1. Restore Muscle Glycogen
When we exercise, especially if the workout is a HIIT workout or a high intensity resistance training workout, our body is using muscle glycogen for energy.
Let’s break down what muscle glycogen is.
Carbohydrates are what you eat.
Your body turns those carbs into glucose in the bloodstream.
Glucose in the bloodstream is what is readily available for your body to use for energy.
Whatever your body needs right now for energy, it will use in the form of that glucose, whatever excess glucose it doesn’t need will be stored in the muscles as muscle glycogen.
Once those muscle glycogen stores are filled up, the remaining excess glucose gets stored as fat.
When you begin to exercise, your body will convert the stored muscle glycogen back into glucose and bring it into the bloodstream to be used for energy.
Your body then uses the glucose in the bloodstream and the muscle glycogen to fuel you particularly for HIIT workouts or high intensity resistance training workouts.
After an intense workout, your muscle glycogen will be severely depleted. You’ll want to restore these muscle glycogen stores so that your muscles are able to recover and you’re able to have energy to carry out activities throughout the rest of your day - especially if you still have an active day ahead of you.
So, refueling your muscle with carbohydrates after your muscle glycogen stores have been depleted is key.
2. Induce Muscle Protein Synthesis
The second reason why post workout nutrition is important is to help prevent muscle breakdown and to increase muscle protein synthesis.
Resistance training is the act of damaging muscle fibers with the goal that it will provide the stimulus to grow the muscles back bigger and stronger.
Muscle protein synthesis - the process of producing new muscle protein - is induced with strength training, it’s induced with protein intake and with carbohydrate intake.
Muscle protein synthesis can occur if you do any of these individually but it’s optimized if you do them in tandem.
Optimizing the quality, the quantity, and the timing of your post workout nutrition assists in making that happen.