Hormones, Muscles, and T Cells: Why Recovery Nutrition is Important

Most of you know that you need some kind of recovery drink or snack after a hard workout. However, you may not know why it’s necessary and/or what to eat or drink.
To better understand the need for recovery nutrition, let’s take a look at three things that occur inside your body during vigorous exercise:

Hormones gone wild– During high intensity exercise, levels of cortisol, epinephrine, norepinephrine, and glucagon surge in a grand effort to supply energy to the working muscle. As blood glucose levels drop, these hormones work together to stimulate glucose production by the liver. Cortisol levels, in particular, stay elevated for 30 to 60 minutes after we stop exercising and continue to catabolize protein and carbs even though we no longer need them for energy. Consuming a recovery drink or snack during this period of time will lessen the degree of protein degradation and depletion of glycogen stores.

Fire in the muscle – During a hard run or ride, our muscles utilize three “branched-chain amino acids” (BCAA’s) to off-set the protein degradation and damage that naturally occurs with hard exercise. These BCAA’s are broken down in the muscle cell and used to generate ATP, which unbeknownst to most people, continues after exercise stops. To keep your body from having to breakdown more protein to get BCAA’s, you need to take in some “exogenous” protein in the form of food or beverage (aka recovery snack).

T-Cell Turmoil – Ever run a marathon and then gotten sick afterwards?  That’s because all that running (or any kind of hard exercise) temporarily lowers immune function which increases your susceptibility to infections. This occurs because cortisol and epinephrine suppress type 1 T-cell cytokine production which is vital for a strong immune system. Lowered immune function has been reported in exercise that lasts longer than 1.5 hours that is performed without nutritional intake during and after the exercise bout.
So, what is a good recovery snack or beverage?  Anything with a 4:1 ratio of carbs to protein. The carbs will replace the glycogen you just used up and the protein will lessen the need for BCAA’s and help promote muscle synthesis.
Examples include:

• Cereal, milk, and fruit
• Bagel sandwich with lean meat or peanut butter
• Eggs and toast
• Chocolate milk
• Yogurt and fruit
•  

Keep in mind that recovery nutrition is important only after hard workouts; not an easy run or casual bike ride. The excess calories coupled with lower intensity exercise can potentially lead to weight gain.
Eat up and recover well!

Cindy Dallow, Ph.D, RD, t2coaching nutritionist. You can contact here cindydallow@comcast.com