18. 06. 2013

What you eat is important.

However, when you eat it can be just as critical.

What is post-workout nutrition?

The basics:

  • The body deals with nutrients differently at different times, depending on activity.
  • What you consume before, during, and especially after your workout is important.
  • By consuming particular nutrients after your workout you improve your body composition, performance, and overall recovery.

Post-workout nutrition has three specific purposes:

  • Replenish glycogen
  • Decrease protein breakdown
  • Increase protein synthesis

In plain english:

  • Replenish their energy stores
  • Increase muscle size and/or muscle quality
  • Repair any damage caused by the workout

Benefits of good post-workout nutrition include:

  • Improved recovery
  • Increased ability to build muscle
  • Improved immune function
  • Improved bone mass
  • Improved ability to utilize body fat
  • Might decrease muscle soreness (There are not sufficient evidence to affirm this)

These benefits seem to work for everyone, regardless of gender or age.

 

Why are workout and post-workout nutrition so important?

When we work out intensely, we damage tissues at the micro level, and we use fuel.

This is what ultimately makes us stronger, leaner, fitter, and more muscular, but in the short term it requires repair.

Repair and rebuilding occurs through the breakdown of old, damaged proteins (protein breakdown) and the construction of new ones (protein synthesis) — a process known collectively as protein turnover.

Muscle protein synthesis is increased slightly (or unchanged) after resistance workouts, while protein breakdown increases dramatically. We’re doing a lot more breaking-down than building-up.

The relationship between these two parameters (rate of muscle protein synthesis and muscle protein breakdown) represents the metabolic basis for muscle growth (hypertrophy).

Muscle hypertrophy occurs when a positive protein balance can be established during recovery — in other words, when we make sure we have enough raw materials available for protein synthesis to occur, so that it doesn’t lag behind protein breakdown.

This is especially difficult with endurance athletes as protein synthesis drops and protein breakdown goes up.

Protein breakdown and synthesis

Studies show that this trend can be reversed – specifically, protein synthesis is stimulated and protein breakdown is suppressed when you consume the right type of nutrients after exercise.

Protein is not the only concern, however. During exercise sessions, stored carbohydrates can be substantially depleted.

Thus, during the post-workout period, we require protein and carbohydrates.

The raw materials we give our body through the consumption of food/supplements in the workout and post-workout periods are critical to creating the metabolic environment we desire.

 

What you should know about workout nutrition

AVAILABILITY

Availability strongly influences the amino acid/glucose delivery and transport.

In other words, in order for our bodies to use raw materials to rebuild and recover, those raw materials have to be available. And if they’re available, then our body is more likely to use them. Simply having the materials around can signal to our body that it’s time to rebuild.

We improve availability in two ways.

  • Increased blood flow to skeletal muscle during and after exercise means that more nutrients are floating around more quickly.
  • Providing an amino acid and glucose dense blood supply during and after exercise means that the rate of protein synthesis goes up.

Hence, we improve availability by having more blood circulating more rapidly, and by having more nutrients in that blood.

THE “WINDOW OF OPPORTUNITY”

Some refer to this workout and post-workout phenomenon as “the window of opportunity”.

During this window, your muscles are primed to accept nutrients that can stimulate muscle repair, muscle growth, and muscle strength.

This window opens immediately after your workout and starts to close pretty quickly. Research suggests that while protein synthesis persists for at least 48 hours after exercise, it’s most important to get postworkout nutrition immediately, and within 2 hours afterwards.

If you feed your body properly while this window is open, you’ll get the benefits.

If you don’t provide adequate post exercise nutrition fast enough — even if you delay by only a couple of hours — you decrease muscle glycogen storage and protein synthesis.

As soon as you drop that last dumbbell, you should be consuming some post-workout nutrition.

WHAT TO EAT

As we’ve mentioned, post-workout nutrition requires two nutrients:

  • Protein to aid in protein synthesis
  • Carbohydrates to help replace muscle glycogen (and to enhance the role of insulin in transporting nutrients into cells)

You could certainly eat a whole food meal that meets these requirements after exercise.

However, whole food meals aren’t always practical.

  • Some people aren’t hungry immediately after exercise.
  • Whole food digests slowly, and we want nutrients to be available quickly.
  • A whole food meal that requires refrigeration might be less practical.

On the other hand, consuming a liquid form of nutrition that contains rapidly digesting carbohydrates (e.g., maltodextrin, dextrose, glucose, etc) and proteins (e.g., protein hydrolysates or isolates:

  • Might accelerate recovery by utilizing insulin for nutrient transport into cells;
  • Can result in rapid digestion and absorption

Data indicate that it may only take about 20 grams of protein after a workout to maximally stimulate muscle protein synthesis.

We highly recommend 180 Natural Protein Super Food. It contains all the ingridient you need for post-workout nutrition, completly free of added sugar and additives. Click here to order your supply

WHICH WORKOUTS QUALIFY?

