slice
  • Starchy Vegetables - 3 grams per 1/2 cup
  • Vegetables - 2 grams per 1/2 cup
  • Fruit - 0
  • Fats, Sweets, & Oils - 0

A diet consisting of at least 60-70% carbohydrates, 25-30% fat and 10-15% is recommended for endurance athletes (marathoners). Although protein doesn’t provide much energy for the athlete, it’s important for recovery and rebuilding muscle tissue. Combining complex carbohydrates, protein and unsaturated fats into each meal and snack provides satiety and lasting energy.

Sources: Miriam Nelson, PhD John Hancock Center For Physical Activity and Nutrition
Friedman School of Nutrition Science and Policy Tufts University

January 19th, 2008

by Lisa Sabin

Runners Don’t Forget The Carbs

Muscle glycogen is the primary fuel source for most sports!

  • Marathon - (65% VO2max) 60% Carbohydrate (CHO) 40% Fat
  • 10KRun - (85% VO2max) 75% CHO, 25% Fat

Marathoner’s Diet

  • CHO - 60-70% of cal (limited storage)
  • Fat - 25 -35% of cal (abundant storage)
  • Protein - 10 -18% of cal (need adequate amount - 1.2 g - 1.76 g per Kg of body weight)

Why Carbs?

  • Fuel for brain
  • Preserve proteins
  • Aid fat metabolism
  • Provide bulk and fiber

Back to back training days can deplete your glycogen (CHO) stores.  This could result in a decrease in performance.

  • High intensity aerobic exercise (1 hour) depletes > 50% of the liver glycogen
  • 2 1/2 hours depletes liver and muscles glycogen

CHO Recommendations:

Approximately 60 - 70% of daily caloric intake

  • 45 - 55% as complex CHO
  • 10 - 15% as refined CHO or simple sugars

Approximately 500 - 600 g CHO/day to replete glycogen stores

Needs based on training time

  • 1 hour/day - 6 g CHO/kg body weight
  • 2 hours/day - 8 g CHO/kg body weight
  • 3 hours or longer - up to 10 g CHO/kg body weight

Source:  Miriam Nelson, PhD, John Hancock Center for Physical Activity and Nutrition

Friedman School of Nutrition Science and Policy Tufts University