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Tatyana · 30-07-2006, 04:01 AM

By Will Brink

Health-conscious people are told to avoid simple carbohydrates, and for good reasons. It’s not true all the time and in every situation, however. Following a heavy workout, there is a metabolic “window” - so to speak - where the body preferentially shuttles glucose into the liver and muscles to replace lost glycogen via both insulin-dependent and non-insulin-dependent transport mechanisms. Translated, this means your body will shuttle carbs and protein into the tissues you want (muscle) instead of storing them as fat after a workout.

To carry the analogy further, the metabolic window doesn’t stay open indefinitely, so you need to take advantage of the opportunity while it lasts.

A number of studies have found that a post-workout drink containing simple, high-GI carbs and protein increases protein synthesis dramatically. The two work synergistically to create an anabolic environment that’s superior to either nutrient alone. In addition, some recent work suggests that a pre-workout drink may be superior to a post-workout drink, and consuming both may be best of all!

Research looking at the issue has gotten a great deal of attention in the sports nutrition world. One particularly interesting study, “Timing of amino acid-carbohydrate ingestion alters anabolic response of muscle to resistance exercise.” (Am J Physiol Endocrinol Metab 2001 Aug;281(2):E197-206), compared the anabolic responses to a carbohydrate and amino acid supplement taken either before or after resistance exercise. It’s counterintuitive to think taking in these nutrients before the workout is superior to post-workout, but according to this small study:
“…results indicate that the response of net muscle protein synthesis to consumption of an EAC solution [carb/amino acid drink] immediately before resistance exercise is greater than that when the solution is consumed after exercise, primarily because of an increase in muscle protein synthesis...”
Since this study was published, several researchers have proposed that providing amino acids/protein and carbs both before and after a resistance workout represents the best of both worlds. This is the premise of the book “Nutrient Timing” by John Ivy and Robert Portman. They present compelling evidence that the right mixture of nutrients, taken at key points in the muscle growth cycle, will optimize improvements in muscle growth, strength, and power, as well as enhance recovery from exercise.

30-07-2006, 04:01 AM	#155 (permalink)
Tatyana My name is EARL Join Date: Jan 2006 Location: On my bloody bike doing cardio Posts: 3,427	This is why I thought blueberries were cool By Will Brink Health-conscious people are told to avoid simple carbohydrates, and for good reasons. It’s not true all the time and in every situation, however. Following a heavy workout, there is a metabolic “window” - so to speak - where the body preferentially shuttles glucose into the liver and muscles to replace lost glycogen via both insulin-dependent and non-insulin-dependent transport mechanisms. Translated, this means your body will shuttle carbs and protein into the tissues you want (muscle) instead of storing them as fat after a workout. To carry the analogy further, the metabolic window doesn’t stay open indefinitely, so you need to take advantage of the opportunity while it lasts. A number of studies have found that a post-workout drink containing simple, high-GI carbs and protein increases protein synthesis dramatically. The two work synergistically to create an anabolic environment that’s superior to either nutrient alone. In addition, some recent work suggests that a pre-workout drink may be superior to a post-workout drink, and consuming both may be best of all! Research looking at the issue has gotten a great deal of attention in the sports nutrition world. One particularly interesting study, “Timing of amino acid-carbohydrate ingestion alters anabolic response of muscle to resistance exercise.” (Am J Physiol Endocrinol Metab 2001 Aug;281(2):E197-206), compared the anabolic responses to a carbohydrate and amino acid supplement taken either before or after resistance exercise. It’s counterintuitive to think taking in these nutrients before the workout is superior to post-workout, but according to this small study: “…results indicate that the response of net muscle protein synthesis to consumption of an EAC solution [carb/amino acid drink] immediately before resistance exercise is greater than that when the solution is consumed after exercise, primarily because of an increase in muscle protein synthesis...” Since this study was published, several researchers have proposed that providing amino acids/protein and carbs both before and after a resistance workout represents the best of both worlds. This is the premise of the book “Nutrient Timing” by John Ivy and Robert Portman. They present compelling evidence that the right mixture of nutrients, taken at key points in the muscle growth cycle, will optimize improvements in muscle growth, strength, and power, as well as enhance recovery from exercise.