All workout perform with Workout Australia certainly do.

Save your workout drink for weight training, interval, and endurance training lasting 45 minutes or longer.

Casual exercise like walking the dog, moving cobblestones for grandpa, or riding your bike to the arcade doesn’t require a recovery drink.

 

Weight-loss and post-workout nutrition

When performing energy expenditure work to burn energy or lose fat, a recovery drink is not necessary. If you’re prioritizing fat loss, performance and recovery from these sessions are not as important as creating an energy deficit.

Still, if overall energy intake is low from food intake, and lots of time is being spent performing energy expenditure work, consuming a branched chain amino acid (BCAA) supplement might be helpful.

 

Summary and recommendations

Once your workout is complete, have a whole food meal within an hour or two.

With intense workouts/training, start by ingesting 30 grams of carbohydrate and 15 grams of protein (in 500 ml water) per hour of workout time.

You can sip this during the workout or consume it immediately after.

You can either make your own post-workout food / drink or find a pre-formulated drink that contains rapidly digesting carbohydrates (e.g., maltodextrin, dextrose, glucose, etc) and proteins (e.g., protein hydrolysates or isolates).

If priority #1 is to lose body fat, use only BCAAs as a workout drink. About 5 to 15 grams per hour of training (200 pounds or more = closer to 15 grams, 200 pounds or less = closer to 5 grams). If you’re leaner but still want to lose fat, choose a smaller dose (like 1/2 dose) of the protein + carb combination, or opt for BCAAs.

 

For extra credit

The combination of carbohydrate and amino acids during/after exercise creates a stimulatory effect of growth hormone and testosterone that doesn’t happen  during the rest of the day. In other words, if you just drink a carb + protein drink while sitting on the couch, it won’t have the same effect.

When choosing carbohydrates, keep in mind that glucose is absorbed faster than fructose, and solutions high in fructose have been linked to gastrointestinal distress, greater fatigue, and higher cortisol levels.

It may be helpful to add creatine to your workout nutrition.

Essential amino acids may be more important than nonessential for promoting positive nitrogen balance after workouts.

Thanks for reading! 

References

Volek JS & Rawson ES. Scientific basis and practical aspects of creatine supplementation for atheletes. Nutrition 2004;20:609-614.

Pitkanen H, et al. Free Amino Acid pool and Muscle Protein Balance after Resistance Exercise. Med Sci Sports Exerc 2003;35:784.

Chandler RM, et al. Dietary supplements affect the anabolic hormones after weight-training exercise. J Appl Physiol 1994;76:839.

Jentjens R & Jeukendrup A. Determinants of Post-Exercise Glycogen Synthesis during short term recovery. Sports Med 2003;33:117.

Levenhagen, et al. Postexercise nutrient intake timing in humans is critical to recovery of leg glucose and protein homeostasis. Am J Physiol Endocrinol Metab 2001;280:E982.

Tipton, et al. Timing of amino acid-carbohydrate ingestion alters anabolic response of muscle to resistance exercise. Am J Physiol Endocrinol Metab 2001;281:E197.

Van Loon, et al. Maximizing postexercise muscle glycogen synthesis: carbohydrate supplementation and the application of amino acid or protein hydrolysate mixtures. Am J Clin Nutr 2000;72:106.

Van Loon, et al. Ingestion of protein hydrolysate and amino acid-carbohydrate mixtures increases postexercise plasma insulin responses in men. J Nutr 2000;130:2508.

Borsheim E, et al. Essential amino acids and muscle protein recovery from resistance exercise. Am J Physiol Endocrinol Metab 2002;283:E648.

Bemben MG & Lamont HS. Creatine supplementation and exercise performance: recent findings. Sports Med 2005;35:107.

Moore DR, et al. Ingested protein dose response of muscle and albumin protein synthesis after resistance exercise in young men. Am J Clin Nutr 2009;89:161-168.

Symons TB, et al. A moderate serving of high-quality protein maximally stimulates skeletal muscle protein synthesis in young and elderly subjects. J Am Diet Assoc 2009;109:1582-1586.

Campos GE, et al. Muscular adaptations in response to three different resistance-training regimens: specificity of repetition maximum training zones. Eur J Appl Physiol 2002;88:50-60.

ADA, Dietitians of Canada, ACSM, et al. American College of Sports Medicine position stand. Nutritions and athletic performance. Med Sci Sports Exerc 2009;41:709-731.

Haub MD, et al. Effect of protein source on resistive-training-induced changes in body composition and muscle size in older men. Am J Clin Nutr 2002;76:511-517.

Tipton KD, et al. Stimulation of net muscle protein synthesis by whey protein ingestion before and after exercise. Am J Physiol Endocrinol Metab 2007;292:E71-E76.

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